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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 68 (PGM-FI SYSTEM)DTC TROUBLESHOOTINGDTC P1116: ECT SENSOR PERFORMANCE PROBLEM (2005-2006 MODELS)
2002 Honda Civic Si

DTC P1116: ECT Sensor Performance Problem (2005-2006 models)

2002 Honda Civic SiSECTION DTC P1116: ECT Sensor Performance Problem (2005-2006 models)
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  • If DTC P0111 is stored at the same time as DTC P1116, troubleshoot DTC P0111 first, then recheck for DTC P1116.
  1. Check for poor connections or loose terminals at the ECT sensor.

    Are the connections and terminals OK? 

    1. YES  - Go to step 2.
    2. NO  - Repair the connectors or terminals, then go to step  14.
  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  14.
    2. NO  - Go to step  5.
  4. Turn the ignition switch OFF.
  5. Drain the coolant (see COOLANT REPLACEMENT ).
  6. Remove the ECT sensor (see ECT SENSOR REPLACEMENT  ).
  7. Allow the ECT sensor to cool to 77°F (25°C).
  8. Note the outside temperature.
  9. Connect the ECT sensor to the 2P connector, but do not install them in the engine.
  10. Turn the ignition switch ON (II).
  11. Note the value of the ECT SENSOR quickly in the DATA LIST with the HDS.
  12. Compare the value of the ECT SENSOR and the outside temperature.

    Does the value of the ECT SENSOR differ 5.4°F (3°C) or higher? 

    1. YES  - Replace the ECT sensor (see ECT SENSOR REPLACEMENT  ), then go to step 13.
    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the PCM.
  13. Turn the ignition switch ON (II).
  14. Reset the PCM with the HDS.
  15. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  16. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES  - If DTC P0116 is indicated, check for poor connections or loose terminals at the ECT sensor and the 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.