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 Temperture Sensor is less than .0392 of a volt at the PCM. One
Trip Fault.
POSSIBLE CAUSES
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 0.3 VOLTS
AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE
(K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(K25) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND CIRCUIT
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read the Ambient Air Temperature Sensor voltage.
Is the voltage below 0.3 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 above 1.0 volt?
All
Yes → Replace the Ambient Air Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
3 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K25) AAT Signal circuit in the
Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the short to ground in the (K145) AAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
49
DRIVEABILITY - NGC
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