Diagnostic Test
WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR FCM CAN BUS DTCS
- With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTCs present?
Yes
- Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
No
- Go to step 2
- With the scan tool, read FCM DTCs.
- CHECK IF ECM/PCM DTCS ARE PRESENT
- With the scan tool, read ECM/PCM DTCs.
Are there any ECM/PCM DTCs present?
Yes
- Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
No
- 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 and program the TCM in accordance with the Service Information.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
- With the scan tool, read ECM/PCM DTCs.