Jeep Grand Cherokee WK. Manual — part 1544
U0401–IMPLAUSIBLE DATA RECEIVED FROM ECM (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with
PCM condition present, and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module is receiving implausible data for pedal position, engine RPM, torque, or engine
coolant temperature from the PCM.
Possible Causes
POWERTRAIN DTCS PRESENT
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
POWERTRAIN DTCS PRESENT
Ignition on.
With the scan tool, select View DTCs in the Powertrain Control Module.
Are there any DTCs present?
Yes
>> Refer to the symptom list and perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
U0402–IMPLAUSIBLE DATA RECEIVED FROM TCM (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with
TCM condition present, and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module is receiving implausible data for gear or PRNDL position from the TCM.
Possible Causes
TRANSMISSION DTCS PRESENT
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
TRANSMISSION DTCS PRESENT
Ignition on.
With the scan tool, select View DTCs in the Transmission Control Module.
Are there any DTCs present?
Yes
>> Refer to the symptom list and perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
21 - 987
U0415–IMPLAUSIBLE DATA RECEIVED FROM ABS (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with
ABS condition present, and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module is receiving implausible data for vehicle speed, wheel speed, brake switch
status, longitudinal acceleration, yaw rate, or lateral acceleration from the ABS controller.
Possible Causes
ANTILOCK BRAKE SYSTEM DTCS PRESENT
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
ABS DTCS PRESENT
Ignition on.
With the scan tool, select View DTCs in the Antilock Brake Controller.
Are there any DTCs present?
Yes
>> Refer to the symptom list and perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
WK
U0429–IMPLAUSIBLE DATA RECEIVED FROM SCM (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with
SCM condition present, and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module is receiving implausible data for sensor status from the SCM.
Possible Causes
STEERING COLUMN CONTROL MODULE DTCS PRESENT
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
STEERING COLUMN CONTROL MODULE DTCS PRESENT
Ignition on.
With the scan tool, select View DTCs in the Steering Column Control Module.
Are there any DTCs present?
Yes
>> Refer to the symptom list and perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
WK
TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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