P0113

Diagnostic Chart:

Schematic:

Temperature Vs Resistance:

The Intake Air Temperature (IAT) sensor is a thermistor located in the air intake passage of the air induction system on the engine. When the sensor is cold it has a high resistance; the resistance decreases as the temperature of the sensor increases. The PCM supplies a 5 volt signal to the sensor which is also connected to ground. The PCM reads the voltage drop on the sensor signal line to determine air temperature.

DTC PARAMETERS
DTC P0113 will set if the IAT reading is lower than -40°C (-40°F) for 3.125 seconds and when:
^ Engine run time is greater than 320 seconds.
^ Vehicle speed is less than 24 km/h (15 mph).
^ Engine coolant is greater than -40°C (-40°F)
^ DTCs P0117, P0118, P0125, P0502 and P0503 are not set.

IMPORTANT: The IAT signal is continuously checked when ignition is On.

DIAGNOSTIC AIDS
^ This DTC may be set if the vehicle has been in extremely cold ambients -35°F (-37°C). Ask the customer if this has occurred.

IAT temperature may be compared to ECT temperature with a Scan tool if engine has cooled overnight at ambient temperature. They should be relatively close to each other with ignition On and engine Off.

NOTE: A short to battery voltage will melt the IAT sensor.