Symptom:
P0112-INTAKE AIR TEMPERATURE SENSOR LOW
When Monitored and Set Condition:
P0112-INTAKE AIR TEMPERATURE SENSOR LOW
When Monitored: With the ignition on.
Set Condition: The IntakeAir Temperature (IAT) sensor voltage is less than 0.1 of a volt.
One trip Fault.
POSSIBLE CAUSES
IAT SENSOR VOLTAGE BELOW 0.1 VOLT
IAT SENSOR INTERNAL FAILURE
(K21) IAT SIGNAL SHORTED TO GROUND
(K21) IAT SIGNAL SHORTED TO (K167) SENSOR GROUND CIRCUIT
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read the IAT Sensor voltage.
Is the voltage below 0.1 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 IAT harness connector.
Ignition on, engine not running.
With the DRBIIIt, read IAT Sensor voltage.
Is the voltage between 4.8 and 5.2 volts?
All
Yes → Replace the IAT Sensor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
3 Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K21) IAT Signal circuit at the IAT
Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the short to ground in the (K21) IAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
64
DRIVEABILITY - NGC
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