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Content .. 1907 1908 1909 1910 ..
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 CAN BUS DTC’S PRESENT HVAC DTC’S PRESENT TRANSMISSION CONTROL MODULE Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - 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. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/ No >> Go To 2 2. CHECK IF HVAC DTC’S ARE PRESENT With the scan tool, read HVAC DTCs. Are there any HVAC DTC’s present? Yes >> Refer to Section 24 - HVAC - ELECTRICAL DIAGNOSTICS category and perform the appropriate symp- tom. 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 - 170 AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS LX |