Diagnostic Test

1) CHECK FOR FCM CAN BUS DTCS
With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTCs present?

Yes
1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and perform the appropriate symptom(s).
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
No
1. Go To step 2).
2) CHECK IF ENGINE DTC'S ARE PRESENT
With the scan tool, read engine DTCs.

Are there any engine DTCs present?

Yes
1. DIAGNOSTIC CODE INDEX and perform the appropriate symptom(s).
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
No
1. Using the schematics as a guide, check the Transmission Control Module (TCM) 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 TCM per the Service Information. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - REMOVAL)
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .