6-40
GROUP 4 MECHATRONICS SYSTEM
CN-75
2
1
EPPR VALVE
8
CN-50
24
28
CN-47
1
2
1
2
CN-19
36
2
1
CN-19BCONTROLLER
FUSE
NO.11
RESISTOR
Wiring diagram
1. ALL ACTUATORS SPEED ARE SLOWBoom, Arm, Bucket, Swing and travel speed are slow, but engine speed is good.Spec : M-mode 1850 50rpm H -mode 1850 50rpm S-mode 1750 50rpmBefore carrying out below procedure, check all the related connectors are properly inserted.
IINSPECTION PROCEDURE
11)
SPEC : 200~450mASee TEST 2
SPEC : 5~20kgf/cm2See TEST 3
SPEC : 17.51(20C)See TEST 1
Check if EEr : 03on the cluster
Check electric current at EPPRvalve
Check resistance at EPPR valve
Check pressure at EPPR valve
YES
YES
YES
YES
NO
NO
NONO
Cause Remedy
Defectivehydraulic system
DefectiveEPPR valve
Defective CPUcontroller
Short circuit orpoor connectionbetween CN-50 -CN-75
Defective EPPRvalve
Replace
Replace
Check & repairwire harness orbetween CN-50-CN-75
Replace
2907A6MS01
6-41
Test 1 : Check resistance at connectorCN-75.
Starting key OFF.Disconnect connector CN-75 from EPPRvalve at main hydraulic pump.Check resistance between 2 lines asfigure.
(1)
TTest 2 : Check electric current at EPPRvalve.
Install multimeter as figure.Start engine.Set the accel dial at "10"(MAX)Set S-mode and cancel auto decel mode.If tachometer show approx 175050rpmcheck electriccurrent.
(2)
SPEC : 17.51(20C)
SPEC : 200~450mA(S mode)
6-38(2)
6-38(3)
SPEC : 5~20kgf/cm2(70~280psi)Test 3 : Check pressure at EPPR valve.Remove plug and connect pressuregauge as figure.Gauge capacity : 0 to 40~50kgf/cm2
(0 to 570~710psi)Start engine.Set the accel dial at "10"(Max).Set S-mode and cancel auto decel mode.If tachometer show approx 175050rpmcheck pressure.If pressure is not correct, adjust it.After adjust, test the machine.
((3)
6-39(1)
6-42
Wiring diagram
CN-75
2
1
EPPR VALVE
8
CN-50
24
28
CN-47
1
2
1
2
CN-19
36
2
1
CN-19BCONTROLLER
FUSE
NO.11
RESISTOR
2. ENGINE STALLBefore carrying out below procedure, check all the related connectors are properly inserted.INSPECTION PROCEDURE1)
YES
SPEC : 200~450mASee TEST 4
SPEC:5~20kgf/cm2See TEST 5
SPEC : 17.51(20C)See TEST 1
Check electriccurrent at EPPRvalve
Check pressureat EPPR Valve
Check resistancebetween CN-50(8) - (36)
Cause Remedy
Not enough enginepower
Defective EPPRvalve
Short circuit orpoor connectionbetweenCN-50 - CN-75
Defective EPPRvalve
Contact cumminsengine dealer
Replace
Check and repairwire harness
Replace
YES
YES
NO
NO
NO
2907A6MS01
6-43
TEST PROCEDURE
Test 4 : Check electric current at EPPRvalve at S-mode
Install multimeter as figure.Start engine.Set the accel dial at "10"(max)Set S-mode with 175050rpm.Check electric current.
CN-75
Multimeter
EPPR VALVE
CN-75
Supply line, pilot press
Pressure adjustingscrew locknut
(1)
22)
Test 5 : Check pressure at EPPR valve atS-mode
Connect pressure gauge at EPPR valve.Start engine.Set the accel dial at "10"(max)Set S-mode with 175050rpm.Operate bucket lever completely push orpull.Hold arm lever at the end of stroke.Check pressure at relief position.
(2)
SPEC : 200~450mA
SPEC : 5~20kgf/cm2(70~280psi)
6-44(1)
6-44(2)
6-44
3. MALFUNCTION OF CLUSTER OR MODE SELECTION SYSTEMBefore carrying out below procedure, check all the related connectors are properly inserted.INSPECTION PROCEDURE
11)
See if Co : Eron the cluster
See if all lampsoff in the CPUcontroller case
Check connectionbetween CN-51(29) - CN-50(10)or CN-50(30) -CN-5(11)
Cause Remedy
No power supply tothe CPU controller
CPU failure
Cluster failure
No connection
Check fuse
Replace
Replace
Check and repair
CLUSTERPOWER IG(24V)GNDRXTX 4
CN-56 CN-5
3
CN-50
CPU CONTROLLER
11
10
30
29
FUSE
NO.11(CPU)
28
24
RY G
RY G
RY G
KEY OFF
Wiring diagram
YES
YES
YES
NO
OK
NONO
NO
36076MS02
6-45
4. AUTO DECEL SYSTEM DOES NOT WORKBefore carrying out below procedure, check all the related connectors are properly inserted.INSPECTION PROCEDURE
11)
Wiring diagram
Cause Remedy
Defective CPUcontroller
Short circuit orpoor connectionvetween CN-51(1),(13)- pressureswitches
Defective autodecel pressureswitch
Replace
Replace or repair
Replace
CPU CONTROLLER
CN-51
1Pb
Pa
AUTO DECEL PRESSURE SWITCH
CD-7
CD-6
1
2
1
2
13
SPEC :Actuator operating :
11~13VActuator stop :0~2V
See TEST 6See TEST 7
Check resistancebetween CN-51(1)-GND andCN-51(13)-GND
NO
NO
YES
R29076MS10
6-46
TEST PROCEDURE
Test 6 : Check voltage at CN-51(1) andground.
Prepare 1 piece of thin sharp pin, steel orcopper.Starting key ON.Insert prepared pin to rear side ofconnectors : One pin to (1) of CN-51.Check voltage as figure.
Test 7 : Check voltage at CN-51(13)andground.
Prepare 1 piece of thin sharp pin, steel orcopperStarting key ON.Insert prepared pin to rear side ofconnectors : One pin to (13) of CN-51Check voltage as figure.
CN-50
Y R G
Multimeter
CN-51 1122536
24
CPUCONTROLLER
CN-51
PIN
Ground
Multimeter
CN-51 1122536
1324
Ground
(1)
(2)
22) SPEC : Actuator stop : 11~13VActuator operating : 0~2V
R29076MS11
6-47
48
CN-50
25
CONTROLLER
27
26
CN-3
5
7
6
ECM
37
47
CN-174
RESISTORABC
A
BCN-99
RESISTORABC
A
B
Wiring diagram
SPEC : Below 10KEY OFF
SPEC : Below10KEY OFFCheck resistance
between CN -51(25) - ECM(48)
Check resistancebetween CN-50(26) - ECM(47)
Defective cluster orCPU controller orECM
Poor connectionbetween CN-51(26) - ECM(47)
Poor connectionbetween CN-51(25) - ECM(48)
Repair or Replace
Repair
Repair
55. MALFUNCTION OF WARMING UPBefore carrying out below procedure, check all the related connectors are properly inserted.INSPECTION PROCEDURE
1)
Cause Remedy
YES
YES
NO
NO
2907A6ES02
6-48
Wiring diagram
SPECKEY ON : 241VKEY OFF : 0VSee TEST 8
SPEC: 15-30See TEST 8
Is voltage betweenCN-88(2) -GNDnormal?
Resistancebetween CN-51(2)-GND normal?
Check resistancebetween CN-88(1) - (2)
Defective powermax. solenoid valve
Short circuit or poorconnectionbetween CN-51(2) -CS-29 and CN-50(3) -CN-88(1)
Short circuit or poorconnectionbetween CN-88(2)-battery relay(+)
Repair or replace
Repair or replace
Repair or replace
66. MALFUNCTION OF POWER MAXBefore carrying out below procedure, check all the related connectors are properly inserted.INSPECTION PROCEDURE1)
POWER MAX SOLENOID
CS-29
3
CN-50
CPU CONTROLLER
2
CN-51
POWER MAX SWITCH
2
1
CN-88
2
CN-4
FUSE
NO.25
2
1
1
Cause RemedyYES
YES
NO
NO
50076MS04
SPEC : Power max button pressed ON : 0Power max button released OFF : See Test 9
6-49
TEST PROCEDURE
Test 8: Check voltage between connectorCN-88 - GND.
Start key ON.Disconnect connector CN-88 from powermax solenoid valve.Check voltage as figure.
(1)
22)
Test 9 : Check resistance betweenconnector CN-51(2)-GND.
Starting key OFF.Remove CPU controller and disconnectconnector CN-51 from CPU controller.Check resistance as figure.
(2)
LH RCV-lever
Power max. switch
Power max.solenoid valve
CN-88
Multimeter
CN-88
CN-50
Y R G
CPUCONTROLLER
CN-51
Multimeter
CN-51212
2536
1324
Ground
SPEC : Key ON : 241VKey OFF : 0VResistance : 15~30
SPEC : Power max button pressed ON : 0Power max button released OFF :
R29076MS14
R29076MS15
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