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Symptom: P0071-AMBIENT TEMP SENSOR PERFORMANCE When Monitored and Set Condition: P0071-AMBIENT TEMP SENSOR PERFORMANCE When Monitored: Engine off time is greater than 480 minutes. Ambient temperature is greater than 4°C (39°F). Set Condition: After a calibrated amount of cool down time, the PCM compares the ECT Sensor, IAT Sensor and the Ambient Air Temperature Sensor values. If the Ambient Air POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO (K25) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 1.0 VOLT (K25) AAT SIGNAL CIRCUIT OPEN (K4) SENSOR GROUND CIRCUIT OPEN (K25) AAT SIGNAL CIRCUIT SHORTED TO GROUND (K25) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND PCM LOW PCM HIGH TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 46 DRIVEABILITY - NGC |