DIAGNOSIS AND TESTINGww2.justanswer.com/uploads/s420/2011-11-10_005236_03_expediti… · 2011-11-10...

310-03-1 310-03-1Speed Control

DIAGNOSIS AND TESTING

NOTE: The deactivator switch is provided as anSpeed Controladditional safety feature.Refer to Wiring Diagrams Cell 31, Speed Control

for schematic and connector information. Normally, when the brake pedal is pressed, the

PCM will deactivate the speed control system.Special Tool(s)

Under increased brake pedal effort, the deactivator

73III Automotive Meter switch, a normally closed switch, will open and105-R0057 or equivalent remove power to the speed control actuator clutch,

releasing the throttle independently of the PCM.

The clockspring provides the electrical interface

between the steering column wiring and the speed

control switches in the steering wheel.

The PCM sends a standard corporate protocol (SCP)Worldwide Diagnostic System

output message to the instrument cluster to indicate(WDS)when the vehicle speed control system is active.418-F224,

New Generation STAR (NGS)Inspection and Verification

Tester418-F052, or equivalent 1. Verify the customer concern by operating thediagnostic tool with appropriate speed control to duplicate the condition.adapter cable

2. Verify the speedometer operates correctly

Principles of Operation without speed control by test driving the

vehicle. If the speedometer does not operateThe speed control system is designed to maintain acorrectly, refer to Section 413-01.selected vehicle speed between approximately 40

and 200 km/h (25 and 125 mph). 3. Verify the stoplamps operate correctly with the

ignition switch in the OFF position. If theThe electronic stepper motor (internal to the speedstoplamps do not operate correctly, refer tocontrol actuator) is controlled by turning the threeSection 417-01.phases of the motor on and off in sequence. The

sequence determines the motor direction (open 4. Verify the brake warning indicator is operating

throttle or closed throttle based on vehicle speed). correctly. If the brake warning indicator is not

operating correctly, refer to Section 413-01.The speed control module is fully integrated into the

powertrain control module (PCM). The PCM 5. NOTE: Any aftermarket modifications,

strategy uses engine control to accelerate smoothly. including but not limited to those listed below,

In instances where the vehicle tends to want to may cause the speed control to not operate

exceed the set speed, the PCM will invoke an correctly:

engine braking strategy to help maintain the desired• Any wiring or lamp modifications affecting

vehicle speed.the brake lamp operation

Whenever the system is engaged and active, a speed• LED brake lamps

control set indicator will be illuminated in the• Non-factory installed trailer wiringinstrument cluster.

• Radios (speed sensitive, auto mute)The brake pedal position (BPP) switch is a normally

open switch. When the brake pedal is applied with • Remote starters and alarmsthe speed control system engaged, the BPP switch

• Lighting and electrical accessorycloses to battery voltage, putting the vehicle speed

modificationscontrol in stand-by mode.

Visually inspect for obvious signs of

mechanical or electrical damage:

• Visually inspect the speed control actuator

and accelerator controls.

Copyright 2002, Ford Motor CompanyLast updated: 8/16/2006 2003 Expedition/Navigator, 6/2002


DIAGNOSIS AND TESTING (Continued)

Diagnostic tool• Visually inspect the speed control cable

without removing it and ensure smooth 1. Connect the diagnostic tool to the data linkcable operation. Inspect the speed control connector (DLC) located beneath the instrumentcable connection to the throttle body. panel, and select the vehicle to be tested from

the diagnostic tool menu. If the diagnostic tool• Visually inspect the accelerator cabledoes not communicate with the vehicle:without removing it and ensure smooth

cable operation. Inspect the accelerator cable • check that the program card is correctlyconnection to the throttle body. Also check installed.for cable interference with the carpet,

• check the connections to the vehicle.bulkhead grommet, insulation and

• check the ignition switch position.instrument panel wiring.

2. If the diagnostic tool still does not communicateVisual Inspection Chart

with the vehicle, refer to the diagnostic tool

Mechanical Electrical operating manual.

• Speed control cable • Central junction box 3. Carry out the diagnostic tool data link test. If• Throttle lever (CJB) fuse(s): the diagnostic tool responds with:• Speed control actuator — 5 (7.5A)

• SCP or ISO circuit fault; all electronic• Brake pedal position — 12 (10A)(BPP) switch — 28 (5A) control units no response/not equipped, refer

• Speed control • Circuitry to Section 418-00.deactivator switch

• No response/not equipped for PCM, GO to• Bent brake pedalPinpoint Test A.deactivator switch tab

• Power control module • System passed, retrieve and record the(PCM)

continuous diagnostic trouble codes (DTCs),

erase the continuous DTCs and carry out the6. If an obvious cause for an observed or reported KOEO Test.

concern is found, correct the cause (if possible)4. If the DTCs retrieved are related to the concern,

before proceeding to the next step.go to the PCM Diagnostic Trouble Code (DTC)

7. If the cause of the fault is not visually evident, Index to continue diagnostics.proceed to diagnoses of the speed control

5. CARRY OUT the Speed Control Self-Testsystem by:

Diagnostics.

• connecting the diagnostic tool or 6. If no DTCs related to the concern are retrieved,

proceed to the Symptom Chart to continue• entering the speed control self-test.diagnostics.

NOTE: DTC P0703 and DTC P1572 must be

repaired before any other DTC.

Speed Control Actuator Diagnostic Trouble Code (DTC) Index

NOTE: Carry out the speed control self-test diagnostics before proceeding with pinpoint testdiagnostics.

DTCs Description Source Action

P0500 Vehicle Speed Error PCM REFER to the PowertrainControl/Emissions

Diagnosis (PC/ED) manual.

P1703 Brake On/Off (BOO) PCM GO to Pinpoint Test F.Switch Out of Self-Test

Range

2003 Expedition/Navigator, 6/2002



Self-Test Diagnostics • NOTE: The lamp flash is too slow and must be

ignored. The module times out if each button isWARNING: This test is a key on engine

not pressed within one second of the previousoff (KOEO) test only that is conducted in PARK

button. Ignore the cluster lamp flashes but observeonly with the emergency brake fully engaged.

the dynamic throttle pull which occurs at the endNOTE: The transmission selector needs to be in the of the button sequence. Waiting for the clusterNEUTRAL (N) position. lamp to flash could result in a self-test time out

condition. If a module time out occurs, theNOTE: Review the following steps before carryingprocedure must be re-initiated.out the self-test diagnostic procedure.

Firmly press and release the remaining switchesNOTE: After entering the diagnostic mode, thewithin one second of each other in the followingmodule times out if the mandatory switch sequencesequence:is not completed within 5 seconds and each button

is not pressed within one second of the previous — ONbutton. If a module time-out occurs (speed control

— RSM (resume)lamp stops flashing part way through the test), the

— CST (coast)procedure must be re-initiated.

— CANCEL (if equipped)The self-test is comprised of 2 parts. The first part

is a static check of the speed control electronics — SET/ACCELmodule and system. The second part is a dynamic

• NOTE: Monitor the PCM throttle position PIDpull-test to check the actuator motor and gear

after the last button is pressed.mechanism. To perform the self-test:

NOTE: The dynamic test occurs automatically after• Connect the diagnostic tool to a power source that

the static test completes. If the static test fails, thereis not interrupted when the ignition switch

will be no dynamic pull test.changes positions. With the ignition switch in the

NOTE: During the dynamic pull test, one sharpRUN position, set the diagnostic tool to monitorclicking sound should be heard (indicating the servothe powertrain control module (PCM) throttleclutch engagement) followed by a gear soundposition PID while the speed control actuator(indicating the servo motor turning).carries out the self-test.Within 0.25 second after the static test has passed,

• Enter self-test diagnostics by firmly pressing andthe speed control actuator carries out a dynamic pull

holding the speed control OFF switch whiletest. The actuator automatically pulls the speed

quickly cycling the ignition switch fromcontrol cable 1 to 10 mm (0.04 to 0.39 inches) to

RUN-to-OFF-to-RUN, making sure the enginemove the throttle from the idle position and then

does not start and is not running. The speedreleases the speed control cable returning the

control indicator lamp on the instrument panelthrottle to the idle position. If the PID value does

will flash once to indicate that the speed controlnot change during the dynamic throttle pull, GO to

module has entered the diagnostic mode. ReleaseSymptom Chart.

the OFF switch. If 5 additional flashes are• Turn the key to OFF and GO to Symptom Chart.displayed at this point, a speed control subsystem

concern exists. GO to Symptom Chart.




Symptom Chart

NOTE: Carry out the speed control self-test

diagnostics before entering the symptom chart.

Symptom Chart

Condition Possible Sources Action

• No communication with the • Central junction box (CJB) • GO to Pinpoint Test A. powertrain control module fuse(s):(PCM) — 5 (7.5A)

— 34 (20A)• Circuitry. • PCM.

• The speed control does not • Speed control actuator. • GO to Pinpoint Test C. disengage when the brake are • Brake pedal position (BPP)applied switch.

• Speed control switch.• Deactivator switch.

• The speed control switches • Speed control switch. • GO to Pinpoint Test D. are inoperative—no DTCs

• The speed control indicator • Instrument cluster. • REFER to Section 413-01.lamp is always on

• The speed control is • Speed control cable. • GO to Pinpoint Test E.inoperative — flash with last • Speed control actuator.switch pressed and no • Circuitry.dynamic pull occurs atthrottle

• Flash code 2 — brake pedal • Circuitry. • GO to Pinpoint Test F. position (BPP) switch circuit • BPP switch.failure. • Speed control servo.

• Flash code 3 — deactivator • Central junction box (CJB) • GO to Pinpoint Test G. switch circuit failure. fuse 34 (10A).

• Circuitry.• Deactivator switch.• Speed control servo.

• The speed control is • Circuitry. • GO to Pinpoint Test B.inoperative—no DTCs • Deactivator switch.

• Digital transmission range(TR) sensor.

• Low battery voltage.

Pinpoint Test

PINPOINT TEST A: NO COMMUNICATION WITH THE POWERTRAIN CONTROL MODULE (PCM)

Test Step Result / Action to Take

A1 CHECK THE PCM POWER CIRCUITS

• Key in OFF position.• Disconnect: PCM C175b.• Key in ON position.• Measure the voltage between the PCM C175b and ground as

follows:

(Continued)




PINPOINT TEST A: NO COMMUNICATION WITH THE POWERTRAIN CONTROL MODULE (PCM)(Continued)


A1 CHECK THE PCM POWER CIRCUITS (Continued)

Pin Circuit

34 361 (RD)

40 729 (RD/WH)

46 361 (RD)

YesGO to A2.

NoREPAIR the circuit. CLEAR the DTCs.

• Are the voltages greater than 10 volts? REPEAT the self-test.

A2 CHECK THE PCM GROUND CIRCUITS

• Key in OFF position.• Measure the resistance between the PCM C175b and ground as

follows:

Pin Circuit

1 570 (BK/WH)

10 567 (LB/YE)

11 570 (BK/WH)

23 570 (BK/WH)

YesREFER to Section 418-00 to continuecommunication diagnostics.


• Are the resistances less than 5 ohms? REPEAT the self-test.




PINPOINT TEST B: THE SPEED CONTROL IS INOPERATIVE—NO DTCs

NOTE: It is important to use a voltage drop test on some of the tests where specified. Circuitsmay indicate a good voltage and continuity but may not be capable of carrying sufficientcurrent.


B1 CHECK THE PCM POWER CIRCUITS

NOTE: Carry out the speed control self-test diagnostics beforeentering the pinpoint test.

• Key in OFF position.• Disconnect: PCM C175b.• Key in ON position.• Measure the voltage between the PCM C175b and ground as

follows:

Pin Circuit

34 361 (RD)

40 729 (RD/WH)

46 361 (RD)

YesGO to B2.

NoREPAIR the circuit in question. CLEAR the

• Are the voltages greater than 10 volts? DTCs. REPEAT the self-test.

B2 CHECK THE PCM GROUND CIRCUITS

• Key in OFF position.• Measure the resistance between the PCM C175b and ground as

follows:

Pin Circuit

1 570 (BK/WH)

10 567 (LB/YE)

11 570 (BK/WH)

23 570 (BK/WH)

(Continued)




PINPOINT TEST B: THE SPEED CONTROL IS INOPERATIVE—NO DTCs (Continued)


B2 CHECK THE PCM GROUND CIRCUITS (Continued)

YesGO to B3.


• Are the resistances less than 5 ohms? DTCs. REPEAT the self-test.

B3 CHECK CIRCUIT 1928 (RD/WH) FOR AN OPEN

• Key in OFF position.• Disconnect: Speed Control Actuator C122.• Key in ON position.• Measure the voltage between the speed control actuator C122

pin 1, circuit 1928 (RD/WH), harness side and ground.

YesGO to B4.


• Is the voltage greater than 10 volts? REPEAT the self-test.

B4 CHECK THE VOLTAGE DROP ON CIRCUIT 1928 (RD/WH)

• Measure the voltage drop on the speed control actuator C122-1, Yescircuit 1928 (RD/WH). GO to B5.

• Is the voltage drop less than 0.3 volts? NoREPAIR the circuit. REPEAT the self-test.

(Continued)






B5 CHECK THE DEACTIVATOR SWITCH CIRCUITRY FOR ANOPEN

• Measure the voltage between the speed control actuator C122pin 6, circuit 307 (BK/YE), harness side and ground.

YesGO to B6.

NoCHECK for correct speed controldeactivator switch adjustment. REPAIR thecircuit. CLEAR the DTCs. REPEAT the

• Is the voltage greater than 10 volts? self-test.

B6 CHECK THE VOLTAGE DROP ON CIRCUIT 307 (BK/YE)

• Measure the voltage drop on the speed control actuator C122 Yespin 6, circuit 307 (BK/YE). GO to B7.

• Is the voltage drop less than 0.3 volts? NoREPAIR the circuit. CLEAR the DTCs.REPEAT the self-test.

B7 CHECK CIRCUIT 1927 (TN) FOR SHORT TO POWER

• Key in ON position.• Measure the voltage between the speed control actuator C122

pin 5, circuit 1927 (TN), harness side and ground.

YesREPAIR the circuit. CLEAR the DTCs.REPEAT the self-test.

No• Is any voltage present? GO to B8.

B8 CHECK CIRCUIT 1927 (TN) FOR AN OPEN

• Key in OFF position.

(Continued)






B8 CHECK CIRCUIT 1927 (TN) FOR AN OPEN (Continued)

• Measure the resistance between the speed control actuatorC122 pin 5, circuit 1927 (TN), harness side and the PCM C175bpin 26, circuit 1927 (TN), harness side.

YesGO to B9.

NoREPAIR the circuit. CLEAR the

• Is the resistance less than 5 ohms? DTCs.REPEAT the self-test.

B9 CHECK CIRCUIT 1927 (TN) FOR SHORT TO GROUND

• Measure the resistance between the speed control actuatorC122 pin 5, circuit 1927 (TN), harness side and ground.

YesGO to B10.


• Is the resistance greater than 10,000 ohms? REPEAT the self-test.

B10 CHECK THE SPEED CONTROL ACTUATOR

• Key in OFF position.• Measure the resistance between the speed control actuator pins

(component side) as follows:

Speed Control Actuator

Pin 1 Pin 2

Pin 1 Pin 3

Pin 1 Pin 4

(Continued)


310-03-10 310-03-10Speed Control




B10 CHECK THE SPEED CONTROL ACTUATOR (Continued)

YesGO to B11.

NoINSTALL a new speed control actuator.REFER to Speed Control Actuator in thissection. CLEAR the DTCs. REPEAT the

• Are the resistances between 2 and 3 ohms? self-test.

B11 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORSHORT TO POWER

• Disconnect: PCM C175b.• Key in ON position.• Measure the voltage between the PCM C175b, harness side and

ground as follows:

PCM C175b Circuit

Pin 35 1924 (DG/WH)

Pin 24 1925 (PK/BK)

Pin 12 1926 (VT/YE)

YesREPAIR the circuit in question. CLEAR theDTCs. REPEAT the self-test.


B12 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORAN OPEN

• Key in OFF position.• Measure the resistance between the PCM C175b, harness side

and the speed control actuator C122, harness side as follows:

(Continued)


310-03-11 310-03-11Speed Control




B12 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORAN OPEN (Continued)

Speed ControlPCM C175b Actuator C122 Circuit

Pin 35 Pin 4 1924 (DG/WH)

YesPin 24 Pin 3 1925 (PK/BK)GO to B13.

Pin 12 Pin 2 1926 (VT/YE) NoREPAIR the circuit in question. CLEAR the


B13 CHECK FOR CONTINUITY

• Key in OFF position.• Disconnect: PCM C175b.• Measure the resistance between the PCM C175b pin 37, circuit

151 (LB/BK), harness side and the PCM C175b pin 17, circuit848, (DG/OG), harness side.

YesGO to B14.

No• Is the resistance between 4,085 and 4,515 ohms? GO to B15.

B14 CHECK THE SPEED CONTROL SWITCHES

• Measure the resistance between the PCM C175b pin 37, circuit151 (LB/BK), harness side and the PCM C175b pin 17, circuit848, (DG/OG), harness side while pressing the switches.

Speed Control Switch with remote audio/climate control

Speed Control ActuatorSwitch Resistance Value

SETt - Between 285 and 315 ohms

SET + Between 570 and 630 ohms

Resume Between 1,055 and 1,165 ohms

On Between 1,995 and 2,205 ohms

Off Less than 5 ohms

(Continued)


310-03-12 310-03-12Speed Control




B14 CHECK THE SPEED CONTROL SWITCHES (Continued)

YesGO to B18.

NoINSTALL a new speed control switch.REFER to Speed Control Switch — WithRemote Audio/Climate Control or SpeedControl Switch — Without Remote

• Are the speed control actuator switch resistances values Audio/Climate Control in this section.OK? CLEAR the DTCs. REPEAT the self-test.

B15 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR OPEN

• Disconnect: Clockspring C218b.• Measure the resistance between the PCM C175b pin 37, circuit

151 (LB/BK), harness side and the clockspring C218b pin 4,circuit 151 (LB/BK), harness side; and measure the resistancebetween the PCM C175b pin 17, circuit 848 (DG/OG), harnessside and the clockspring C218b pin 5, circuit 848 (DG/OG),harness side.

YesGO to B16.



B16 CHECK THE CLOCKSPRING

• Remove the driver side air bag. Refer to Section 501-20B.• Disconnect: Horn Switch Wiring Harness Connector.

(Continued)


310-03-13 310-03-13Speed Control




B16 CHECK THE CLOCKSPRING (Continued)

• Measure the resistance between the clockspring C218b pin 4,circuit 151, (component side) and the upper clockspring pin 3,circuit 151, (component side); and measure the resistancebetween the clockspring C218b pin 5, circuit 848, (componentside) and the upper clockspring pin 2, circuit 848, (componentside).

YesGO to B17.

NoINSTALL a new clockspring. REFER toSection 501-20B. CLEAR the DTCs.


B17 CHECK THE HORN SWITCH WIRING HARNESS

• Disconnect: Speed Control Switches. Yes• Inspect the horn switch wiring harness for shorts, opens or any INSTALL a new speed control switch.

damage. REFER to Speed Control Switch — With• Is the horn switch wiring harness OK? Remote Audio/Climate Control or Speed

Control Switch — Without RemoteAudio/Climate Control in this section.CLEAR the DTCs. REPEAT the self-test.

NoREPAIR or INSTALL a new horn switchwiring harness. CLEAR the DTCs.REPEAT the self-test.

B18 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR SHORTTO POWER

• Key in OFF position.• Disconnect: Clockspring C218b.• Key in ON position.• Measure the voltage between the PCM C175b pin 37, circuit

151 (LB/BK), harness side and ground; and between the PCMC175b pin 17, circuit 848 (DG/OG), harness side and ground.

YesREPAIR the circuit in questions. CLEARthe DTCs. REPEAT the self-test.


B19 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR SHORTTO GROUND


(Continued)


310-03-14 310-03-14Speed Control




B19 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR SHORTTO GROUND (Continued)

• Measure the resistance between the PCM C175b pin 37, circuit151 (LB/BK), harness side and ground; and between the PCMC175b pin 17, circuit 848 (DG/OG), harness side and ground.

YesGO to B20.


• Are the resistances greater than 10,000 ohms? REPEAT the self-test.

B20 CHECK FOR CORRECT PCM OPERATION

• Disconnect all the PCM connectors. Yes• Check for: INSTALL a new PCM. REFER to Section

303-14. CLEAR the DTCs. REPEAT the• corrosionself-test.• damaged pins

• pushed-out pins No• Connect all PCM connectors and make sure they are seated The system is operating correctly at this

correctly. time. Concern may have been caused by• Operate the system and verify the concern is still present. a loose or corroded connector. CLEAR the• Is the concern still present? DTCs. REPEAT the self-test.

PINPOINT TEST C: SPEED CONTROL DOES NOT DISENGAGE WHEN THE BRAKES ARE APPLIED


C1 CHECK THE BRAKE PEDAL POSITION (BPP) INPUT TO PCM

• Key in ON position. Yes• Monitor the PCM PID BPP SW while applying and releasing GO to C2.

the brake pedal. No• Do the PIDs agree with the brake pedal position? GO to Pinpoint Test F.

C2 CHECK FOR CORRECT PCM OPERATION

• Key in OFF position.• Disconnect all the PCM connectors. Yes• Check for: INSTALL a new PCM. REFER to Section




PINPOINT TEST D: THE SPEED CONTROL SWITCHES ARE INOPERATIVE


D1 CHECK FOR CONTINUITY

• Key in OFF position.• Disconnect: PCM C175b.

(Continued)


310-03-15 310-03-15Speed Control


PINPOINT TEST D: THE SPEED CONTROL SWITCHES ARE INOPERATIVE (Continued)


D1 CHECK FOR CONTINUITY (Continued)

• Measure the resistance between the PCM C175b pin 37, circuit151 (LB/BK), harness side and the PCM C175b pin 17, circuit848, (DG/OG), harness side.

YesGO to D2.

No• Is the resistance between 4,085 and 4,515 ohms? GO to D3.

D2 CHECK THE SPEED CONTROL SWITCHES

• Measure the resistance between the PCM C175b pin 37, circuit151 (LB/BK), harness side and the PCM C175b pin 17, circuit848, (DG/OG), harness side while pressing the switches.

Speed Control Switch with remote audio/climate control

Speed Control ActuatorSwitch Resistance Value

SET- Between 285 and 315 ohms

SET+ Between 570 and 630 ohms

Resume Between 1,055 and 1,165 ohms

On Between 1,995 and 2,205 ohms

Off Less than 5 ohms

YesGO to D6.

NoINSTALL a new speed control switch.REFER to Speed Control Switch — WithRemote Audio/Climate Control or SpeedControl Switch — Without RemoteAudio/Climate Control in this

• Are the speed control actuator switch resistances values section.CLEAR the DTCs. REPEAT theOK? self-test.

D3 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR OPEN

• Disconnect: Clockspring C218b.

(Continued)


310-03-16 310-03-16Speed Control




D3 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR OPEN(Continued)

• Measure the resistance between the PCM C175b pin 37, circuit151 (LB/BK), harness side and the clockspring C218b pin 4,circuit 151 (LB/BK), harness side; and measure the resistancebetween the PCM C175b pin 17, circuit 848 (DG/OG), harnessside and the clockspring C218b pin 5, circuit 848 (DG/OG),harness side.

YesGO to D4.



D4 CHECK THE CLOCKSPRING

• Remove the driver side air bag. Refer to Section 501-20B.• Disconnect: Horn Switch Wiring Harness Connector.• Measure the resistance between the clockspring C218b pin 4,

circuit 151, (component side) and the upper clockspring pin 3,circuit 151, (component side); and measure the resistancebetween the clockspring C218b pin 5, circuit 848, (componentside) and the upper clockspring pin 2, circuit 848, (componentside).

YesGO to D5.

NoINSTALL a new clockspring. REFER toSection 501-20B. CLEAR the DTCs.


D5 CHECK THE HORN SWITCH WIRING HARNESS

• Disconnect: Speed Control Switches. Yes• Inspect the horn switch wiring harness for shorts, opens or any INSTALL a new speed control switch.

damage. REFER to Speed Control Switch — With• Is the horn switch wiring harness OK? Remote Audio/Climate Control or Speed

Control Switch — Without RemoteAudio/Climate Control in this section.CLEAR the DTCs. REPEAT the self-test.

NoREPAIR or INSTALL a new horn switchwiring harness. CLEAR the DTCS.REPEAT the self-test.

(Continued)


310-03-17 310-03-17Speed Control




D6 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR SHORTTO POWER

• Key in OFF position.• Disconnect: Clockspring C218b.• Key in ON position.• Measure the voltage between the PCM C175b pin 37, circuit


YesREPAIR the circuit in questions. CLEARthe DTCs. REPEAT the self-test.

No• Is any voltage present? GO to D7.

D7 CHECK CIRCUIT 151 (LB/BK) AND 848 (DG/OG) FOR SHORTTO GROUND

• Key in OFF position.• Disconnect: Clockspring C218b.• Key in ON position.• Measure the resistance between the PCM C175b pin 37, circuit


YesREPAIR the circuit. CLEAR the DTCs.REPEAT the self-test.

No• Is the resistance less than 5 ohms? GO to D8.

D8 CHECK FOR CORRECT PCM OPERATION






310-03-18 310-03-18Speed Control


PINPOINT TEST E: SPEED CONTROL IS INOPERATIVE — FLASH WITH LAST SWITCH PRESSED ANDNO DYNAMIC PULL OCCURS AT THROTTLE



E1 CHECK THE SPEED CONTROL CABLE

• Disconnect the speed control cable at the throttle body. Yes• Check the speed control cable slack by pulling the speed control GO to E2.

cable end taut from within the speed control cable housing. No• Is the speed control cable slack greater than 0 mm (0 in) INSTALL a new speed control cable.

and less than 0.24 in (6 mm) ? REFER to Speed Control Cable in thissection. CLEAR the DTCs. REPEAT theself-test.

E2 CHECK FOR DAMAGE, STICKING OR BINDING SPEEDCONTROL CABLE

• Disconnect the speed control cable from the speed control Yesactuator. GO to E3.

• Check the speed control cable for damage, sticking or binding. No• Is the speed control cable OK? INSTALL a new speed control cable.

REFER to Speed Control Cable in thissection. CLEAR the DTCs. REPEAT theself-test.

E3 CHECK THE SPEED CONTROL ACTUATOR OUTPUT

• Key in ON position. Yes• Check the speed control actuator pulley for movement while REFER to the Powertrain

triggering the on-demand self-test. Control/Emissions Diagnosis (PC/ED)• Does the speed control actuator pulley move? manual.

NoGO to E4.

E4 CHECK THE SPEED CONTROL ACTUATOR

• Key in OFF position.• Disconnect: Speed Control Actuator C122.• Measure the resistance between the speed control actuator pins

(component side) as follows:

Speed Control Speed ControlActuator Actuator Expected Value

Pin 1 Pin 2 Between 2 and 3ohms

Pin 1 Pin 3 Between 2 and 3ohms

Pin 1 Pin 4 Between 2 and 3 YesGO to E5.ohmsNo

Pin 5 Pin 6 Between 20 and 30 INSTALL a new speed control actuator.ohms REFER to Speed Control Actuator in this

section. CLEAR the DTCs. REPEAT the• Are the resistances OK? self-test.

E5 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORSHORT TO POWER

• Disconnect: PCM C175b.• Key in ON position.• Measure the voltage between the speed control actuator C122,

harness side and ground as follows:

(Continued)


310-03-19 310-03-19Speed Control


PINPOINT TEST E: SPEED CONTROL IS INOPERATIVE — FLASH WITH LAST SWITCH PRESSED ANDNO DYNAMIC PULL OCCURS AT THROTTLE (Continued)


E5 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORSHORT TO POWER (Continued)

Speed Control Actuator C122 Circuit

Pin 2 1926 (VT/YE)

Pin 3 1925 (PK/BK)

Pin 4 1924 (DG/WH)

Pin 5 1927 (TN)

YesREPAIR the circuit(s). CLEAR the DTCs.REPEAT the self-test.

No• Is any voltage present? GO to E6.

E6 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORAN OPEN CIRCUIT

• Key in OFF position.• Measure the resistance between the PCM C175b, harness side

and the speed control actuator C122, harness side as follows:

Speed controlPCM C175b actuator C122 Circuit

Pin 12 Pin 2 1926 (VT/YE)

Pin 24 Pin 3 1925 (PK/BK)

YesPin 35 Pin 4 1924 (DG/WH)GO to E7.

Pin 26 Pin 5 1927 (TN) NoREPAIR the circuit(s). CLEAR the DTCs.


E7 CHECK THE VOLTAGE DROP ON THE SPEED CONTROLACTUATOR CIRCUITS

• Measure the voltage drop on the speed control actuator circuits.

Speed Control Actuator Circuit

C122-2 1926 (VT/YE)

C122-3 1925 (PK/BK)

C122-4 1924 (DG/WH)YesGO to E8.C122-5 1927 (TN)No

• Is the voltage drop less than 0.3 volts? REPAIR the circuit. REPEAT the self-test.

(Continued)


310-03-20 310-03-20Speed Control




E8 CHECK THE SPEED CONTROL ACTUATOR CIRCUITRY FORSHORT TO GROUND

• Measure the resistances between the PCM C175b, harness sideand ground as follows:

PCM C175b Circuit

Pin 26 1927 (TN)

Pin 35 1924 (DG/WH)

Pin 24 1925 (PK/BK)

Pin 12 1926 (VT/YE)

YesGO to E9.

NoREPAIR the circuit(s). CLEAR the DTCs.

• Are the resistances greater than 10,000 ohms? REPEAT the self-test.

E9 CHECK CIRCUIT 1928 (RD/WH) FOR AN OPEN

• Key in ON position.• Measure the voltage between the speed control actuator C122

pin 1, circuit 1928 (RD/WH), harness side and ground.

YesGO to E10.



E10 CHECK THE VOLTAGE DROP ON CIRCUIT 1928 (RD/WH)

• Measure the voltage drop on the speed control actuator C122 Yespin 1, circuit 1928 (RD/WH). GO to E11.


E11 CHECK THE DEACTIVATOR SWITCH CIRCUITRY FOR ANOPEN


(Continued)


310-03-21 310-03-21Speed Control




E11 CHECK THE DEACTIVATOR SWITCH CIRCUITRY FOR ANOPEN (Continued)

• Measure the voltage between the speed control actuator C122pin 6, circuit 307 (BK/YE), harness side and ground.

YesGO to E12.



E12 CHECK THE VOLTAGE DROP ON CIRCUIT 307 (BK/YE)

• Measure the voltage drop on the speed control actuator C122 Yespin 6, circuit 307 (BK/YE). INSTALL a new speed control actuator.

• Is the voltage drop less than 0.3 volts? REFER to Speed Control Actuator in thissection. CLEAR the DTCs. REPEAT theself-test.

NoREPAIR the circuit. REPEAT the self-test.

PINPOINT TEST F: FLASH CODE 2 —BRAKE PEDAL POSITION (BPP) SWITCH CIRCUIT FAILURE


F1 MONITOR THE PCM PID BPP SW

• Key in ON position. Yes• Monitor the PCM BPP PID while applying and releasing the GO to F4.

brake pedal. No• Does the PCM BPP PID agree with the brake pedal position GO to F2.

F2 CHECK CIRCUIT 729 (RD/WH)

• Key in OFF position.• Disconnect: BPP Switch C278.• Measure the voltage between the BPP C278 pin 5, circuit 729

(RD/WH), harness side and ground.

YesGO to F3.



F3 CHECK CIRCUIT 810 (RD/LG)


(Continued)


310-03-22 310-03-22Speed Control


PINPOINT TEST F: FLASH CODE 2 —BRAKE PEDAL POSITION (BPP) SWITCH CIRCUIT FAILURE(Continued)


F3 CHECK CIRCUIT 810 (RD/LG) (Continued)

• Disconnect: ABS Module C135.• Measure the resistance between the BPP C278 pin 6, circuit

810 (RD/LG), harness side and ABS C135 pin 41, circuit 810(RD/LG), harness side.

YesINSTALL a new BPP switch. REFER toSection 417-01. CLEAR the DTCs.REPEAT the self-test.


• Is the resistance less than 5 ohms? REPEAT the self-test.

F4 CHECK FOR CORRECT PCM OPERATION



• pushed-out pins No• Connect all the PCM connectors and make sure they seat The system is operating correctly at this


PINPOINT TEST G: FLASH CODE 3—DEACTIVATOR SWITCH CIRCUIT FAILURE



G1 CHECK CIRCUIT 307 (BK/YE) FOR VOLTAGE

• Key in OFF position.• Disconnect: PCM C175b.• Measure the voltage between the PCM C175b pin 15, circuit

307 (BK/YE), harness side and ground.

YesGO to G2.

No• Is the voltage greater than 10 volts?? GO to G3.

(Continued)


310-03-23 310-03-23Speed Control


PINPOINT TEST G: FLASH CODE 3—DEACTIVATOR SWITCH CIRCUIT FAILURE (Continued)


G2 CHECK THE VOLTAGE DROP ON CIRCUIT 307 (BK/YE)

• Measure the voltage drop on the speed control actuator C122-6, Yescircuit 307 (BK/YE). GO to G5.


G3 CHECK CIRCUIT 729 (RD/WH)

• Key in OFF position.• Disconnect: Deactivator Switch C277.• Measure the voltage between the deactivator switch C277 pin 1,

circuit 729 (RD/WH), harness side and ground.

YesGO to G4.

No• Is the voltage greater than 10 volts? REPAIR the circuit. REPEAT the self-test.

G4 CHECK CIRCUIT 307 (BK/YE)

• Key in OFF position.• Disconnect: PCM C175b.• Disconnect: Speed Control Actuator C122.• Measure the resistance between the deactivator switch C277 pin

2, circuit 307 (BK/YE), harness side and the PCM C175b pin 15,circuit 307 (BK/YE), harness side; and between the deactivatorswitch C277 pin 2, circuit 307 (BK/YE), harness side.

YesINSTALL a new speed control deactivatorswitch. REFER to Speed ControlDeactivator Switch in this section.REPEAT the self-test.

NoREPAIR the circuit in question. REPEAT

• Are the resistances less than 5 ohms? the self-test.

G5 CHECK FOR CORRECT PCM OPERATION

• Disconnect all the PCM connectors.• Check for: Yes

INSTALL a new PCM. REFER to Section• corrosion303-14. REPEAT the self-test.• damaged pins

• pushed-out pins No• Connect all the PCM connectors and make sure they seat The system is operating correctly at this

correctly. time. Concern may have been caused by• Operate the system and verify the concern is still present. a loose or corroded connector. REPEAT• Is the concern still present? the self-test.


DIAGNOSIS AND TESTINGww2.justanswer.com/uploads/s420/2011-11-10_005236_03_expediti… · 2011-11-10...

Documents

Transcript of DIAGNOSIS AND TESTINGww2.justanswer.com/uploads/s420/2011-11-10_005236_03_expediti… · 2011-11-10...