Diagnostic Test
- CHECK FOR TIPM CAN BUS DTCS
- With the scan tool, read TIPM DTCs.
Are there any TIPM CAN BUS DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING for diagnostic procedures and other possible causes.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
No
- Go To 2.
- With the scan tool, read TIPM 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 3.7L - DIAGNOSTIC CODE INDEX and perform the appropriate symptom.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM in accordance with the Service Information.
- Refer to STANDARD PROCEDURE and perform the NAG1 TRANSMISSION VERIFICATION TEST.
- With the scan tool, read ECM/PCM DTCs.