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Content .. 1905 1906 1907 1908 ..
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 DTCS ENGINE DTCS TRANSMISSION CONTROL MODULE Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Diagnostic Test 1. CHECK IF FCM CAN BUS DTC’S ARE PRESENT With the scan tool, read FCM DTCs. Are there any FCM CAN BUS DTC’s present? Yes >> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag- nose the appropriate symptom. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/ 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. (Refer to 21 - TRANSMISSION/ 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 Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/ 21 - 162 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS LX |