DTC Troubleshooting: P2199 (125)
DTC P2199:
 IAT Sensor 1/2 Incorrect Voltage Correlation
NOTE:
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. 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.
  1. Test-drive under these conditions:
    • Engine coolant temperature (ECT SENSOR 1) above 80 °C (176 °F)
    • Transmission in 3rd gear
    • Vehicle speed between 40 km/h (25 mph) and 60 km/h (38 mph)
  1. Monitor the OBD STATUS for DTC P2199 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES -
Go to Step 6 .
NO -
If the screen indicates PASSED, intermittent failure, the 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 Step 4 and recheck.
  1. Turn the ignition switch OFF.
  1. Allow the MAF sensor/IAT sensor 1 and the MAP sensor/IAT sensor 2 to cool below 25 °C (77 °F).
  1. Note the ambient temperature.
  1. 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.
  1. Turn the ignition switch ON (II).
  1. Note the value of IAT SENSOR 1 and IAT SENSOR 2 quickly in the DATA LIST with the HDS.
  1. Compare the value of IAT SENSOR 1 and the ambient temperature, and the value of IAT SENSOR 2 and the ambient temperature individually.
Does either sensor differ more than 35 °C (63 °F) from the ambient temperature?
YES -
Replace the sensor that differed more than 35 °C (63 °F) from the ambient temperature, then go to Step 14 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or blockage in the intake air duct, then go to Step 14 .
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. 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.
  1. Test-drive under these conditions:
    • Engine coolant temperature (ECT SENSOR 1) above 80 °C (176 °F)
    • Transmission in 3rd gear
    • Vehicle speed between 40 km/h (25 mph) and 60 km/h (38 mph)
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2199 indicated?
YES -
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 Step 1 .
NO -
Go to Step 20 .
  1. Monitor the OBD STATUS for DTC P2199 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 19 , go to the indicated DTC's troubleshooting.■
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 Step 1 . If the screen indicates NOT COMPLETED, go to Step 17 .