Rear Differential - Honda Stream on RUSSIA: Новости - Rear Differential... · Rear...
Transcript of Rear Differential - Honda Stream on RUSSIA: Новости - Rear Differential... · Rear...
SJC8A000000000J1501ZCAT00
Rear Differential
Rear Differential................................................................
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Special Tools . 15-2Component Location Index . 15-3General Troubleshooting Information . 15-4DTC Troubleshooting Index . 15-10Symptom Troubleshooting Index . 15-11System Description . 15-12Circuit Diagram . 15-18DTC Troubleshooting . 15-20Symptom Troubleshooting . 15-41Rear Differential Fluid
Inspection and Replacement . 15-47Rear Differential Function Test . 15-48Rear Differential Fluid Temperature Sensor
Replacement . 15-49VTM-4 LOCK Switch Test/Replacement . 15-49VTM-4 Control Unit Replacement . 15-50VTM-4 Relay Replacement . 15-50Rear Differential Breather, Line, and Hose
Replacement . 15-51Rear Differential Mount Replacement . 15-52Rear Differential Removal . 15-53Backlash Inspection . 15-55Rear Differential Installation . 15-56
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0101
SJC8A000000000J1501PAAT00
Ref. No. Tool Number Description Qty
15-2
Rear Differential
Special Tools
07SAZ-001000A Backprobe Set 207AAD-S9VA000 Driveshaft Remover 1
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*01
SJC8A00E44381000000DAAT00
15-3
Component Location Index
VTM-4 LOCK SWITCH
REAR DIFFERENTIAL BREATHER LINE
VTM-4 LOCKINDICATOR
VTM-4 INDICATORVTM-4 CONTROL UNIT
REAR DIFFERENTIAL ASSEMBLY
VTM-4 RELAY
Test, page 15-49Replacement, page 15-49
Replacement, page 15-51
Replacement, page 15-50
Removal, page 15-53Installation, page 15-56
Test, page 22-75Replacement, page 15-50
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SJC8A00E44381000000BBAT00
VTM-4 Indicator
Diagnostic Trouble Code (DTC)
Self-diagnosis
15-4
Rear Differential
General Troubleshooting Information
The VTM-4 indicator comes on under certain conditions even if the 4WD system is working normally. Here are someexamples:
• When you use high-powered wireless equipment such as a CB or Ham radio in the vehicle.• When you keep spinning the front wheels while the vehicle is stuck in sand, mud, snow, etc.• When the battery voltage suddenly drops below 8 volts or rises above 16 volts.
After the VTM-4 indicator comes on, it stays on until you turn the ignition switch off.
• The VTM-4 control unit can memorize up to seven different DTCs. The system displays the DTCs by blinking theVTM-4 indicator. Multiple DTCs are displayed in the order they occured, beginning with the most recent.
• If the same DTC is detected more than once, the most recent DTC is written over the earlier one. Therefore, when thesame problem is detected more than once, it is memorized as a single DTC.
• The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs are not clearedwhen the battery is disconnected or the VTM-4 control unit is disconnected.
• If there is a problem in the central processing unit (CPU) of the VTM-4 control unit, the VTM-4 indicator comes on,but no DTC is memorized.
When a problem is detected by self-diagnosis, the system does the following:
• Turns the VTM-4 indicator on.• Memorizes the DTC.• Stops 4WD control and puts the vehicle back in 2WD (FWD).• Reduces engine torque to suit the driving conditions when the abnormality was detected.
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01 *01
Initialization of the VTM-4 Control Unit
Initialization with the HDS
Manual Initialization
15-5
A
VTM-4INDICATOR
VTM-4 LOCKINDICATOR
ON
OFF
Enginestart
VTM-4 LOCKswitch push
Enginestop
IG switchON (II)
4 sec
4 sec
ON
OFF
Whenever the VTM-4 control unit is replaced, it must beinitialized to make the 4WD system function.There are two methods used to initialize the VTM-4control unit. The recommended method is to use theHonda Diagnostic System (HDS) with the appropriatesoftware plugged into the data link connector (DLC).
The other method is to initialize the VTM-4 control unitmanually.
1. With the ignition switch OFF, connect the HDS tothe data link connector (DLC) (A) (located behindthe driver’s dashboard lower cover).
2. Make sure the HDS communicates with the VTM-4control unit. If it doesn’t go to the DLC circuittroubleshooting (see page 11-194).
3. Turn the ignition switch ON (II), and follow theprompts on the HDS screen.
NOTE: See the HDS user’s manual for specificinstruction.
1. Start the engine (the VTM-4 indicator comes on,and the VTM-4 LOCK switch indicator is off).
2. Apply the brakes, and move the shift lever to eitherR, 1, or 2, then push the VTM-4 LOCK switch (theVTM-4 indicator stays on, and the VTM-4 LOCKswitch indicator is on). The 4WD system is now inlock mode.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II) (the VTM-4 indicatorand the VTM-4 LOCK indicator both come on for4 seconds, then go off). The VTM-4 control unit isinitialized.
(cont’d)
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03
04
How to Check for DTCs
HDS Method
Service Check Signal Circuit (SCS) Method
15-6
Rear Differential
General Troubleshooting Information (cont’d)
A
A
When the VTM-4 control unit senses an abnormality inthe input or output systems, the VTM-4 indicator in thegauge control module will usually come on, and themalfunction indicator lamp (MIL), the D5 indicator, and/or the VSA indicator may also come on.There are two methods used to check for DTCs. Therecommended method is to use the HDS with theappropriate software plugged into the data linkconnector (DLC).
The other method is to connect the service check signal(SCS) circuit with the HDS. When the data linkconnector (DLC) is connected to the HDS, the VTM-4indicator will blink the diagnostic trouble code (DTC)when the ignition switch is turned ON (II) and the SCScircuit is connected to body ground.
1. With the ignition switch OFF, connect the HDS tothe data link connector (DLC) (A) (located behindthe driver’s dashboard lower cover).
2. Make sure the HDS communicates with the VTM-4control unit. If it doesn’t go to the DLC circuittroubleshooting (see page 11-194).
3. Turn the ignition switch ON (II), and follow theprompts on the HDS to display the DTC(s) on thescreen. After determining the DTC(s), refer to theDTC Troubleshooting.
NOTE: See the HDS user’s manual for specificinstruction.
4. If there are fuel and emissions DTCs, A/T DTCs, orVSA DTCs at the same time, troubleshoot the fueland emissions DTCs first, then A/T DTCs second,then VSA third, and then VTM-4 last.
5. After recording the DTCs, clear all DTCs.
6. Test-drive the vehicle for several minutes in 4WDmode, and check for DTCs. If the DTC returns, referto the DTC Troubleshooting. If the DTC does notreturn, there was an intermittent problem withinthe circuit. Make sure all connectors and terminalsin the circuit are tight.
1. Park the vehicle on level ground. Shift to P, thenturn off the engine.
2. Release the parking brake pedal.
3. With the ignition switch OFF, connect the HDS tothe data link connector (DLC) (A) (located behindthe driver’s dashboard lower cover).
4. Short the SCS circuit to body ground with the HDS.
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05
06
How to Troubleshoot Circuits at the VTM-4Control Unit
Special Tools Required
15-7
Long blinks Short blinks
(2) (4)
OFF
See DTC 24
A07SAZ-001000A
B07SAZ-001000A
C
5. Turn the ignition switch ON (II), and observe theVTM-4 indicator.
NOTE: Codes above 10 are indicated by a series oflong and short blinks. One long blink equals 10short blinks. Add the long and short blinks togetherto determine the code. After determining the code,refer to the DTC Troubleshooting.
6. Record all the DTC(s), then refer to the DTCTroubleshooting to determine the meaning of eachDTC.
7. Clear the DTCs from the VTM-4 control unitmemory.
8. If the MIL, D5 indicator, or the VSA indicator allcome on at the same time, troubleshoot the causefor the MIL first, then A/T DTCs second, then VSAthird, and then VTM-4 last.
9. Test-drive the vehicle for several minutes in 4WDmode, and check for DTCs.If the DTC returns, refer to the DTC Troubleshooting.If the DTC does not return, there was anintermittent problem within the circuit. Make sureall connectors and terminals in the circuit are tight.
Backprobe set 07SAZ-001000A (two required)
1.
2. Inspect the circuit on the VTM-4 control unitaccording to the DTC Troubleshooting using thespecial tools and a digital multimeter or an analogcircuit tester.
3. Connect the backprobe adapters (A) to the stackingpatch cords (B), and connect the cords to themultimeter or an analog circuit tester (C). Using thewire insulator as a guide for the contoured-tip ofthe backprobe adapter, gently slide the tip into theconnector from the wire side until it comes incontact with the terminal end of the wires.
(cont’d)
07/05/09 16:43:12 61SJC020_150_0007
Remove the right side kick panel (see page 20-60)to gain access tothe VTM-4 control unit.
07
08
How to Clear the VTM-4 Control UnitMemory
HDS method
Service Check Signal Circuit (SCS) Method
15-8
Rear Differential
General Troubleshooting Information (cont’d)
A
A
There are two methods used to clear DTCs from theVTM-4 control unit memory. The recommendedmethod is to use the HDS with the appropriate softwareplugged into the data link connector (DLC).
The other method is to connect the service check signal(SCS) connector with the HDS, and manually clear thememory.
1. With the ignition switch OFF, connect the HDS tothe data link connector (DLC) (A) (located behindthe driver’s dashboard lower cover).
2. Make sure the HDS communicates with the VTM-4control unit. If it doesn’t go to the DLC circuittroubleshooting (see page 11-194).
3. Turn the ignition switch ON (II), and follow theprompts on the HDS screen to clear the DTC(s).
NOTE: See the HDS user’s manual for specificinstruction.
1. Park the vehicle on level ground. Shift to P, thenturn off the engine.
2. Release the parking brake pedal.
3. With the ignition switch OFF, connect the HDS tothe data link connector (DLC) (A) (located behindthe driver’s dashboard lower cover).
4. Short the SCS circuit to body ground with the HDS.
5. Turn the ignition switch ON (II).
6. The VTM-4 indicator comes on and stays on for4 seconds. Press and hold the VTM-4 LOCK swtichwhile the VTM-4 indicator is on.
7. When the VTM-4 indicator goes off, release theVTM-4 LOCK switch.
8. The VTM-4 indicator comes on and stays on for4 seconds. Press and hold the VTM-4 LOCK switchwhile the VTM-4 indicator is on.
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*02
How to End a Troubleshooting Session(required after any troubleshooting)
15-9
IGNITIONSWITCH
PARKING BRAKESWITCH
PGM TESTERCONNECT
VTM-4INDICATOR
VTM-4 LOCKINDICATOR
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
IG switch ON (II)
4 sec 4 sec 0.3 sec 0.3 sec
0.3 sec
VTM-4 LOCKswitch pushed
VTM-4 LOCKswitch released
VTM-4 LOCKswitch pushed
VTM-4 LOCKswitch released
9. When the VTM-4 indicator goes off, release theVTM-4 LOCK switch. The VTM-4 indicator will blinktwice quickly to confirm that the DTCs have beencleared from the VTM-4 control unit memory.
NOTE: If the VTM-4 indicator does not blink twicequickly, the memory has not been cleared. Turn theignition switch OFF, then repeat steps 5 through 9.
10. Turn the ignition switch OFF, then disconnect theHDS from the data link connector (DLC).
1. Turn the ignition switch OFF.
2. Clear the DTCs from the VTM-4 control unitmemory.
3. Disconnect the HDS from the data link connector(DLC).
4. Verify that the problem has been repaired; test-drive the vehicle for several minutes in 4WD mode.
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SJC8A00E44381000000GAAT00
DTC VTM-4Indicator
Detection Item Possible Cause Page
15-10
Rear Differential
DTC Troubleshooting Index
•••••
••••
•
•••••••••
•••
••••
•••••••
••••••••••
21-1 ON Left-front wheel sensor Sensor is defectiveOpen or short in the wire harnessVTM-4 control unit is defectiveVSA modulator-control unit is defective
(see page 15-20)22-1 ON Right-front wheel sensor23-1 ON Left-rear wheel sensor (see page 15-22)24-1 ON Right-rear wheel sensor26-1 ON VSA modulator-control unit or wire
harnessOpen or short in the wire harness from theVTM-4 control unit to VSA modulatorVSA modulator-control unit is defective
(see page 15-24)
37-1 ON Engine RPM signal circuit Open or short in the wire harnessVTM-4 control unit or PCM is defective
(see page 15-25)38-1 ON41-1 ON CAN communication (PCM/VSA system) Open or short in the wire harness from the
VTM-4 control unit to PCM/VSAVTM-4 control unit or PCM is defective orVSA modulator-control unit is defective
(see page 15-27)
42-1 ON Differential oil temperature sensor Sensor is defectiveOpen or short in the wire harnessVTM-4 control unit is defective
(see page 15-29)43-1 ON
44-1 ON VTM-4 relay Relay is defectiveOpen or short in the wire harnessVTM-4 control unit is defective
(see page 15-30)
51-1 ON Left clutch electromagnetic coil Electromagnetic coil is defectiveOpen or short in the wire harnessVTM-4 control unit is defective
(see page 15-32)52-1 ON53-1 ON54-1 ON55-1 ON Right clutch electromagnetic coil Electromagnetic coil is defective
Open or short in the wire harnessVTM-4 control unit is defective
(see page 15-34)56-1 ON57-1 ON58-1 ON59-1 ON Right/left clutch electromagnetic coil
power supplyLow battery voltageFault in the charging systemVTM-4 control unit is defective
(see page 15-37)
73-1 ON MAP (manifold absolute pressure)sensor or PCM
Fault in the PCM system/MAP (manifoldabsolute pressure) sensor is defective
(see page 15-37)
76-1 ON Rear differential clutch warning system Sensor is defectiveOpen or short in the wire harnessVTM-4 control unit is defectiveVSA modulator-control unit is defective
(see page 15-38)
77-1 ON PCM PCM is defective (see page 15-40)78-1 ON VTM-4 control unit VTM-4 control unit is defective (see page 15-40)41-2 ON CAN communication (PCM/VSA system) Open or short in the wire harness from
VTM-4 control unit to PCM (or VSA)(see page 15-27)
42-2 ON Differential oil temperature sensor Sensor is defectiveOpen or short in the wire harnessVTM-4 control unit is defective
(see page 15-29)
21-2 ON Left-front wheel sensor Sensor is defectiveOpen or short in the wire harnessVTM-4 control unit is defectiveVSA modulator-control unit is defective
(see page 15-20)22-2 ON Right-front wheel sensor23-2 ON Left-rear wheel sensor (see page 15-22)24-2 ON Right-rear wheel sensor53-2 ON Left or Right clutch electromagnetic coil Electromagnetic coil is defective
Open or short in the wire harnessVTM-4 control unit is defective
(see page 15-32)(see page 15-34)
: DTCs are indicated by the VTM-4 indicator when the data link connector (DLC) is connected to the HDS.
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Symptom Diagnostic Procedure Also check for
15-11
Symptom Troubleshooting Index
The VTM-4 indicatorcomes on, but no DTCsare stored in any system:VTM-4, VSA, or PCM
Symptom troubleshooting (see page 15-41).
The VTM-4 indicator doesnot come on
Symptom troubleshooting (see page 15-42).
The VTM-4 LOCKindicator does not comeon when the VTM-4 LOCKswitch is pressed
Symptom troubleshooting (see page 15-43).
The VTM-4 LOCKindicator comes on whenthe ignition switch isturned ON (II) and doesnot go off
Symptom troubleshooting (see page 15-45).
The VTM-4 LOCKindicator does not comeon for about 4 secondswhen the ignition switchis turned ON (II)
Symptom troubleshooting (see page 15-46).
Noise and judder whenturning at full lock
1.
2.3.4.
Drain and refill the rear differential with new VTM-4 fluid(see page 15-47).Do the Differential Function Test (see page 15-48).Repeat steps 1 and 2.Drain the rear differential, then install new drain plugwashers, and refill with new VTM-4 fluid (see page 15-47).
Clunk noise and then abump when backing andturning
Normal clutch engagement at throttle opening
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*01
SJC8A00E44381000000CAAT00
15-12
Rear Differential
System Description
VTM-4LOCKSWITCH
VTM-4 SYSTEM
VTM-4CONTROLUNIT
REAR DIFFERENTIALASSEMBLY
PCM
VSAMODULATOR-CONTROL UNIT
Oil temperaturesensor signal
Right wheelcontrol current
Left wheelcontrol current
This vehicle is equipped with a rear differential system called the variable torque management 4WD (VTM-4) system.The VTM-4 control unit controls the current flowing through electromagnetic coils to engage and disengage the rightand left clutches in the rear differential assembly.The operation of the VTM-4 system consists of the following functions:
• Vehicle acceleration torque control (VATC)• Limited slip differential (LSD)• Lock control
These functions automatically combine to distribute driving torque between the front and rear wheels when thevehicle is being accelerated or when wheels are slipping. When the vehicle speed is about 18 mph (30 km/h) or below,and the transmission is in R, 2, or 1, the system will manually engage the rear differential clutches when the VTM-4LOCK switch is pressed. By design, in lock mode, the torque is reduced gradually at speeds above 6 mph (10 km/h) tominimize the load on the 4WD system.The VTM-4 control unit has a fail-safe function, a self-diagnosis function, and a provision to communicate with theHDS.
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02
03
04
15-13
Amount of controlN·m (kgf·m)
Deceleration0
Acceleration
Acceleration of vehicle(calculation from driving torque)
Amount of controlN·m (kgf·m)
0Front wheelrotation small
Front wheelrotation large
Rotation difference betweenfront wheel and rear wheel
100
6
Amount of control(%)
Velocity of vehicle(mph)
• VATC ControlThe torque to be delivered to the rear wheels is calculated based on the acceleration of the vehicle calculated in theVTM-4 control unit.
• LSD ControlThe torque to be delivered to the rear wheels is calculated based on the differences in speed and accelerationbetween the front and rear wheels.
• LOCK ControlRear differential clutch lock control is done by pushing the VTM-4 LOCK switch manually when the shift lever is inR, 1, or 2.
(cont’d)
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*02
-
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--
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Electronic Control System
VTM-4 Control Unit Electrical Connections
15-14
Rear Differential
System Description (cont’d)
VTM 4LOCK SWITCH
A8LOCKSW
REAR DIFFERENTIAL
IGNITION SWITCH
VTM 4 LOCK INDICATOR
VTM 4 INDICATOR
B5PG
A18K LINE
SCSA20
A11CANH
CANLA22
NEPA12
PARKING BRAKE SWITCH
A5RLP
RRPA3
A7FRP
A1
A4
VTM 4 RELAY
IG1
TOLA13
A15TOH
PWRB7
A16PARBRK
B12LG2
LG1A10
LOCKLA16
LCOLB2
RCOLB4
B11WARN2
FLPA9
WARN1A14
VTM 4 CONTROL UNIT
IG1
FSR
B1
B3
LCOH
RCOH
BATTERY
IG1 HOT in ON (II) andSTART (III)
RIGHT CLUTCHELECTROMAGNETICCOIL
LEFT CLUTCHELECTROMAGNETICCOIL
DIFFERENTIALOILTEMPERATURESENSOR
VSAMODULATORCONTROLUNIT
POWERTRAINCONTROLMODULE(PCM)
DATA LINKCONNECTOR
GAUGE CONTROLMODULE
07/05/09 16:43:14 61SJC020_150_0014
-
-
-
-
06
VTM-4 Control Unit Inputs and Outputs
Terminal
number
Wire color Terminal sign
(Terminal name)
Description Measurement
Conditions Voltage
15-15
VTM-4 Control Unit Connector Terminal Locations
B (12P) A (22P)
The VTM-4 control unit terminal voltage and measuring conditions for the 4WD control system are shown.
NOTE: Measure voltage with the connectors connected.
A1 YEL IG1 (Ignition 1) Power supply foractivating the system
Ignition switchON (II)
Battery voltage
A3 GRY/RED RRP (Rear rightpulse)
Detect right-rear wheelsensor signal
Turn wheel at 1rotation/second
A4 ORN/GRN FSR (Fail-saferelay)
Drives VTM-4 relay Ignition switchON (II)
Battery voltage
Engine running Less than 1 VA5 GRY/YEL RLP (Rear left
pulse)Detects left-rear wheelsensor signal
Turn wheel at 1rotation/second
A6 GRN/ORN PARBRK (Parkingbrake)
Detects parking brakesignal
Parking brake on Less than 2 VParking brake off Battery voltage
A7 LT GRN FRP (Front rightpulse)
Detects right-frontwheel sensor signal
Turn wheel at 1rotation/second
A8 BRN/WHT LOCKSW (LOCKswitch)
Detects VTM-4 LOCKswitch signal
Ignition switchON (II)
Less than 1 V
VTM-4 LOCK mode Battery voltageA9 WHT/RED FLP (Front left
pulse)Detects left-front wheelsensor signal
Turn wheel at 1rotation/second
(cont’d)
There should be 0about 5 V repeatedly.(A digital voltmeterreads about 2.5 V whenthe wheel is turningfaster.)
There should be 0about 5 V repeatedly.(A digital voltmeterreads about 2.5 V whenthe wheel is turningfaster.)
There should be 0about 5 V repeatedly.(A digital voltmeterreads about 2.5 V whenthe wheel is turningfaster.)
There should be 0about 5 V repeatedly.(A digital voltmeterreads about 2.5 V whenthe wheel is turningfaster.)
Wire side of female terminals
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-
-
07
VTM-4 Control Unit Inputs and Outputs
Terminal
number
Wire color Terminal sign
(Terminal name)
Description Measurement
Conditions Voltage
15-16
Rear Differential
System Description (cont’d)
VTM-4 Control Unit Connector Terminal Locations
B (12P) A (22P)
The VTM-4 control unit terminal voltage and measuring conditions for the 4WD control system are shown.
NOTE: Measure voltage with the connectors connected.
A10 BLK LG1 (Logic ground) Ground Less than 0.5 VA11 WHT CANH
(CANcommunicationsignal high)
CAN communicationsignal
Ignition switchON (II)
About 2.5 V (pulses)
A12 BLU NEP(Engine revolution)
Detects enginerevolution signal
Ignition switchON (II)
Above 8 V
Engine running at1,000 rpm
5 8 V
A13 BLK TOL(Temperature oillow)
Detects differential oiltemperature sensorsignal
Check at normaltemperature withthe ignition switchON (II)
1 3.6 V
A14 RED/WHT WARN1 (Warning1)
Drives VTM-4 indicator VTM-4 indicator on Less than 4 VVTM-4 indicator off Battery voltage
A15 WHT TOH(Temperature oilhigh)
Power supply fordifferential oiltemperature sensor
Check at normaltemperature withthe ignition switchON (II)
4 5 V
A16 YEL/BLK LOCKL (Lock lamp) Drives VTM-4 LOCKindicator
VTM-4 LOCKindicator on
Less than 4 V
VTM-4 LOCKindicator off
Battery voltage
A18 LT BLU K-LINE Communication signalto HDS
Ignition switchON (II) (Notconnected to HDS)
About 9.0 V
A20 BRN SCS(Service checksignal)
Detects service checkconnector signal
SCS circuit shorted Less than 2 VSCS circuit opened About 5 V
A22 RED CANL(CANcommunicationsignal low)
CAN communicationsignal
Ignition switchON (II)
About 2.5 V (pulses)
Wire side of female terminals
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Terminal
number
Wire color Terminal sign
(Terminal name)
Description Measurement
Conditions Voltage
15-17
B1 BLK/RED LCOH (Left coilhigh)
Drives left clutchelectromagnetic coil(positive)
Ignition switchON (II)
Less than 1 V
Engine running Less than 1 VVTM-4 LOCK mode Above 3 V
B2 BLK/WHT LCOL (Left coillow)
Drives left clutchelectromagnetic coil(negative)
Ignition switchON (II)
Less than 1 V
Engine running Less than 1 VVTM-4 LOCK mode Less than 1 V
B3 BRN RCOH (Right coilhigh)
Drives right clutchelectromagnetic coil(positive)
Ignition switchON (II)
Less than 1 V
Engine running Less than 1 VVTM-4 LOCK mode Above 3 V
B4 GRN RCOL (Right coillow)
Drives right clutchelectromagnetic coil(negative)
Ignition switchON (II)
Less than 1 V
Engine running Less than 1 VVTM-4 LOCK mode Less than 1 V
B5 BLK PG (Power ground) Ground Less than 0.5 VB7 RED/BLU PWR (Power) Power supply for
VTM-4 control unit10 seconds afterignition switchON (II)
Less than 3 V
Engine running Battery voltageVTM-4 LOCK mode Battery voltage
B11 RED/WHT WARN2 (Warning2)
Drives VTM-4 indicator VTM-4 indicator on Less than 4 VVTM-4 indicator off Battery voltage
B12 BLK LG2 (Logic ground) Ground Less than 0.5 V
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*90
SJC8A00E44381000000EAAT00
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-
-
-
-
-
15-18
Rear Differential
Circuit Diagram
A6G1 BAT
YEL
YEL
LIGHTINDICATOR
GAUGE CONTROL MODULE
RED
C3
(20 A)No.4
No.21 (7.5 A)
VTM 4 CONTROL UNIT
RED/BLK
YEL
RED/WHT
VTM 4 LOCK SWITCH 42
1 35
YEL
IG1
IGNITION SWITCH
BRN/WHTYEL/BLKRED/WHT
A14
WARN1
A8
LOCKSW
A16
LOCKH
PWR
B7A4
FSR
A1
IG1
RED/WHT
WARN2
B11
ORN/GRN RED/BLU
3 2
15
BLK/YEL WHT/RED
No.23 (IG) (50 A)
BATTERY
UNDER HOOD FUSE/RELAY BOX
No.22 (BAT) (120 A) No.18 (15 A)
UNDER DASHFUSE/RELAY BOX
IG1 HOT in ON (II) andSTART (III)
VTM 4RELAY
VTM 4INDICATOR
TAILLIGHTRELAY
DASH LIGHTSBRIGHTNESSCONTROLLER(In the gaugecontrol module)
AUXILIALYUNDER HOODFUSE BOX
D1
N44
A
A
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*90
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15-19
GRN/ORN
GRN/ORN
G601
GRNBRN WHT BLKBLK/WHTBLK/RED
3712
RED WHT
PG
B5
BLK
4
BLK
BRN/BLK
REAR DIFFERENTIAL
LCOL
B2
LCOH
B1
1 2
BLK/RED BLK/WHT
A18
K LINE
LT BLU
SCS
A20
BRN
9 7
DATA LINK CONNECTOR
A1A28
: Shielding
G501
262875
VSA MODULATOR CONTROL UNIT
WHT/REDLT GRNGRY/RED GRY/YEL
A5
RLP
A3
RRP FRP
A7
FLP
A9
RED
BLU
WHT
A36
WHTRED
TOL
A13
TOH
A15
52
BLKWHT
6 3
BRN GRN
RCOL
B4
RCOH
B3
GRN/ORN
BRN/YELBLK
B12
LG
A10
LG
PARBRK
A6
A11
CANHCANL
A22A12
NEP
RIGHT CLUTCHELECTROMAGNETICCOIL
DIFFERENTIAL OILTEMPERATURESENSOR
POWERTRAIN CONTROLMODULE (PCM)
MULTIPLEXINTEGRATEDCONTROLUNIT (MICU)
PARKINGBRAKESWITCH
VTM 4CONTROLUNIT
LEFT CLUTCHELECTROMAGNETICCOIL
07/05/09 16:43:16 61SJC020_150_0019
01
SJC8A00K80200081211FAAT01
-
-
-
-
-
-
-
-
DTC 21-1, 21-2, 22-1, 22-2:
YES
NO
YES
NO
YES
NO
YES
NO
15-20
Rear Differential
DTC Troubleshooting
VTM-4 CONTROL UNIT CONNECTOR A (22P)
FLP (WHT/RED)FRP (LT GRN)
Front WheelSensors
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check for DTCs in the VSA system with the HDS.
Go to the indicated DTCs troubleshooting.
Go to step 5.
5. Turn the ignition switch OFF.
6. Raise the vehicle, and make sure it is securelysupported.
7. Spin the rear wheels by hand, and check for rearbrake drag.
Repair cause of rear brake drag, and retest.
Go to step 8.
8. Turn the ignition switch ON (II).
9. Measure voltage between the No. 7 and No. 9terminals of the VTM-4 control unit connector A(22P) and body ground while rotating theappropriate wheel (1 rotation/second).
DTC Appropriate Terminal21 (Left-front) A922 (Right-front) A7
Go to step 16.
Go to step 10.
10. Turn the ignition switch OFF.
11. Disconnect the VTM-4 control unit connector A(22P) and the VSA modulator-control unit 46Pconnector.
Wire side of female terminals
Is DTC 21-1, 21-2, and/ or 21-2 indicated?
Are there any VSA DTCs indicated?
Are the rear brakes dragging?
Is there about 2 V to 3 V?
07/05/09 16:43:16 61SJC020_150_0020
02
03
04
-
--
-
-
-
YES
NO
YES
NO
YES
NO
15-21
VTM-4 CONTROL UNIT CONNECTOR A (22P)
FLP (WHT/RED)FRP (LT GRN)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
FLP (WHT/RED)FRP (LT GRN)
JUMPER WIRE JUMPER WIRE
VSA MODULATOR-CONTROL UNIT 46P CONNECTOR
FRP (LT GRN)FLP (WHT/RED)
12. Check for continuity between the terminals No. 7and No. 9 of VTM-4 control unit connector A (22P)and body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A7 and/or A9) and the VSAmodulator-control unit.
Go to step 13.
13. Connect the terminals No. 7 and No. 9 of VTM-4control unit connector A (22P) to body ground withthe jumper wires.
14. Disconnect the VSA modulator-control unit 46Pconnector.
15. Check for continuity between the VSA modulator-control unit 46P connector terminals and bodyground.
Appropriatewheel
Appropriate TerminalVSA modulator-control unit
Right-front 28Left-front 26
Go to step 16.
Repair open in the wire between the VTM-4control unit (A7 and/or A9) and the VSA modulator-control unit.
16. Check for poor connections or loose terminals atthe VTM-4 control unit and the VSA modulator-control unit connectors. If the connections are OK,replace the VTM-4 control unit, then go to step 17.
17. Test-drive the vehicle, and check for DTCs with theHDS.
Replace the VSA modulator-control unit(see page 19-94).
The system is OK at this time.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity?
Is DTCs 21-1, 21-2, and/ or 22-2 indicated?
07/05/09 16:43:51 61SJC020_150_0021
01
SJC8A00K80200081231FAAT01
-
-
-
-
-
-
-
-
DTC 23-1, 23-2, 24-1, 24-2:
YES
NO
YES
NO
YES
NO
YES
NO
15-22
Rear Differential
DTC Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
Rear WheelSensors
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Start the engine, shift the transmission into D. Test-drive the vehicle at speeds over 25 mph (40 km/h),while keeping the engine speed below 2,500 rpmfor at least 30 seconds.
NOTE: Be careful not to overheat the reardifferential clutch system.
4. Check for DTSs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at thistime.
5. Check for DTCs in the VSA system with the HDS.
Go to the indicated DTCs troubleshooting.
Go to step 6.
6. Turn the ignition switch OFF.
7. Raise the vehicle, and make sure it is securelysupported.
8. Spin the rear wheels by hand, and check for rearbrake drag.
Repair cause of rear brake drag, and retest.
Go to step 9.
9. Turn the ignition switch ON (II).
10. Measure voltage between the No. 3 and No. 5terminals of the VTM-4 control unit connector A(22P) and body ground while rotating theappropriate wheel (1 rotation/second).
DTC Appropriate Terminal23 (Left-rear) A524 (Right-rear) A3
Go to step 18.
Go to step 11.
11. Turn the ignition switch OFF.
12. Disconnect the VTM-4 control unit connector A(22P) and the VSA modulator-control unit 46Pconnector.
Wire side of female terminalsIs DTCs 23-1, 23-2, 24-1, and/ or 24-2 indicated?
Are there any VSA DTCs indicated?
Are the rear brakes dragging?
Is there about 2 V to 3 V?
07/05/09 16:43:51 61SJC020_150_0022
02
03
04
-
--
-
-
-
YES
NO
YES
NO
YES
NO
15-23
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
JUMPER WIRE JUMPER WIRE
RLP (GRY/YEL) RRP (GRY/RED)
VSA MODULATOR-CONTROL UNIT 46P CONNECTOR
13. Check for continuity between the same terminal ofVTM-4 control unit connector A (22P) and bodyground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A3 and/or A5) and the VSAmodulator-control unit.
Go to step 14.
14. Connect the terminals No. 3 and No. 5 of VTM-4control unit connector A (22P) to body ground withthe jumper wires.
15. Disconnect the VSA modulator-control unit 46Pconnector.
16. Check for continuity between the VSA modulator-control unit 46P connector terminals and bodyground.
Appropriatewheel
Appropriate TerminalVSA modulator-control unit
Right-rear 5Left-rear 7
Go to step 17.
Repair open in the wire between the VTM-4control unit (A3 and/or A5) and the VSA modulator-control unit.
17. Check for poor connection or loose terminals at theVTM-4 control unit and the VSA modulator-controlunit connectors. If the connections are OK, replacethe VTM-4 control unit, then go to step 18.
18. Start the engine, shift the transmission into D. Test-drive the vehicle at speeds over 25 mph (40 km/h),while keeping the engine speed below 2,500 rpmfor at least 30 seconds.
NOTE: Be careful not to overheat the reardifferential clutch system.
19. Check for DTCs with the HDS.
Replace the VSA modulator-control unit(see page 19-94).
The system is OK at this time.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity?
Is DTCs 23-1, 23-2, 24-1, and/ or 24-2 indicated?
07/05/09 16:43:51 61SJC020_150_0023
01
SJC8A00K80200081261FAAT00
-
-
-
--
-
DTC 26-1:
YES
NO
YES
NO
YES
NO
15-24
Rear Differential
DTC Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RRP (GRY/RED) FLP (WHT/RED)
RLP(GRY/YEL)
FRP(LT GRN)
VSA Modulator-Control Unit orWire Harness
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check for DTCs in the VSA system with the HDS.
Go to the indicated DTCs troubleshooting.
Go to step 5.
5. Turn the ignition switch OFF.
6. Raise the vehicle, and make sure it is securelysupported.
7. Turn the ignition switch ON (II).
8. Measure voltage between the No. 3, No. 5, No. 7,and No. 9 terminals of the VTM-4 control unitconnector A (22P) and body ground while rotatingthe appropriate wheel one rotation a second.
Appropriate wheel Appropriate TerminalLeft-front A9
Right-front A7Left-rear A5
Right-rear A3
Check for poor connections or looseterminals at the VTM-4 control unit. If theconnections are OK, replace the VTM-4 control unit(see page 15-50).
Check for poor connections or loose terminalsbetween the VTM-4 control unit and the VSAmodulator-control unit. If the connections are OK,replace the VSA modulator-control unit (see page19-94).
Wire side of female terminals
Is DTC 26-1 indicated?
Are there any VSA DTCs indicated?
Are all f our readings about 2 V to 3 V?
07/05/09 16:43:52 61SJC020_150_0024
-
01
02
SJC8A00K80200081371FAAT01
-
-
-
-
-
-
-
-
DTC 37-1, 38-1:
YES
NO
YES
NO
YES
NO
YES
NO
15-25
VTM-4 CONTROL UNIT CONNECTOR A (22P)
NEP (BLU)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
NEP (BLU)
Engine RPM Signal Circuit
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTSs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check for DTC’s in the PGM-FI DTCs indicated
Go to the indicated DTCs troubleshooting.
Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect VTM-4 control unit connector A (22P).
7. Turn the ignition switch ON (II).
8. Measure voltage between the No. 12 terminal ofthe VTM-4 control unit connector A (22P) and bodyground with the engine running.
Condition VoltageIgnition switch ON (II) Above 8 V
Engine speed at 1,000 rpm 5 8 V
Go to step 18.
Go to step 9.
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector A (44P).
12. Turn the ignition switch ON (II).
13. Measure voltage between the No. 12 terminal ofthe VTM-4 control unit connector A (22P) and bodyground.
Repair short to power in the wire betweenthe VTM-4 control unit (A12) and the PCM (A28).
Go to step 14.
14. Turn the ignition switch OFF.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Is DTCs 37-1 and/ or 38-1 indicated?
Are there any PGM-FI DTCs indicated?
Is the voltage correct?
Is there voltage?
07/05/09 16:43:52 61SJC020_150_0025
03
01
02
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
15-26
Rear Differential
DTC Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
NEP (BLU)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
NEP (BLU)
JUMPER WIRE
PCM CONNECTOR A (44P)
NEP (BLU)
15. Check for continuity between the No. 12 terminal ofthe VTM-4 control unit connector A (22P) and bodyground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A12), and the PCM (A28).
Go to step 16.
16. Connect the No. 12 terminal of the VTM-4 controlunit connector A (22P) to body ground with ajumper wire.
17. Check for continuity between the No. 28 terminal ofthe PCM connector A (44P) and body ground.
Go to step 18.
Repair open in the wire between the VTM-4control unit (A12), and the PCM (A28).
18. Check for poor connections or loose terminals atthe VTM-4 control unit, and the PCM connectors. Ifthe connections are OK, replace the VTM-4 controlunit, then go to step 19.
19. Test-drive the vehicle, and watch the VTM-4indicator.
Replace the PCM (see page 11-205).
The system is OK at this time.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?Is there continuity?
Is DTCs 37-1 and/ or 38-1 indicated?
07/05/09 16:43:52 61SJC020_150_0026
01
SJC8A00K80200081411FAAT01
-
-
-
-
-
-
DTC 41-1, 41-2:
YES
NO
YES
NO
YES
NO
15-27
VTM-4 CONTROL UNIT CONNECTOR A (22P)
CANH (WHT)
PCM CONNECTOR A (44P)
CANH (WHT)
CANH (WHT) CANH (WHT)
VSA MODULATOR-CONTROL UNIT 46P CONNECTOR
CAN Communication (PCM/VSA System)
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check for a PCM/VSA system DTCs.
Troubleshoot the indicated PCM/VSADTCs.
Go to step 6.
5. Disconnect the VTM-4 control unit connector A(44P), and VSA modulator-control unit 46Pconnector.
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect the PCM connector A (44P).
9. Check for continuity between the VTM-4 controlunit connector A (22P) terminal No. 11 and PCMconnector A (44P) terminal No. 44, and between theVTM-4 control unit connector A (22P) terminalNo. 11 and VSA modulator-control unit 46Pconnector terminal No. 33.
Go to step 10.
Repair open in the wire between the VTM-4control unit (A11) and the PCM (A44), the VSAmodulator-control unit.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is DTCs 41-1 and/ or 41-2 indicated?
Is there a DTCs?
Is there continuity?
07/05/09 16:43:53 61SJC020_150_0027
02
-
-
YES
NO
15-28
Rear Differential
DTC Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
PCM CONNECTOR A (44P)
CANL (RED)
CANL (RED)
CANL (RED)
VSA MODULATOR-CONTROL UNIT 46P CONNECTOR
10. Check for continuity between the VTM-4 controlunit connector A (22P) terminal No. 22 and PCMconnector A (44P) terminal No. 9, and between theVTM-4 control unit connector A (22P) terminalNo. 22 and VSA modulator-control unit 46Pconnector terminal No. 12.
Check for poor connections or looseterminals at the VTM-4 control unit, PCM, VSAmodulator-control unit connectors. If theconnections are OK, replace the VTM-4 control unit(see page 15-50).
Repair open in the wire between the VTM-4control unit (A22) and the PCM (A9), the VSAmodulator-control unit.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
07/05/09 16:43:53 61SJC020_150_0028
01
02
03
SJC8A00K80200081421FAAT01
-
-
-
-
-
-
-
-
DTC 42-1, 42-2, 43-1:
YES
NO
YES
NO
YES
NO
YES
NO
15-29
DIFFERENTIAL OIL TEMPERATURESENSOR 2P CONNECTOR
VTM-4 CONTROL UNIT CONNECTOR A (22P)
TOH (WHT)TOL (BLK)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
TOH (WHT)TOL (BLK)
Differential OilTemperature Sensor
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with inthe HDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Turn the ignition switch OFF.
5. Remove the wire harness cover from the reardifferential (see page 15-49).
6. Disconnect the 2P connector from the differentialoil temperature sensor, then measure resistancebetween the No. 1 and No. 2 terminals of thedifferential oil temperature sensor.
Oil temperature Resistance32 °F (0 °C) 5.82 k to 7.26 k86 °F (30 °C) 1.53 k to 1.83 k212 °F (100 °C) 148 to 162284 °F (140 °C) 52 to 61
Go to step 7.
Replace the differential oil temperaturesensor (see page 15-49).
7. Disconnect VTM-4 control unit connector A (22P).
8. Turn the ignition switch ON (II).
9. Measure voltage between the No. 13 and No. 15terminals of the VTM-4 control unit connector A(22P) and body ground.
Repair short to power in the wire betweenthe VTM-4 control unit (A13 or A15) and thedifferential oil temperature sensor.
Go to step 10.
10. Turn the ignition switch OFF.
11. Check for continuity between the No. 13 and No. 15terminals of the VTM-4 control unit connector A(22P) and body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A13 or A15) and thedifferential oil temperature sensor.
Go to step 12.
(cont’d)
Terminal side of male terminals
Wire side of female terminals
Wire side of female terminals
Is DTCs 42-1, 42-2, and/ or 43-1 indicated?
Is the resistance correct?
Is there voltage?
Is there continuity?
07/05/09 16:43:53 61SJC020_150_0029
02
03
01
SJC8A00K80200081441FAAT00
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
DTC 44-1:
15-3015-30
Rear Differential
DTC Troubleshooting (cont’d)
DIFFERENTIAL OIL TEMPERATURESENSOR 2P CONNECTOR
JUMPER WIRE
VTM-4 CONTROL UNIT CONNECTOR A (22P)
TOH (WHT)TOL (BLK)
VTM-4 CONTROL UNIT CONNECTORS
PWR (RED/BLU)
FSR (ORN/GRN)
A (22P) B (12P)
12. Connect the differential oil temperature sensor 2Pconnector terminals to body ground with jumperwires.
13. Check for continuity between the No. 13 and No. 15terminals of the VTM-4 control unit connector A(22P) and body ground.
Check for poor connections or looseterminals at the VTM-4 control unit and thedifferential oil temperature sensor connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Repair open in the wire between the VTM-4control unit (A13 or A15) and the differential oiltemperature sensor.
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Measure voltage between the No. 4 terminal of theVTM-4 control unit connector A (22P) and bodyground, and between the No. 7 terminal of theVTM-4 control unit connector B (12P) and bodyground with the ignition switch ON (II), and with theengine started.
Condition B7 (PWR) A4 (FSR)Ignition switch
ON (II)Less than 3 V Battery
voltageEngine start Battery
voltageLess than 1 V
Go to step 16.
Go to step 5.
5. Turn the ignition switch OFF.
VTM-4 Relay
Terminal side of female terminals
Wire side of female terminals
Wire side of female terminalsIs there continuity?
Is DTC 44-1 indicated?
Is the voltage correct?
07/05/09 16:43:54 61SJC020_150_0030
01
03
04
-
-
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
YES
NO
15-31
VTM-4 RELAY 5P CONNECTOR
BLK/YEL
WHT/RED
PWR (RED/BLU)
FSR (ORN/GRN)
VTM-4 CONTROL UNIT CONNECTORS
A (22P) B (12P)
PWR (RED/BLU)
FSR (ORN/GRN)
VTM-4 CONTROL UNIT CONNECTORS
A (22P) B (12P)
6. Remove the VTM-4 relay, and test it (see page22-75).
Go to step 7.
Replace the VTM-4 relay (see page 15-50).
7. Turn the ignition switch ON (II) with the VTM-4relay removed.
8. Measure voltage between the No. 1 and No. 5terminals of the VTM-4 relay 5P connector andbody ground.
Go to step 9.
Check for blown No. 4 (20 A) fuse in theauxiliary fuse box or No. 18 (15 A) fuse in thedriver’s under-dash fuse/relay box. If the fuses areOK, repair open in the wire between the auxiliaryfuse box or the driver’s under-dash fuse/relay boxand the VTM-4 relay.
9. Turn the ignition switch OFF.
10. Disconnect the VTM-4 control unit connector A(22P) and connector B (12P).
11. Turn the ignition switch ON (II).
12. Measure voltage between the No. 4 terminal of theVTM-4 control unit connector A (22P) and bodyground, and between the No. 7 terminal of theVTM-4 control unit connector B (12P) and bodyground.
Repair short to power in the wire betweenthe VTM-4 control unit (A4 or B7) and the VTM-4relay.
Go to step 12.
13. Turn the ignition switch OFF.
14. Check for continuity between the No. 4 terminal ofthe VTM-4 control unit connector A (22P) and bodygrond, and between the No. 7 terminal of theVTM-4 control unit connector B (12P) and bodyground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A4 or B7) and the VTM-4relay.
Go to step 15.
(cont’d)
Terminal side of female terminals
Wire side of female terminals
Wire side of female terminals
Is the VTM-4 relay OK ?
Is there battery voltage?
Is there battery voltage?
Is there continuity?
07/05/09 16:43:54 61SJC020_150_0031
02
01
SJC8A00K80200081511FAAT01
-
-
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
YES
NO
DTC 51-1, 52-1, 53-1, 53-2, 54-1:
15-3215-32
Rear Differential
DTC Troubleshooting (cont’d)
PWR (RED/BLU)
VTM-4 CONTROL UNITCONNECTOR B (12P)
FSR (ORN/GRN)
VTM-4 RELAY CONNECTOR (5P)
RED/BLUORN/GRN
VTM-4 CONTROL UNITCONNECTOR A (22P)
LEFT CLUTCH ELECTROMAGNETIC COIL2P CONNECTOR
15. Check for continuity between the No. 4 terminal ofthe VTM-4 control unit connector A (22P) and theNo. 3 terminal of the VTM-4 relay, and between theNo. 7 terminal of the VTM-4 control unit connectorB (12P) and the No. 2 terminal of the VTM-4 relay.
Go to step 16.
Repair open in the wire between the A4 or B7terminals of the VTM-4 control unit and the VTM-4relay.
16. Check for poor connections or loose terminals atthe VTM-4 control unit and the VTM-4 relayconnectors. If the connections are OK, go to step17.
17. Test-drive the vehicle, and check for DTCs with theHDS.
Replace the VTM-4 control unit (see page15-50).
The system is OK at this time.
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Turn the ignition switch OFF.
5. Disconnect the left clutch electromagnetic coil 2Pconnector on the differential.
6. Measure resistance between the No. 1 and No. 2terminals of the left clutch electromagnetic coil 2Pconnector.
Go to step 7.
Replace the rear differential assembly.
Left ClutchElectromagnetic Coil
Wire side of female terminals
Terminal side of male terminals
Is there continuity?
Is DTC 44-1 indicated?
Is DTCs 51-1, 52-1, 53-2, and/ or 54-1 indicated?
Is there 1 to 3 ?
07/05/09 16:43:54 61SJC020_150_0032
02
03
04
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
15-33
LEFT CLUTCH ELECTROMAGNETIC COIL2P CONNECTOR
VTM-4 CONTROL UNIT CONNECTOR B (12P)
LCOL(BLK/WHT)
LCOH(BLK/RED)
VTM-4 CONTROL UNIT CONNECTOR B (12P)
LCOL(BLK/WHT)
LCOH(BLK/RED)
7. Measure resistance between the No. 1 terminal ofthe left clutch electromagnetic coil and differentialcarrier assembly.
Go to step 8.
Replace the rear differential assembly.
8. Disconnect the VTM-4 control unit connector B(12P).
9. Turn the ignition switch ON (II).
10. Measure voltage between the No. 1 and No. 2terminals of the VTM-4 control unit connector B(12P) and body ground.
Repair short to power in the wire betweenthe VTM-4 control unit (B1 or B2) and the left clutchelectromagnetic coil.
Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between the No. 1 and No. 2terminals of the VTM-4 control unit connector B(12P) and body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (B1 or B2) and the left clutchelectromagnetic coil.
Go to step 13.
(cont’d)
Terminal side of male terminals
Wire side of female terminals
Wire side of female terminalsIs there about 50 M or more?
Is there battery voltage?
Is there continuity?
07/05/09 16:43:55 61SJC020_150_0033
03
04
01
SJC8A00K80200081532FAAT10
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
DTC 53-2, 55-1, 56-1, 57-1, 58-1:
15-3415-34
Rear Differential
DTC Troubleshooting (cont’d)
LEFT CLUTCH ELECTROMAGNETIC COIL2P CONNECTOR
JUMPER WIRE
BLK/REDBLK/WHT
VTM-4 CONTROL UNIT CONNECTOR B (12P)
LCOL(BLK/WHT)
LCOH(BLK/RED)
RIGHT CLUTCH ELECTROMAGNETIC COIL/DIFFERENTIAL OIL TEMPERATURE SENSOR6P CONNECTOR
GRN
BRN
13. Connect a jumper wire between the No. 1 and No. 2terminals of the left clutch electromagnetic coil 2Pconnector.
14. Check for continuity between the No. 1 and No. 2terminals of the VTM-4 control unit connector B(12P).
Do the Rear Differential Function Test(see page 15-48). If the rear differential is normal,replace the VTM-4 control unit (see page 15-50).
Repair open in the wire between the VTM-4control unit (B1 or B2) and the left clutchelectromagnetic coil.
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Turn the ignition switch OFF.
5. Disconnect the right clutch electromagnetic coil/differential oil temperature sensor 6P connector onthe differential.
6. Measure resistance between the No. 3 and No. 6terminals of the right clutch electromagnetic coil/differential oil temperature sensor 6P connector.
Go to step 7.
Replace the rear differential assembly.
Right ClutchElectromagnetic Coil
Wire side of female terminals
Wire side of female terminals
Terminal side of male terminals
Is there continuity?
Is DTCs 53-2, 55-1, 56-1, 57-1, and/ or 58-1indicated?
Is there 1 to 3 ?
07/05/09 16:43:55 61SJC020_150_0034
02
03
04
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
15-35
RIGHT CLUTCH ELECTROMAGNETIC COIL/DIFFERENTIAL OIL TEMPERATURE SENSOR6P CONNECTOR
GRN
VTM-4 CONTROL UNIT CONNECTOR B (12P)
RCOL (GRN)RCOH (BRN)
VTM-4 CONTROL UNIT CONNECTOR B (12P)
RCOL (GRN)RCOH (BRN)
7. Measure resistance between the No. 3 terminal ofthe right clutch electromagnetic coil/differential oiltemperature sensor 6P connector and thedifferential carrier assembly.
Go to step 8.
Replace the rear differential assembly.
8. Disconnect the VTM-4 control unit connector B(12P).
9. Turn the ignition switch ON (II).
10. Measure voltage between the No. 3 and No. 4terminals of the VTM-4 control unit connector B(12P) and body ground.
Repair short to power in the wire betweenthe VTM-4 control unit (B3 or B4) and the rightclutch electromagnetic coil.
Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between the No. 3 and No. 4terminals of the VTM-4 control unit connector B(12P) and body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (B3 or B4) and the rightclutch electromagnetic coil.
Go to step 13.
(cont’d)
Terminal side of male terminals
Wire side of female terminals
Wire side of female terminals
Is there 50 M or more?
Is there battery voltage?
Is there continuity?
07/05/09 16:43:55 61SJC020_150_0035
03
04
-
-
YES
NO
15-36
Rear Differential
DTC Troubleshooting (cont’d)
RIGHT CLUTCH ELECTROMAGNETIC COIL/DIFFERENTIAL OIL TEMPERATURE SENSOR6P CONNECTOR
JUMPER WIRE
GRN
BRN
VTM-4 CONTROL UNIT CONNECTOR B (12P)
RCOL(GRN)
RCOH(BRN)
13. Connect a jumper between the No. 3 and No. 6terminals of the right clutch electromagnetic coil/differential oil temperature sensor 6P connector.
14. Check the for continuity between the No. 3 andNo. 4 terminals of the VTM-4 control unit connectorB (12P).
Do the Rear Differential Function Test(see page 15-48). If the rear differential is normal,replace the VTM-4 control unit (see page 15-50).
Repair open in the wire between the VTM-4control unit (B3 or B4) and the right clutchelectromagnetic coil.
Wire side of female terminals
Wire side of female terminalsWire side of female terminals
Is there continuity?
07/05/09 16:43:56 61SJC020_150_0036
SJC8A00K80200081591FAAT01 SJC8A00K80200081731FAAT02
-
-
-
-
-
-
-
-
-
-
DTC 59-1: DTC 73-1:
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
15-3715-37
Right/Left Clutch ElectromagneticCoil Power Supply
MAP (Manifold Absolute Pressure)Sensor or PCM
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check the battery.
Go to step 5.
Replace or charge the battery.
5. Watch the charging system indicator.
Check for poor connections or looseterminals at the VTM-4 control unit connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Check the charging system.
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check for DTCs in the PGM-FI system with the HDS.
Go to the indicated DTCs troubleshooting.
Check for poor connections or loose terminalsat the VTM-4 control unit and the PCM connectors.If the connections are OK, replace the VTM-4control unit (see page 15-50).
Is DTC 59-1 indicated?
Is the specif ied battery installed, and is it f ullycharged?
Does the charging system indicator come on withthe ignition switch ON (II), and go of f with theengine started?
Is DTC 73-1 indicated?
Are there any PGM-FI DTCs indicated?
07/05/09 16:43:56 61SJC020_150_0037
01
SJC8A00K80200081761FAAT01
-
-
-
-
-
-
-
-
DTC 76-1:
YES
NO
YES
NO
YES
NO
YES
NO
15-38
Rear Differential
DTC Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
Rear Differential Clutch WarningSystem
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Start the engine, shift the transmission into D. Test-drive the vehicle at speeds over 25 mph (40 km/h),while keeping the engine speed below 2,500 rpmfor at least 30 seconds.
NOTE: Be careful not to overheat the reardifferential clutch system.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at thistime.
5. Check for DTCs in the VSA system with the HDS.
Check the VSA system for DTCs (see page19-39).
Go to step 6.
6. Turn the ignition switch OFF.
7. Raise the vehicle, and make sure it is securelysupported.
8. Spin the rear wheels by hand, and check for rearbrake drag.
Repair cause of rear brake drag, and retest.
Go to step 9.
9. Turn the ignition switch ON (II).
10. Measure voltage between the No. 3 and No. 5terminals of the VTM-4 control unit connector A(22P) and body ground while rotating theappropriate wheel (1 rotation/second).
Appropriate wheel Appropriate TerminalLeft-rear A5Right-rear A3
Go to step 18.
Go to step 11.
11. Turn the ignition switch OFF.
12. Disconnect the VTM-4 control unit and the VSAmodulator-control unit connectors.
Wire side of female terminalsIs DTC 76-1 indicated?
Are there any VSA DTCs indicated?
Are the rear brakes dragging?
Is there about 2 to 3 V?
07/05/09 16:43:56 61SJC020_150_0038
02
03
04
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
15-39
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
RLP (GRY/YEL)RRP (GRY/RED)
JUMPER WIRE JUMPER WIRE
VSA MODULATOR-CONTROL UNIT 46P CONNECTOR
RLP (GRY/YEL) RRP (GRY/RED)
13. Check for continuity between the No. 3 and No. 5terminals of VTM-4 control unit connector A (22P)and body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A3 and/or A5) and the VSAmodulator-control unit.
Go to step 14.
14. Connect the No. 3 and No. 5 terminals of VTM-4control unit connector A (22P) to body ground withthe jumper wires.
15. Check for continuity between the VSA modulator-control unit 46P connector terminals and bodyground.
Appropriatewheel
Appropriate TerminalVTM-4
control unitVSA
modulator-control unit
Right-rear A3 5Left-rear A5 7
Go to step 16.
Repair open in the wire between the VTM-4control unit (A3 and/or A5) and the VSA modulator-control unit.
16. Check for poor connections or loose terminals atthe VTM-4 control unit and the VSA modulator-control unit connectors. If the connections are OK,replace the VTM-4 control unit, then go to step 17.
17. Start the engine, shift the transmission into D. Test-drive the vehicle at speeds over 25 mph (40 km/h),while keeping the engine speed below 2,500 rpmfor at least 30 seconds.
NOTE: Be careful not to overheat the reardifferential clutch system.
18. Check for DTCs with the HDS.
Replace the VSA modulator-control unit(see page 19-94).
The system is OK at this time.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity?
Is DTC 76-1 indicated?
07/05/09 16:43:56 61SJC020_150_0039
SJC8A00K80200081771FAAT01 SJC8A00K80200081781FAAT02
-
-
-
-
-
-
-
-
-
-
-
-
DTC 77-1: DTC 78-1:
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
15-4015-40
Rear Differential
DTC Troubleshooting (cont’d)
PCM VTM-4 Control Unit
NOTE:• Before you troubleshoot, review the general
troubleshooting information (see page 15-4).• Check the fuel and emissions system DTCs. If there is
a DTC, troubleshoot the indicated DTC first, thentroubleshoot DTC 77.
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Update the PCM if it does not have the latestsoftware (see page 11-7), or substitute a known-good PCM (see page 11-8).
5. Test-drive the vehicle, and check for DTCs with theHDS.
Check for loose terminal fit in the VTM-4control unit. If it is normal, replace the VTM-4control unit (see page 15-50).
If the PCM was updated, troubleshooting iscomplete. If the PCM was substituted, replace theoriginal PCM (see page 11-205).
NOTE: Before you troubleshoot, review the generaltroubleshooting information (see page 15-4).
1. Turn the ignition switch ON (II).
2. Clear the DTC (see page 15-8).
3. Test-drive the vehicle, and check for DTCs with theHDS.
Go to step 4.
Intermittent failure, the system is OK at thistime.
4. Check the battery.
Go to step 5.
Replace or charge the battery.
5. Watch the charging system indicator.
Go to step 6.
Check the charging system.
6. Check for installation of any aftermarket CB or Hamradios which may cause an RF signal interference.
Disconnect the aftermarket radio, andretest.
Check for poor connections or loose terminalsat the VTM-4 control unit connectors. If theconnections are OK, replace the VTM-4 control unit(see page 15-50).
Is DTC 77-1 indicated?
Is DTC 77-1 indicated?
Is DTC 78-1 indicated?
Is the specif ied battery installed, and is it f ullycharged?
Does the charging system indicator come on withthe ignition switch ON (II), and go of f with theengine started?
Is there an af termarket radio installed?
07/05/09 16:43:57 61SJC020_150_0040
01
02
SJC8A00E44381000000FAAT02
-
-
-
-
-
-
-
-
-
-
The VTM-4 indicator comes on, but no DTCsare stored in any system: VTM-4, VSA, orPCM
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
15-41
Symptom Troubleshooting
VTM-4 CONTROL UNIT CONNECTORS
IG 1 (YEL)
LG (BLK)
LG (BLK)
B (12P)A (22P)
VTM-4 CONTROL UNIT CONNECTORS
WARN 1(RED/WHT)
B (12P)A (22P)
WARN 2(RED/WHT)
1. Check the No. 21 (7.5 A) fuse in the driver’s under-dash fuse/relay box.
Go to step 2.
Replace the fuse, and recheck.
2. Reinitialize the VTM-4 control unit, and watch theVTM-4 indicator (see page 15-5).
Go to step 3.
The system is OK at this time.
3. Turn the ignition switch ON (II).
4. Measure voltage between the No. 1 and No. 10terminals of the VTM-4 control unit connector A(22P), and the No. 1 terminal of the VTM-4 controlunit connector A (22P) and the No. 12 terminal ofthe VTM-4 control unit connector B (12P).
Go to step 5.
Repair open in the wire between the VTM-4control unit (A1) and the driver’s under-dash fuse/relay box, or repair open in the wire between theVTM-4 control unit (A10 or B12) and body ground,or check the poor ground (G501).
5. Turn the ignition switch OFF.
6. Disconnect the VTM-4 control unit and the gaugecontrol module connectors.
7. Check for continuity between the No. 14 terminal ofthe VTM-4 control unit connector A (22P), and theNo. 11 terminal of the VTM-4 control unit connectorB (12P) to body ground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A14 or B11) and the gaugecontrol module.
Go to step 8.
8. Reconnect the gauge control module connectors.
9. Turn the ignition switch ON (II).
10. Watch the VTM-4 indicator.
Replace the gauge control module (see page22-263).
Check for poor connections or loose terminalsat the VTM-4 connectors. If the connections are OK,replace the VTM-4 control unit (see page 15-50).
Wire side of female terminals
Wire side of female terminals
Is the fuse OK ?
Does the VTM-4 indicator come on and stay on?
Is there battery voltage?
Is there continuity?
Does the VTM-4 indicator come on?
07/05/09 16:44:22 61SJC020_150_0041
01
02
03
SJC8A00E44381000000FAAT03
-
-
-
-
-
-
The VTM-4 indicator does not come on
YES
NO
YES
NO
YES
NO
15-42
Rear Differential
Symptom Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTORS
WARN 1(RED/WHT)
B (12P)A (22P)
WARN 2(RED/WHT)
JUMPER WIRE JUMPER WIRE
RED/WHT
JUMPER WIRE
GAUGE CONTROL MODULE CONNECTOR C (20P)
VTM-4 CONTROL UNIT CONNECTORS
WARN 1(RED/WHT)
B (12P)A (22P)
WARN 2(RED/WHT)
1. Do the gauge control module self-diagnosisfunction (see page 22-244).
Go to step 2.
Go to the gauge control module input test(see page 22-244) and check for an open or short inthe power and ground.
2. Disconnect the VTM-4 control unit connectors A(22P) and B (12P).
3. Connect the No. 14 terminal of the VTM-4 controlunit connector A (22P) and No. 11 terminal of theVTM-4 control unit connector B (12P) to bodyground with jumper wires.
4. Turn the ignition switch ON (II).
5. Watch the VTM-4 indicator.
Check for poor connections or looseterminals at the VTM-4 control unit connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect gauge control module connector A(30P).
8. Connect the No. 3 terminal of the gauge controlmodule connector C (20P) to body ground with ajumper wire.
9. Check for continuity between the No. 14 terminal ofthe VTM-4 control unit connector A (22P) and bodyground, and the No. 11 terminal of the VTM-4control unit connector B (12P) and body ground.
Substitute a known-good gauge controlmodule and recheck. If the symptom/indicationgoes away with the known-good gauge controlmodule, replace the original gauge control module(see page 22-263).
Repair open in the wire between the gaugecontrol module (C3) and the VTM-4 control unit.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is the gauge control module OK ?
Does the VTM-4 indicator come on?
Is there continuity?
07/05/09 16:44:22 61SJC020_150_0042
03
SJC8A00E44381000000FAAT04
-
-
-
-
-
-
-
-
-
-
-
-
The VTM-4 LOCK indicator does not come onwhen the VTM-4 LOCK switch is pressed
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
15-43
VTM-4 CONTROL UNIT CONNECTOR A (22P)
LOCKSW (BRN/WHT)
NOTE: The VTM-4 LOCK indicator will only come onwhen the engine is running and the transmission is inR, 1, or 2 before the VTM-4 LOCK switch is pressed.
1. Check the No. 21 (7.5 A) fuse in the driver’s under-dash fuse/relay box.
Go to step 2.
Replace the fuse, and recheck.
2. Turn the ignition switch ON (II).
3. Watch the VTM-4 LOCK indicator.
Go to step 4.
Go to step 11.
4. Start the engine, and move the shift lever to R, 1,and 2, then watch the VTM-4 LOCK indicator.
The system is OK at this time.
Go to step 5.
5. Check for an A/T system DTC.
Troubleshoot the A/T system indicatedDTC.
Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect the VTM-4 control unit connector A(22P).
8. Turn the ignition switch ON (II).
9. Connect a voltmeter between the A8 terminal of theVTM-4 control unit and body ground.
Check for poor connections or looseterminals at the VTM-4 control unit connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Go to step 10.
10. Test the VTM-4 LOCK switch (see page 15-49).
Repair open in the wire between the VTM-4LOCK switch and the VTM-4 control unit (see page15-50).
Replace the VTM-4 LOCK switch.
(cont’d)
Wire side of female terminals
Is the fuse OK ?
Does the VTM-4 LOCK indicator come on, anddoes it go of f about 4 seconds later?
Does the VTM-4 LOCK indicator come on whenthe VTM-4 LOCK switch is pressed?
Is there a DTC?
Is there battery voltage when the VTM-4 LOCKswitch is pressed?
Is the VTM-4 LOCK switch OK ?
07/05/09 16:44:22 61SJC020_150_0043
04
*01
02
*02
-
-
-
-
-
-
YES
NO
YES
NO
YES
NO
15-44
Rear Differential
Symptom Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
LOCKH (YEL/BLK)
JUMPER WIRE
JUMPER WIRE
YEL/BLK
VTM-4 LOCK SWITCH 6P CONNECTOR
LOCKH (YEL/BLK)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
YEL
VTM-4 LOCK SWITCH 6P CONNECTOR
11. Connect the No. 16 terminal of the VTM-4 controlunit connector A (22P) to body ground with ajumper wire.
12. Watch the VTM-4 LOCK indicator.
Check for poor connections or looseterminals at the VTM-4 control unit connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Go to step 13.
13. Turn the ignition switch OFF.
14. Remove the VTM-4 LOCK switch.
15. Connect the No. 5 terminal of the VTM-4 LOCKswitch 6P connector to body ground with a jumperwire.
16. Check the continuity between the No. 16 terminalof the VTM-4 control unit connector A (22P) andbody ground.
Go to step 17.
Repair open in the wire between the VTM-4control unit (A16) and the VTM-4 LOCK switch.
17. Turn the ignition switch ON (II).
18. Measure voltage between the No. 2 terminal of theVTM-4 LOCK switch 6P connector and body ground.
Replace the VTM-4 LOCK indicator bulb.
Repair open in the wire between the No. 2terminal of the VTM-4 LOCK switch 6P connectorand the driver’s under-dash fuse/relay box.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Does the VTM-4 LOCK indicator come on?
Is there continuity?
Is there battery voltage?
07/05/09 16:44:23 61SJC020_150_0044
03
SJC8A00E44381000000FAAT05
-
-
-
-
The VTM-4 LOCK indicator comes on whenthe ignition switch is turned ON (II) and doesnot go off
YES
NO
YES
NO
15-45
VTM-4 CONTROL UNIT CONNECTOR A (22P)
LOCKH(YEL/BLK)
1. Disconnect the VTM-4 control unit connector A(22P).
2. Turn the ignition switch ON (II).
3. Watch the VTM-4 LOCK indicator.
Go to step 4.
Check for poor connections or loose terminalsat the VTM-4 control unit connectors. If theconnections are OK, replace the VTM-4 control unit(see page 15-50).
4. Turn the ignition switch OFF.
5. Disconnect the VTM-4 LOCK switch 6P connector.
6. Check for continuity between the No. 16 terminal ofthe VTM-4 control unit connector A (22P) and bodyground.
Repair short to ground in the wire betweenthe VTM-4 control unit (A16) and the VTM-4 LOCKswitch.
Replace the VTM-4 LOCK switch (see page15-49).
Wire side of female terminals
Does the VTM-4 LOCK indicator come on?
Is there continuity?
07/05/09 16:44:23 61SJC020_150_0045
07
*01
04
*02
SJC8A00E44381000000FAAT06
-
-
-
-
-
-
The VTM-4 LOCK indicator does not come onfor about 4 seconds when the ignition switchis turned ON (II)
YES
NO
YES
NO
YES
NO
15-46
Rear Differential
Symptom Troubleshooting (cont’d)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
LOCKH(YEL/BLK)
JUMPER WIRE
JUMPER WIRE
YEL/BLK
VTM-4 LOCK SWITCH 6P CONNECTOR
LOCKH (YEL/BLK)
VTM-4 CONTROL UNIT CONNECTOR A (22P)
YEL
VTM-4 LOCK SWITCH 6P CONNECTOR
1. Disconnect the VTM-4 control unit connector A(22P).
2. Turn the ignition switch ON (II).
3. Connect the No. 16 terminal of the VTM-4 controlunit connector A (22P) to body ground with ajumper wire.
4. Watch the VTM-4 LOCK indicator.
Check for poor connections or looseterminals at the VTM-4 control unit connectors. Ifthe connections are OK, replace the VTM-4 controlunit (see page 15-50).
Go to step 5.
5. Turn the ignition switch OFF.
6. Remove the VTM-4 LOCK switch.
7. Connect the No. 5 terminal of the VTM-4 LOCKswitch 6P connector to body ground with a jumperwire.
8. Check for continuity between the No. 16 terminal ofthe VTM-4 conntrol unit connector A (22P) andbody ground.
Go to step 9.
Repair open in the wire between the VTM-4control unit (A16) and the VTM-4 LOCK switch.
9. Turn the ignition switch ON (II).
10. Measure voltage between the No. 2 terminal of theVTM-4 LOCK switch 6P connector and body ground.
Replace the VTM-4 LOCK indicator bulb.
Repair open in the wire between the No. 2terminal of the VTM-4 LOCK switch 6P connectorand the driver’s under-dash fuse/relay box.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Does the VTM-4 LOCK indicator come on?
Is there continuity?
Is there battery voltage?
07/05/09 16:44:23 61SJC020_150_0046
01
SJC8A00E44300019635MDAT00
Fluid capacity:
2.64 L (2.79 US.qt) at fluid change
Recommended fluid:
VTM-4 Differential Fluid (P/N 0822-9003)
15-47
Rear Differential Fluid Inspection and Replacement
A47 N·m(4.8 kgf·m,35 lbf·ft)
D47 N·m(4.8 kgf·m,35 lbf·ft)
B
ABC
1. With the vehicle on level ground, inspect thedifferential fluid with the ignition switch OFF.
2. Remove the oil filler plug (A) and sealing washer(B), then check the condition of the fluid, and makesure the fluid is at the proper level (C).
3. The fluid level must be up to the fill hole. If it isbelow the hole, add the recommended fluid until itruns out, then reinstall the oil filler plug with a newsealing washer.
4. If the differential fluid is dirty, remove the drainplug (D) and sealing washer (B), then drain the fluid.
5. Clean the drain plug, then reinstall with a newwasher, and refill the differential with therecommended fluid to the proper level.
6. Reinstall the oil filler plug with a new washer.
07/05/09 16:44:24 61SJC020_150_0047
SJC8A00E44300000000FEAT00
15-48
Rear Differential
Rear Differential Function Test
NOTE: Before doing the Differential Function Test, the following conditions must be present.• No DTCs detected• Engine is OFF• The VTM-4 control unit must be initialized
1. Connect the HDS to the data link connector (DLC).
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the VTM-4 control unit. If it doesn’t go to the DLC circuit troubleshooting(see page 11-194).
4. Confirm that the temperature of the differential oil is between 68 °F (20 °C) and 140 °F (60 °C) with the HDS.
5. Turn the ignition switch OFF with the shift lever in P.
6. Raise the vehicle so all four wheels are off the ground, and make sure the vehicle is securely supported (see page1-10).
7. Remove the rear wheels (see page 18-28).
8. Release the parking brake.
9. Turn the iginition switch ON (II).
10. Select MISCELLANEOUS TEST, then select the LEFT CLUTCH ELECTROMAGNETIC COIL TEST with the HDS, andfollow the screen prompts. If the results are NORMAL, the left clutch is OK, go to step 11. If the results areABNORMAL, replace the rear differential.
11. Select MISCELLANEOUS TEST, then select the RIGHT CLUTCH ELECTROMAGNETIC COIL TEST with the HDS,and follow the screen prompts. If the results are NORMAL, the right clutch is OK. If the results are ABNORMAL,replace the rear differential.
07/05/09 16:44:24 61SJC020_150_0048
01
SJC8A00E44381019638KBAT01
01
*01
SJC8A00E44381063521FHAT02
15-4915-49
Rear Differential Fluid TemperatureSensor Replacement
VTM-4 LOCK Switch Test/Replacement
6 x 1.0 mm12 N·m (1.2 kgf·m, 8.7 lbf·ft)
A
C18 N·m(1.8 kgf·m, 13 lbf·ft)
D
B
A
B
C
Terminal
Position
Release the switch
1 2 3
Press the switch
4 5
1. Remove the wire harness cover (A), thendisconnect the differential oil temperature sensor2P connector (B).
2. Remove the differential oil temperature sensor (C).
3. Install the differential oil temperature sensor in thereverse order of removal, with a new O-ring (D).
1. Remove the instrument panel (see page 20-81).
2. Disconnect the 5P connector (A) from the VTM-4LOCK switch (B), then remove the VTM-4 LOCKswitch.
3. Check for continuity between the terminals in eachswitch position according to the table.
4. If the continuity check is not as specified, replacethe bulbs (C) or the VTM-4 LOCK switch.
07/05/09 16:44:24 61SJC020_150_0049
01
SJC8A00E44381063501KBAT01
01
02
SJC8A00E44381063531KBAT02
15-5015-50
Rear Differential
VTM-4 Control Unit Replacement VTM-4 Relay Replacement
B
A12 N·m(1.2 kgf·m, 8.7 lbf·ft)
A
BC
D
A
NOTE: The VTM-4 control unit must be initialized(see page 15-5) after replacement, otherwise the 4WDsystem will not function.
1.
2. Remove the three bolts (A) from the VTM-4 controlunit (B).
3. Disconnect the VTM-4 control unit connectors.
4. Install the VTM-4 control unit in the reverse order ofremoval.
1. Remove the instrument side panel (A) and thescrew (B).
2. Remove the instrument under panel (C) and theconnectors (D).
3. Remove the VTM-4 relay (A).
4. Install the VTM-4 relay in the reverse order ofremoval.
07/05/09 16:44:25 61SJC020_150_0050
Remove the right side kick panel (see page 20-60).
01
SJC8A00E44300019595KBAT00
15-51
Rear Differential Breather, Line, and Hose Replacement
110 mm (4.33 in.)
WHITE MARK
A
B
C
D
E
F
1. Remove the left side bed panel (see page 20-162).
2. Remove the bed floor panel (see page 20-163).
3. Remove the breather (A) and the line (C), then remove the hoses (B, D, F).
4. Connect and install the breather (A) and the hose (B).
5. Clamp the line (C) into place, then connect it to the upper hose (B).
6. Connect the breather joint (E) to the line (C) with the short hose (D).
7. Connect the joint to the lower hose (F), then connect the hose to the differential.
8. Make sure that all the hoses are properly routed, clipped into place, and not pinched.
07/05/09 16:44:25 61SJC020_150_0051
01
SJC8A00E44300019625KBAT00
15-52
Rear Differential
Rear Differential Mount Replacement
REAR DIFFERENTIALMOUNT B RUBBERINSULATER
REAR DIFFERENTIALMOUNT C RUBBERINSULATER
REAR SUBFRAME
Press.
Press.
07/05/09 16:44:25 61SJC020_150_0052
*01
SJC8A00E44300000000KAAT00
Exploded View
15-53
Rear Differential Removal
A: 27 N·m (2.8 kgf·m, 20 lbf·ft)B: 12 N·m (1.2 kgf·m, 8.7 lbf·ft)
REAR DIFFERENTIAL CARRIERASSEMBLY
REAR DIFFERENTIAL MOUNT ARUBBER INSULATER
SET RING
THRUST WASHER
HALF SHAFT OUTER SEAL
REAR DIFFERENTIAL HARNESSBRACKET A
REAR DIFFERENTIAL CABLEBRACKET C
REAR DIFFERENTIAL CABLEBRACKET F
DIFFERENTIAL OIL TEMPERATURESENSOR
SEALING WASHER
DRAIN PLUG47 N·m (4.8 kgf·m, 35 lbf·ft)
REAR DIFFERENTIAL HARNESSBRACKET B
B
A
B
B
A
A
A
A
O-RING
FILLER PLUG47 N·m (4.8 kgf·m, 35 lbf·ft)
(cont’d)
Replace.
Replace.
Replace.
Replace.
Replace.
07/05/09 16:44:26 61SJC020_150_0053
02
03
Special Tools Required
15-54
Rear Differential
Rear Differential Removal (cont’d)
A
BC
D
E
D
D
A
Driveshaft remover 07AAD-S9VA000
1. Drain the differential fluid (see page 15-47).
2. Make a reference mark across the propeller shaft,the transfer, and the rear differential, then removethe propeller shaft (see page 16-40).
3. Remove the rear driveshaft (see page 16-24).
4. Place a transmission jack under the rear differential(A).
5. Disconnect the 6P (B) and 2P (C) connectors, thenremove the mounting bolts (D) and washer (E).
6. Lower the rear differential a little on thetransmission jack.
7. Disconnect the breather hose (B) from the reardifferential.
8. Lower the rear differential on the transmission jack.
07/05/09 16:44:26 61SJC020_150_0054
01
SJC8A00E44300000000MAAT00
- -Standard: 1.23 2.38 mm (0.048 0.094 in.)
15-55
Backlash Inspection
A
B
C
Connecting battery voltage to either the right or leftclutch electromagnetic coils for more than3 minutes will damage the rear differential.
1. Install the left rear driveshaft, then connect thebattery power to the No. 1 terminal of the left clutchelectromagnetic coil 2P connector (A) and groundto the No. 2 terminal.
2. Check the backlash of the companion flange (B)with a dial indicator (C).
3. If the backlash is out of standard, replace the reardifferential.
07/05/09 16:44:27 61SJC020_150_0055
01
02
03
SJC8A00E44300000000KCAT00
15-56
Rear Differential
Rear Differential Installation
A
A14 x 1.5 mm85 N·m (8.7 kgf·m, 63 lbf·ft)
A10 x 1.25 mm55 N·m (5.6 kgf·m, 41 lbf·ft)
A14 x 1.5 mm85 N·m(8.7 kgf·m,63 lbf·ft)
B
CD
AB
CYellow reference marks
1. Raise the rear differential a little on thetransmission jack, then connect the breather tube(A) to the rear differential.
2. Raise the rear differential to the mounting level,then install the mounting bolts (A) and washer (B).
3. Connect the 6P (C) and 2P (D) connectors.
4. Install the rear driveshaft (see page 16-36).
5. Install the new rear differential (A) onto thepropeller shaft (B), by aligning the reference mark(C). Make sure you use new mounting bolts.
6. Attach the propeller shaft to the transfer and therear differential by aligning the reference marks(see page 16-41).
7. Refill the differential with recommended fluid(see page 15-47).
07/05/09 16:44:27 61SJC020_150_0056