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Symptom: P0072-AMBIENT TEMP SENSOR LOW When Monitored and Set Condition: P0072-AMBIENT TEMP SENSOR LOW When Monitored: The ignition key on. Set Condition: Ambient Temperture Sensor is less than .0392 of a volt at the PCM. One Trip Fault. POSSIBLE CAUSES AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 0.3 VOLTS AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE (K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND (K25) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND CIRCUIT PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read the Ambient Air Temperature Sensor voltage. Is the voltage below 0.3 of a volt? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 2 Turn the ignition off. t, read Ambient Air Temperature Sensor voltage. Is the voltage above 1.0 volt? All Yes → Replace the Ambient Air 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 (K145) AAT Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 4 49 DRIVEABILITY - NGC |