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P0073–AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (G31) AAT SIGNAL CIRCUIT OPEN (K900) SENSOR GROUND CIRCUIT OPEN AMBIENT AIR TEMPERATURE SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. AAT SENSOR VOLTAGE ABOVE 4.98 VOLTS Ignition on, engine not running. With a scan tool, read the Ambient Air Temperature Sensor voltage. Is the voltage above 4.98 volts? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. AAT SENSOR Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Connect a jumper wire between the (G31) AAT Signal circuit and the Ignition on, engine not running. With a scan tool, read AAT Sensor voltage. Is the voltage below 1.0 volt with the jumper wire installed? Yes >> Replace the Ambient Air Temperature Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 3 NOTE: Remove the jumper wire before continuing. 9 - 70 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |