P0113

Diagnostic Chart:

Schematic:

The intake air temperature sensor is an integral part of the mass air flow (MAF) sensor. The intake air temperature (IAT) sensor is a thermistor that varies resistance according to changes in air induction temperature. The ECM supplies a five volt reference through a pull-up resistor to the sensor, which is connected to ground. When the sensor is cold it has high resistance (high signal voltage at ECM). As the sensor temperature increases, its resistance decreases (lower signal voltage at ECM). The ECM uses the signal voltage to determine air induction temperature. DTC P0113 sets when the IAT sensor signal voltage at the ECM is above the calibrated voltage value (below the calibrated temperature value).

DTC PARAMETERS
DTC P0113 will set if IAT temperature is below -39°C (-38°F) when:
^ Condition exists for longer than 2 seconds
^ Engine run time is greater than 3 minutes
^ Engine has been at idle for at least 10 seconds

DTC P0113 diagnostic runs continuously once the above conditions have been met.

P0113 is a type B DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to monitor IAT sensor temperature with ignition On, engine Off. Wiggling wires while watching for a change in IAT sensor temperature may locate the area where an open or short to voltage in the wiring may exist.

The CMP/ECT/IAT/MAF sensors share the same sensor return circuit 2761.

Refer to ECT General Description for a Temperature vs. Resistance chart.

IMPORTANT: A direct short to voltage on circuit 2761 may cause internal damage to the ECM ground trace, or open the sensor element in the ECT and/or IAT sensors.