Diagnostic Test
- VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE:
For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.
NOTE:Make sure the battery is fully charged before proceeding.
- Turn the ignition on.
- With the scan tool, read active PCM DTCs.
Is this DTC active?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
- U0101-LOST COMMUNICATION WITH TCM ALSO SET
- With the scan tool continue reading DTCs.
Is the U0101-LOST COMMUNICATION WITH TCM also set?
Yes
- Perform the U0101 LOST COMMUNICATION WITH TCM diagnostic procedure. Refer to DIAGNOSIS AND TESTING .
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- With the scan tool continue reading DTCs.