DTC U0402:68 [ELECTRONIC 4WD CONTROL SYSTEM]


id0302a6201300

DTC U0402:68

Abnormal message from TCM

DETECTION CONDITION
•  Correct data cannot be received from TCM
FAIL-SAFE FUNCTION
•  Control maintained by the specified data.
POSSIBLE CAUSE
•  TCM malfunction
•  4WD CM malfunction
SYSTEM WIRING DIAGRAM
Not applicable


Diagnostic Procedure

Step

Inspection

Results

Action

1
INSPECT FOR TCM MALFUNCTION
•  Is the DTC displayed?
Yes
Go to applicable DTC inspection.
DTC troubleshooting completed, then go to the next step.
No
Go to the next step.
2
VERIFY THAT THE SAME DTC IS NOT PRESENT
•  Clear the DTCs from the memory.
•  Using the M-MDS, perform the 4WD control module DTC inspection.
•  Is the same DTC present?
Yes
Replace the 4WD CM, then go to the next step.
No
Go to the next step.
3
VERIFY THAT NO OTHER DTCS ARE PRESENT
•  Are any other DTCs output?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.