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Theory of Operation The Electronic Shift Module (ESM) monitors ignition voltage. The DTC will set, if the monitored battery voltage rises • When Monitored: • Set Condition: Possible Causes CHARGING SYSTEM DTCS VEHICLE WAS JUMP STARTED INCORRECTLY ELECTRONIC SHIFT MODULE (ESM) Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Diagnostic Test 1. CHECK FOR CHARGING SYSTEM DTCS With the scan tool, read Engine DTCs. NOTE: This includes any one trip faults. Are there any Engine Charging System DTCs present? Yes >> Refer to the Engine category and perform the appropriate symptom. (Refer to 9 - ENGINE - DIAGNO- SIS AND TESTING) Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 2 2. VEHICLE WAS JUMP STARTED INCORRECTLY Verify if the vehicle was jump started by another vehicle using a 24-volt charging system or incorrectly jump started Was the vehicle jump started by another vehicle? Yes >> This is the cause of the DTC. Erase the DTC and return the vehicle to the customer. Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 3 3. ELECTRONIC SHIFT MODULE Reconnect all disconnected harness connectors. With the scan tool, erase ESM DTCs. Start the engine and raise the engine speed to 2000 RPM. With the scan tool, read ESM DTCs. Did the P0563-BATTERY VOLTAGE HIGH DTC reset? Yes >> Using the schematics as a guide, check the Electronic Shift Module (ESM) terminals for corrosion, dam- age, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Test Complete. 21 - 246 AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS LX |