Jeep Grand Cherokee WK. Manual — part 28
C141A-FRONT DIFFERENTIAL CONTROL CIRCUIT “CURRENT” PERFORMANCE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
The ignition on. No Solenoid DTCs present.
•
Set Condition:
The FDCM detects a current feedback when the solenoid is not active.
Possible Causes
WIRING HARNESS INSPECTION
FDCM
Diagnostic Test
1.
ACTIVE DTC
NOTE: You must diagnose any Solenoid circuit (Low or High) DTCs first if set along with this DTC before
continuing.
Ignition on, engine not running.
With the DRBIII
T
, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Go To 3
2.
WIRING HARNESS INSPECTION
Inspect the wiring harness from both solenoids to the FDCM. Ensure that the harness has routed correctly.
Inspect the FDCM harness connector and Differential Solenoid connectors. Ensure the terminals are clean and no
damage is present.
Was the wiring harness and connectors OK?
Yes
>> Repair as necessary.
Perform FDCM VERIFICATION TEST.
No
>> Replace the FDCM in accordance with the Service Manual.
Perform FDCM VERIFICATION TEST.
3.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
Using the DRBIII
T
, monitor the data related to this circuit while performing the wiggle test. Look for the data to
change or for the DTC to reset.
Were there any problems found?
Yes
>> Repair as necessary.
Perform FDCM VERIFICATION TEST.
No
>> Test Complete.
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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
WK
C141B—FRONT DIFFERENTIAL CLUTCH PERFORMANCE
WK
DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
3 - 11
C141B—FRONT DIFFERENTIAL CLUTCH PERFORMANCE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
The ignition on. No Solenoid DTCs present.
•
Set Condition:
The solenoid duty cycle is greater than 95% and the wheel slippage is greater than 50%.
Possible Causes
WIRING HARNESS INSPECTION
DIFFERENTIAL (MECHANICAL)
FRONT DIFFERENTANTIAL SOLENOID
Diagnostic Test
1.
ACTIVE DTC
NOTE: You must diagnose any Solenoid circuit (Low or High) DTCs first if set along with this DTC before
continuing.
Ignition on, engine not running.
With the DRBIII
T
, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Go To 4
2.
WIRING HARNESS INSPECTION
Inspect the wiring harness from both solenoids to the FDCM. Ensure that the harness has routed correctly.
Inspect the FDCM harness connector and Differential Solenoid connectors. Ensure the terminals are clean and no
damage is present.
Was the wiring harness and connectors OK?
Yes
>> Repair as necessary.
Perform FDCM VERIFICATION TEST.
No
>> Go To 3
Perform FDCM VERIFICATION TEST.
3.
INSPECTION DIFFERENTIAL
Ensure the Differential is operating properly. Refer to 3–Differential & Driveline Service Information.
Inspect the Differential for external fluid leaks. Repair as necessary, refer to 3–Differential & Driveline Service Infor-
mation.
Is the Differential operating properly?
Yes
>> Replace the Front Differential Solenoid.
Perform FDCM VERIFICATION TEST.
No
>> Repair as necessary.
Perform FDCM VERIFICATION TEST.
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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
WK
C141B—FRONT DIFFERENTIAL CLUTCH PERFORMANCE (CONTINUED)
4.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
Using the DRBIII
T
, monitor the data related to this circuit while performing the wiggle test. Look for the data to
change or for the DTC to reset.
Were there any problems found?
Yes
>> Repair as necessary.
Perform FDCM VERIFICATION TEST.
No
>> Test Complete.
WK
DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
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