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Home >> Acura >> 2009 >> TSX Standard >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System (4-CYL) >> DTC Troubleshooting >> DTC P0111: IAT Sensor Circuit Range/Performance Problem

DTC P0111: IAT Sensor Circuit Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )
  1. Check for poor connections or loose terminals at ECT sensors 1 and 2, and the IAT sensor

    Are the connections and terminals OK? 

    YES  -Go to step 2

    NO  -Repair the connectors or terminals, then go to step  15

  2. Remove the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT )
  3. Allow IAT sensor to cool to ambient temperature
  4. Note the ambient temperature
  5. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install the sensor onto the air cleaner
  6. Turn the ignition switch to ON (II)
  7. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS
  8. Compare the value of the IAT SENSOR and the ambient temperature

    Does the value of the IAT SENSOR differ 5 4°F (3 °C) or more? 

    YES  -Go to step  13

    NO  -Go to step 9

  9. Disconnect the MAF sensor/IAT sensor from its 5P connector
  10. Using a heat gun, blow hot air on the MAF sensor/IAT sensor for a few seconds Do not apply the heat longer than a few seconds or you will damage the sensor
  11. Connect the MAF sensor/IAT sensor to the 5P connector, but do not install the sensor onto the air cleaner
  12. Check the IAT SENSOR in the DATA LIST with the HDS

    Does the IAT SENSOR change 63 °F (35 °C) or more? 

    YES  -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM

    NO  -Go to step  13

  13. Turn the ignition switch to LOCK (0)
  14. Replace the MAF sensor/IAT sensor (see MAF SENSOR/IAT SENSOR REPLACEMENT )
  15. Turn the ignition switch to ON (II)
  16. Reset the ECM/PCM with the HDS
  17. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE )
  18. Check for Temporary DTCs or DTCs with the HDS

    Is DTC P0111 indicated? 

    YES  -Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM, then go to step  1

    NO  -Troubleshooting is complete If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting

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