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U1401-IMPLAUSIBLE ENGINE SPEED SIGNAL RECEIVED (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 messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a • When Monitored: • Set Condition: Possible Causes FCM CAN BUS DTC’S PRESENT ENGINE MODULE DTC’S PRESENT TRANSMISSION CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Diagnostic Test 1. CHECK FOR FCM CAN BUS DTCS With the scan tool, read FCM DTCs. Are there any FCM CAN BUS DTC’s present? Yes >> Refer to 8-ELECTRICAL - ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS cate- gory and perform the appropriate symptom. No >> Go To 2 2. CHECK IF ENGINE DTC’S ARE PRESENT With the scan tool, read engine DTCs. Are there any engine DTC’s present? Yes >> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. 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 Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. 21 - 654 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS WK |