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 34 °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 illuminating the MIL
When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and the freeze frame data are stored.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs. The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.