P0073

Test 1 - Test 2:

Test 3 - Test 6:

SYMPTOM
P0073-AMBIENT TEMP SENSOR CIRCUIT HIGH

WHEN MONITORED
The ignition key on.

SET CONDITION
The Ambient Temperature Sensor voltage is greater than 4.94 volts at the PCM for 4.8 seconds. Three good trips to clear the MIL.

POSSIBLE CAUSES
- AAT sensor voltage above 4.8 volts
- AAT sensor
- (G31) AAT signal circuit shorted to battery voltage
- (G31) AAT signal circuit open
- (K900) Sensor ground circuit open
- PCM