P1112

Diagnostic Chart:

Wiring Diagram:

Temperature - Resistance Chart For Sensors:

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 and P1112 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 while P1112 will set in about two seconds.

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

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem, use the Scan tool to review malfunction history diagnostic information. This supplemental data can be used to duplicate a problem.

Check the tightness of the female terminal grip with a spare male terminal.

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.