P0112

Diagnostic Chart:

Wiring Diagram:

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 five 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 P0112 will set if the IAT reading is over 125°C (257°F) when:
^ Engine run time is greater than 10 seconds.
^ VSS is present.
^ Air flow is less than 16 gm/second.
^ No VSS or ECT DTCs have been set.
P0112 will set if conditions are met for about six seconds.

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

DIAGNOSTIC AIDS
Refer to Description and Operation in this manual for Temperature vs. Resistance chart.

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