DTC P0112 - IAT SENSOR CIRCUIT LOW VOLTAGE Pontiac Firebird IV

Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .

Circuit Description

Intake Air Temperature (IAT) sensor is a thermistor that varies resistance based on temperature. As temperature of sensor increases, resistance decreases. High temperature will result in a low signal voltage. DTC will set when PCM sees an IAT sensor voltage of less than 0.82 volt for 10 seconds after engine runs for 100 seconds.

Conditions required to set DTC are

1. Vehicle driven at 25 MPH or greater.
2. No VSS, ECT or MAF sensor DTCs are set.
3. Engine running greater than 10 seconds.
4. IAT is greater than 282°F (139°C).
5. Conditions are present for at least 20 seconds.