Advanced Diagnostics

Advanced Diagnostics - DTC P2199: Intake Air Temperature (IAT) Sensor 1, 2 Incorrect Correlation










General Description
This turbocharged engine is equipped with two engine coolant temperature (ECT) sensors and two intake air temperature (IAT) sensors to monitor temperature. When the engine stops and enough time passes, the temperature of each part of the vehicle becomes the same as the outside temperature. When inappropriate temperature is detected by the temperature comparison between sensors at that time, a malfunction of the corresponding sensor is detected. Mutual comparison of ECT sensor 1, ECT sensor 2, and IAT sensor 2 mainly used for engine control is implemented and when IAT sensor 2 is determined as normal, IAT sensor 2 and IAT sensor 1 are compared to determine the accuracy of IAT sensor 1.

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






Enable Conditions






Malfunction Threshold
A malfunction is detected if this condition is present after the engine and the ignition switch have been off for at least 6 hours before restarting the engine.
- When the temperature difference between the IAT2 and IAT1 is 35 °F (19 °C) or more.

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.

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.