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

General Description

Two engine coolant temperature (ECT) sensors and two intake air temperature (IAT) sensors are used by the powertrain control module (PCM). When the engine is stopped and enough time has passed, the temperatures of each sensor will equalize to the ambient temperature. The IAT sensor 2 failure is detected by comparing the sensor value difference of IAT sensor 1 and IAT sensor 2 after ECT sensor 1, ECT sensor 2, and IAT sensor 1 correlations are judged as normal. If the temperature difference between IAT sensor 1 and IAT sensor 2 exceeds a normal range, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
P011A, P011B, P2183 are judged as OK
Duration
10 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Engine off time
6 hours
–

Malfunction Threshold
The temperature difference between IAT sensor 1 and IAT sensor 2 is 44 °F (24 °C) or more.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
IAT sensor 2 failure
Engine off timer failure
Engine block heater attachment (non-genuine part)

Confirmation Procedure
Operating Condition
1.
Turn the vehicle to the OFF (LOCK) mode and leave the vehicle for 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.
With the HDS
None.

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 12 volt battery.