Diagnostic Test

CHECK IF TCM IS FLASHABLE
1. With the scan tool, record the vehicles TCM and PCM/ECM part numbers.
2. Verify the model year and make of both the TCM and ECM/PCM part numbers.
3. Flash and program the controller(s) with the correct software that corresponds with year and make of the vehicle.
  Were you able to update (flash) the controller(s) successfully to the proper software levels?
  
  Yes
  - Test Complete.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 and program the TCM in accordance with the Service Information.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .