P0112

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The Intake Air Temperature (IAT) sensor is a thermistor that controls signal voltage to the Powertrain Control Module (PCM). When the air is cold, the sensor resistance is high, therefore the PCM will see a high signal voltage. As air warms, sensor resistance becomes less and voltage drops. This is a type B DTC.


CONDITIONS FOR SETTING THE DTC
- Engine coolant temperature less than 42.5°C (10°F).
- Intake air temperature greater than or equal to 151°C (3O4°F).
- Conditions met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
A possible poor performance problem may exist during cold weather operation.

CONDITIONS FOR CLEARING THE MIL/DTC
- The PCM will turn the MIL oft after three consecutive trips without a fault condition.
- A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (16O°F) that same ignition cycle.


DIAGNOSTIC AIDS
Check harness routing for a potential short to ground in the signal circuit. Scan Tool displays intake air temperature in degrees centigrade. Refer to Intermittents. A skewed sensor could result in poor driveability complaints.

TEST DESCRIPTION
Number(s) below refer to the Step number(s) on the Diagnostic Table.

2. This Step determines if P0112 is a hard failure or an intermittent condition.
3. This test will determine if the PCM can recognized an open sensor.