Advanced Diagnostics

Advanced Diagnostics - DTC P0111: Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem






General Description
Two engine coolant temperature (ECT) sensors and one intake air temperature (IAT) sensor are used by the powertrain control module (PCM). When the engine is stopped and enough time has passed, the temperature of the engine will equalize to the ambient temperature. ECT sensor 1 and IAT sensor are compared to ECT sensor 2, and if an inappropriate temperature is read, the PCM detects a malfunction in the corresponding sensor and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
A malfunction is detected if the following conditions are present after the engine has stopped and the ignition switch has been turned to LOCK (0) for at least 6 hours before restarting the engine:






Driving Pattern
1. Turn the ignition switch to LOCK (0), and wait at least 6 hours.
2. Start the engine, and let it idle for at least 10 seconds.

- Do not use an engine block heater because the engine coolant temperature will not stay equal during engine stop.
- When freeze data is stored, test the vehicle under an ambient temperature close to the intake air temperature in the freeze data.
- When an ambient temperature extremely changes, malfunction judgment may not execute. Avoid extreme temperature changing condition after or before engine start. (When the vehicle is parked in the garage, open the shutter to introduce outside air; then start the engine.)

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.