Diagnostic Test

CHECK FOR BCM CAN BUS DTCS 

1. With the scan tool, read BCM DTCs.

   Are there any BCM CAN BUS DTCS present?

   Yes 

   • Refer to DIAGNOSTIC CODE INDEX and perform the appropriate symptom.
   • Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to 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.
   • Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST  .