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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 Ignition on, engine not running. t, read Engine DTCs. Are there any Engine Temperature Sensor DTCs present? All Yes → Refer to the Driveability category and perform the appropriate symptom. No → Go To 4 4 Replace and program the ECM per the Service Information. t, erase Transmission DTCs. Start the engine. t, read Transmission DTCs. Did the DTC, ENGINE TEMP MESSAGE, reset? All Yes → Replace the Transmission Control Module. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. No → Test complete. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. 65 TRANSMISSION - NAG1 ENGINE TEMP MESSAGE — Continued |