P0071

Test 1 - Test 2:

Test 3 - Test 7:

Test 8 - Test 9:

SYMPTOM
P0071-AMBIENT TEMP SENSOR PERFORMANCE

WHEN MONITORED
Engine off time is greater than 480 minutes and Ambient Temperature is greater than 4 deg C (39 deg 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. The Ambient Air Temperature Sensor value is not within -10 deg C (18 deg F) of the other two temperature sensor's. Two Trip Fault.

POSSIBLE CAUSES
- Good trip equal to zero
- (G31) AAT signal circuit shorted to battery voltage
- AAT sensor
- (G31) AAT signal circuit open
- (K900) Sensor ground circuit open
- (G31) AAT signal circuit shorted to ground
- (G31) AAT signal circuit shorted to (K900) sensor ground
- PCM