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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 68 (PGM-FI SYSTEM)DTC TROUBLESHOOTINGDTC P0116: ECT SENSOR RANGE/PERFORMANCE PROBLEM (2005-2006 MODELS)
2002 Honda Civic Si

DTC P0116: ECT Sensor Range/Performance Problem (2005-2006 models)

2002 Honda Civic SiSECTION DTC P0116: ECT Sensor Range/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 ).
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS.

    Is about 176°F (80°C) or higher, or 0.78 V or less indicated? 

    1. YES  - Go to step  6.
    2. NO  - Go to step 3.
  3. Note the value of the ECT SENSOR in the DATA LIST with the HDS.
  4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  5. Check the ECT SENSOR in the DATA LIST with the HDS.

    Does the ECT SENSOR change 18°F (10°C) or more? 

    1. YES  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the PCM.
    2. NO  - Go to step  11.
  6. Note the value of ECT SENSOR in the DATA LIST with the HDS.
  7. Turn the ignition switch OFF.
  8. Open the hood, and let the engine cool for 3 hours.
  9. Turn the ignition switch ON (II).
  10. Check the ECT SENSOR in the DATA LIST with the HDS.

    Does ECT SENSOR change 18°F (10°C) or more? 

    1. YES  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the PCM.
    2. NO  - Go to step 11.
  11. Turn the ignition switch OFF.
  12. Replace the ECT sensor (see ECT SENSOR REPLACEMENT  ).
  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.