Diagnostic Test
- CHECK IF CAN BUS DTCS ARE PRESENT
- With the scan tool, check for CAN DTCs.
Are there any CAN BUS DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
No
- Go To 2.
- With the scan tool, check for CAN DTCs.
- CHECK IF ENGINE DTCS ARE PRESENT
- With the scan tool, read Engine DTCs.
Are there any Engine DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
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.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
- With the scan tool, read Engine DTCs.