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 Temperature Sensor is less than .04 of a volt at the PCM. One
Trip Fault.
POSSIBLE CAUSES
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW .04 VOLTS
AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE
(K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(K145) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND CIRCUIT
PCM
TEST ACTION APPLICABILITY
1 NOTE: After repairing this DTC, the AAT sensor value will not refresh until
either the ignition is OFF for more than 5 hours or the vehicle has been
driven at a speed greater than 20 MPH for more than 2 minutes.
Ignition on, engine not running.
With the DRBIIIt, read the Ambient Air Temperature Sensor voltage.
Is the voltage below .04 of a volt?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIIIt, read Ambient Air Temperature Sensor voltage.
Is the voltage between 4.8 and 5.2 volts?
All
Yes → Replace the Ambient Air Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
51
DRIVEABILITY - NGC
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