Diagnostic Test
WARNING: This page is about a different variant/trim than selected.
- CHECK FOR CAN BUS DTCS
- With the scan tool, check for CAN BUS DTCs.
Are there any CAN BUS DTCs present?
Yes
- Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
No
- Go to step 2
- With the scan tool, check for CAN BUS DTCs.
- CHECK IF ECM/PCM DTCS ARE PRESENT
- With the scan tool, read engine DTCs.
Are there any engine DTCs present?
Yes
- For Gas engine. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing and perform the appropriate diagnostic procedure.
- Perform the 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 the NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
- With the scan tool, read engine DTCs.