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U0100-LOST COMMUNICATION WITH ECM/PCM (CONTINUED) For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE- For a complete wiring diagram Refer to Section 8W Theory of Operation The Transmission Control Module (TCM) receives information from the Engine, Anti-lock Brake System, and the • When Monitored: • Set Condition: Possible Causes TRANSMISSION CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Diagnostic Test 1. CHECK THE FCM FOR CAN C BUS COMMUNICATION DTCS With the scan tool, check for FCM DTCs. Does the FCM report the DTC U0001-CAN C BUS or U0100-LOST COMMUNICATION WITH ECM/PCM? Yes >> Refer to 8-ELECTRICAL - ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS cate- gory and perform the appropriate symptom. Perform the diagnostic procedure for U0001-CAN C BUS Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 2 21 - 610 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS WK |