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TEST ACTION APPLICABILITY 2 Ignition on, engine not running. t, read Transmission DTCs. NOTE: If the DTC CAN BUS CIRCUIT is present, perform diagnostics on All Yes → Refer to the Transmission category and perform the appropriate symptom. No → Go To 3 3 Turn the ignition off to the lock position. All Yes → Repair the CAN C BUS + or - circuit for an open. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. No → Go To 4 4 Ignition on, engine not running. t, read Engine DTCs. Are there any performance or bus related Engine DTCs present? All Yes → Refer to the Powertrain category and perform the appropriate symptom. No → Go To 5 5 Replace and program the PCM/ECM per the Service Information. t, erase Transmission DTCs. Start the engine. t, read Transmission DTCs. Did the DTC, ENGINE CAN MESSAGE MISSING, reset? All Yes → Go To 6 No → Test Complete Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. 6 If there are no possible causes remaining, view repair. All Repair Replace the Transmission Control Module. 69 TRANSMISSION - NAG1 ENGINE TORQUE REDUCTION — Continued |