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Home >> Acura >> 2004 >> TL Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0111, P1116: IAT Sensor Circuit Range/Performance Problem (2006 Model); ECT Sensor Circuit Range/Performance Problem (2006 Model)
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DTC P0111, P1116: IAT Sensor Circuit Range/Performance Problem (2006 Model); ECT Sensor Circuit Range/Performance Problem (2006 Model)

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

    Are the connections and terminals OK? 

    1. YES  - Go to step  2.
    2. NO  - Repair the connectors or terminals, then go to step  25.
  2. Start the engine, and let it idle for 10 minutes.
  3. Check the ECT SENSOR in the DATA LIST with the HDS.

    Is about 129°F (54°C) or less, or 1.54 V or more indicated? 

    1. YES  - Replace the ECT sensor (see ECT SENSOR REPLACEMENT  ), then go to step  25.
    2. NO  - Go to step  4.
  4. Turn the ignition switch OFF.
  5. Remove the IAT sensor (see IAT SENSOR REPLACEMENT  ).
  6. Allow the IAT sensor to cool ambient temperature.
  7. Note the ambient temperature.
  8. Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
  9. Turn the ignition switch ON (II).
  10. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
  11. Compare the IAT SENSOR and the ambient temperature.

    Does the IAT SENSOR differ 5.4°F (3°C) or more? 

    1. YES  - Replace the IAT sensor (see IAT SENSOR REPLACEMENT  ), then go to step  25.
    2. NO  - Go to step  12.
  12. Disconnect the IAT sensor from the 2P connector.
  13. Using a heat gun, blow hot air on the IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
  14. Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
  15. Check the IAT SENSOR in the DATA LIST with the HDS.

    Does the IAT SENSOR change 82°F (28°C) or more? 

    1. YES  - Go to step  16.
    2. NO  - Replace the IAT sensor (see IAT SENSOR REPLACEMENT  ), then go to step  25.
  16. Turn the ignition switch OFF.
  17. Drain the coolant (see COOLANT CHECK ).
  18. Remove the ECT sensor (see ECT SENSOR REPLACEMENT  ).
  19. Allow the ECT sensor to cool to ambient temperature.
  20. Note the ambient temperature.
  21. Connect the ECT sensor to its 2P connector, but do not install it on the engine.
  22. Turn the ignition switch ON (II).
  23. Note the value of the value of ECT SENSOR quickly in the DATA LIST with the HDS.
  24. Compare the value of the ECT SENSOR and the ambient temperature.

    Does the ECT SENSOR differ 5.4°F (3°C) or more? 

    1. YES  - Replace the ECT sensor (see ECT SENSOR REPLACEMENT  ), then go to step  25.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
  25. Turn the ignition switch ON (II).
  26. Reset the ECM/PCM with the HDS.
  27. Do the ECM/PCM IDLE LEARN PROCEDURE .
  28. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P0111 and/or P1116 is indicated, check for poor connections or loose terminals at the ECT sensor, or the IAT sensor and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO  - Troubleshooting is complete.
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