DTC Troubleshooting: P2199 (125-4)

DTC P2199:  IAT Sensor 1/2 Incorrect Voltage Correlation

NOTE: Before starting this troubleshooting, check for poor connections or blockage at the intake air duct.

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Start the engine. Hold the engine speed at 2,000 rpm (min-1) without load (in neutral) until the radiator fan comes on, then let it idle.

4.Test-drive under these conditions:
  • Engine coolant temperature above 80 °C (176 °F)
  • Transmission in 3rd gear
  • Vehicle speed between 40 km/h (25 mph) and 60 km/h (38 mph)

5.Monitor the OBD STATUS for DTC P2199 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?


YES - Go to 6.


NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2 and the ECM, and check for poor connections or blockage in the intake air duct. If the screen indicates NOT COMPLETED, go to 4 and recheck.


6.Turn the ignition switch OFF.

7.Remove the MAF sensor/IAT sensor 1, and the MAP sensor/IAT sensor 2.

8.Allow the MAF sensor/IAT sensor 1 and the MAP sensor/IAT sensor 2 to cool below 25 °C (77 °F).

9.Note the outside temperature.

10.Connect the MAF sensor/IAT sensor 1 to its 2P connector and the MAP sensor/IAT sensor 2 to its 2P connector, but do not install them into the intake air duct.

11.Turn the ignition switch ON (II).

12.Note the value of IAT SENSOR 1 and IAT SENSOR 2 quickly in the DATA LIST with the HDS.

13.Compare the value of IAT SENSOR 1 and the outside temperature, and the value of IAT SENSOR 2 and the outside temperature individually.

Does either sensor differ more than 35 °C (63 °F) from the outside temperature?


YES - Replace the sensor that differed more than 35 °C (63 °F) from the outside temperature, then go to 14.


NO - Intermittent failure, system is OK at this time. Check for poor connections or blockage in the intake air duct, then go to 14.


14.Install the MAF sensor/IAT sensor 1, and the MAP sensor/IAT sensor 2.

15.Turn the ignition switch ON (II).

16.Reset the ECM with the HDS.

17.Start the engine. Hold the engine speed at 2,000 rpm (min-1) without load (in neutral) until the radiator fan comes on, then let it idle.

18.Test-drive under these conditions:
  • Engine coolant temperature above 80 °C (176 °F)
  • Transmission in 3rd gear
  • Vehicle speed between 40 km/h (25 mph) and 60 km/h (38 mph).

19.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2199 is indicated, check for poor connections or loose terminals at the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2 and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Go to 20.


20.Monitor the OBD STATUS for DTC P2199 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?


YES - Troubleshooting is complete.n


NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAF sensor/IAT sensor 1, the MAP sensor/IAT sensor 2 and the ECM, then go to 1. If the screen indicates NOT COMPLETED, go to 18 and recheck.