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• When Monitored: • Set Condition: Possible Causes (G31) AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE (G931) AMBIENT AIR TEMP SENSOR GROUND CIRCUIT OPEN (G31) AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT OPEN AMBIENT AIR TEMPERATURE SENSOR TOTALLY INTEGRATED POWER MODULE Diagnostic Test 1. CHECK FOR ACTIVE DTC NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may With the scan tool, erase TIPM DTCs. Turn the ignition off for 10 seconds. Turn the ignition on. Monitor the scan tool for TIPM DTCs. Did this DTC set again? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. (G31) AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Disconnect the TIPM C4 harness connector. Remove the Main Relay. Connect a jumper wire between cavity B7 and cavity B9 of the Main Turn the ignition on. Measure the voltage on the (G31) Ambient Air Temperature Sensor Sig- NOTE: Remove the jumper wire. Is the voltage below 1.0 volt? Yes >> Go To 3 No >> Repair the (G31) Ambient Air Temperature Sensor Signal circuit for a short to voltage. Perform the ECM Verification Test Ver. 1 (Refer to 9 - PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 967 |