P1111

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 P0113 or P1111 will set if the IAT reading is lower than -30°C (-22°F) when:
^ Engine run time is greater than 10 seconds.
^ Vehicle speed less than 24 km/h (15 mph).
^ No VSS DTC has been set.
^ Airflow less than 16 gm/sec.

P01113 will set if conditions are met for about six seconds while P1111 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. The supplemental data can be used to duplicate a problem.

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

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

NOTE: A short to B+ on circuit 472 will cause damage to the IAT sensor. If 472 is found to be shorted, test sensor for proper resistive value.

NOTE: If fused jumper (in test chart step) blows fuse, locate and repair short to B+ in circuit.