Diagnostic Test
- CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM NOTE:
This DTC must be active for the results of this test to be valid.
- Ignition on, engine not running.
- With the scan tool, record and erase DTCs.
- Cycle the ignition switch from off to on.
- With the scan tool, read DTCs.
Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?
Yes
- Go To 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the AWD CONTROL MODULE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- CHECK IF TIPM CAN BUS DTCs ARE PRESENT
- With the scan tool, read TIPM DTCs.
Are there any TIPM CAN BUS DTCs present?
Yes
- Perform the appropriate symptom. Refer to the DIAGNOSTIC CODE INDEX article .
- Perform AWD Control Module VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Go To 3
- With the scan tool, read TIPM DTCs.
- CHECK IF ENGINE DTCs ARE PRESENT
- With the scan tool, read Engine DTCs.
Are there any Engine DTCs present?
Yes
- Perform the appropriate symptom. Refer to the DTC INDEX article .
- Perform AWD CONTROL MODULE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Using the schematics as a guide, check the AWD Control Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the AWD Control Module in accordance with the Service Information.
- Perform AWD CONTROL MODULE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- With the scan tool, read Engine DTCs.