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Symptom: P0072-AMBIENT TEMP SENSOR CIRCUIT LOW When Monitored and Set Condition: P0072-AMBIENT TEMP SENSOR CIRCUIT LOW When Monitored: The ignition key on. Set Condition: Ambient Temperature Sensor is less than 0.039 of a volt at the PCM for 4.8 seconds. Three good trips to clear the MIL. POSSIBLE CAUSES AAT SENSOR VOLTAGE BELOW 0.3 OF A VOLT AAT SENSOR (G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND (G31) ATT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read the Ambient Temperature Sensor voltage. Is the voltage below 0.3 of a volt? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION Symptom (Diagnos- tic Procedure). 2 Turn the ignition off. t, read AAT Sensor voltage. Is the voltage above 4.6 volts? All Yes → Replace the Ambient Temperature Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 3 3 Turn the ignition off. All Yes → Repair the short to ground in the (G31) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 4 53 DRIVEABILITY - NGC |