P0072

Test 1 - Test 3:

Test 4 - Test 5:

SYMPTOM
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) AAT signal circuit shorted to the (K900) sensor ground
- PCM