Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK IF FCM CAN BUS DTC'S ARE PRESENT
With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTC's present?

Yes
1. Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .
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 DTC's present?

Yes
1. Refer to DTCS P0016 TO P0118, DIAGNOSTIC CODE INDEX, PRE-DIAGNOSTIC TROUBLESHOOTING, INTERMITTENT CONDITION and diagnose the appropriate symptom.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .
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 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION for the appropriate service procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .