DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage. Generic Unit Repair 1999

For 1990-2009 cars only

Makes 🢒 Generic 🢒 1999 🢒 Unit Repair 🢒 DTC 🢒 DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage

Circuit Description

The intake air temperature (IAT) sensor is a thermistor that controls signal voltage to the PCM. When the air is cold, the sensor resistance is high, therefore the PCM will see a high signal voltage. As the air warms, sensor resistance becomes less and voltage drops.

Conditions for Running the DTC

•	The PCM performs this DTC diagnostic continuously.

•	The engine operation time is greater than 8 minutes.

Conditions for Setting the DTC

•	The intake air temperature is less than or equal to -40°C (-40°F).

•	All of the diagnostic set conditions met for 2 seconds.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.

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The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the Failure Records will store this information. If the diagnostic reports a failure on the second consecutive drive trip, the Freeze Frame records the operating conditions at the time of failure and updates the Failure Records.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL off after three consecutive trips without a fault condition.

•	A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diangostic does not report any failures.

•	The use of a scan tool

Diagnostic Aids

Important: Remove any debris from the PCM connector surfaces before servicing the PCM module. Inspect the PCM module connector gaskets when diagnosing/replacing the module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM module.

The scan tool displays intake air temperature in degrees centigrade. Check harness routing for a potential short to ground in the signal circuit. Refer to . A skewed sensor could result in poor driveability complaints.

An intermittent may be caused by the following:

•	Poor connections

•	Rubbed through wire insulation.

•	Broken wire inside the insulation.