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

General Description

Two engine coolant temperature (ECT) sensors and three 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 at ECT sensor 1, ECT sensor 2, and IAT sensor 2 will equalize to ambient temperature. In addition, since right IAT sensor 1, left IAT sensor 1, IAT sensor 2 are located on the same intake airflow route, shows a close temperature value after the engine is started. Utilizing these characteristics, ECT sensor 1 and IAT sensor 2 are compared to ECT sensor 2 when the system is activated after the vehicle has been left for certain duration. If it is determined as normal, right IAT sensor 1 and left IAT sensor 1 are compared to IAT sensor 2 when the engine is started. If their correlations are abnormal, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
1 second or more*, 10 seconds or less**
DTC Type
Two drive cycles, MIL on
*: After the system is activated
**: After the engine is started

Enable Conditions
Condition
Minimum
Maximum
Engine off time
6 hours
–

Malfunction Threshold
A malfunction is detected if the following conditions are present when the system is activated after the vehicle has been left for at least 6 hours:

Temperature difference between each sensor values
Malfunction judgment
ECT 1* - ECT 2**
IAT 2*** - ECT 2**
ECT sensor 1
IAT sensor 2
ECT sensor 2
Higher than 57 °F (32 °C)
Higher than 57 °F (32 °C)
Normal
Normal
Failure
From -43 °F (-24 °C) to
57 °F (32 °C)
Failure
Normal
Normal
Lower than -43 °F
(-24 °C)
Failure
Failure
Normal
From -43 °F (-24 °C) to 57 °F (32 °C)
Higher than 57 °F (32 °C)
Normal
Failure
Normal
From -43 °F (-24 °C) to
57 °F (32 °C)
Normal
Normal
Normal
Lower than -43 °F
(-24 °C)
Normal
Failure
Normal
Lower than -43 °F
(-24 °C)
Higher than 57 °F (32 °C)
Failure
Failure
Normal
From -43 °F (-24 °C) to
57 °F (32 °C)
Failure
Normal
Normal
Lower than -43 °F
(-24 °C)
Normal
Normal
Failure

A malfunction is detected if the following conditions are present after IAT sensor 2 is determined as normal and 10 seconds after the engine is started:

Temperature difference between each sensor values
Malfunction judgment
R IAT 1**** - IAT 2***
Right IAT sensor 1
Higher than 57 °F (32 °C)
Failure
From -43 °F (-24 °C) to
57 °F (32 °C)
Normal
Lower than -43 °F
(-24 °C)
Failure

Temperature difference between each sensor values
Malfunction judgment
L IAT 1***** - IAT 2***
Left IAT sensor 1
Higher than 57 °F (32 °C)
Failure
From -43 °F (-24 °C) to
57 °F (32 °C)
Normal
Lower than -43 °F
(-24 °C)
Failure
*: [ECT SENSOR 1]
**: [ECT SENSOR 2]
***: [IAT SENSOR 2]
****: [IAT Sensor (1)]
*****: [IAT Sensor Bank2]
[ ]: HDS Parameter

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.
ECT sensor 1 failure
ECT sensor 2 failure
Right IAT sensor 1 failure
Left IAT sensor 1 failure
IAT sensor 2 failure
Engine block heater attachment (non-genuine part)

Confirmation Procedure
Operating Condition
1.
Turn the vehicle to the OFF (LOCK) mode, and wait at least 6 hours.
2.
Enter the maintenance mode, then 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 or the on-board snapshot is stored, test the vehicle under an ambient temperature close to the intake air temperature in the freeze data or the on-board snapshot.
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, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.