Diagnostic Test
- CHECK FOR CAN BUS DTCS
- With the scan tool, check for CAN DTCs.
Are there any CAN BUS DTCs present?
Yes
- Refer to appropriate Diagnostic Code Index and perform the appropriate diagnostic procedure.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to Standard Procedure .
No
- Go to 2.
- With the scan tool, check for CAN DTCs.
- ELECTRONIC SHIFT MODULE DTCS PRESENT
- With the scan tool, read Final Drive Control Module (FDCM) DTCs.
Are there any FDCM DTCs present?
Yes
- Refer to FINAL DRIVE CONTROL MODULE (FDCM) - ELECTRICAL DIAGNOSTICS perform the appropriate diagnostic 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. Refer to Standard Procedure .
- With the scan tool, read Final Drive Control Module (FDCM) DTCs.