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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 136 (PGM-FI SYSTEM)DTC TROUBLESHOOTINGDTC P0116: ECT SENSOR 1 CIRCUIT RANGE/PERFORMANCE PROBLEM
2002 Honda Civic Si

DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem

2002 Honda Civic SiSECTION DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch ON (II).
  2. Check ECT SENSOR 1 in the DATA LIST with the HDS.

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

    1. YES  - Go to step  6.
    2. NO  - Go to step  3.
  3. Note the value of ECT SENSOR 1 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 ECT SENSOR 1 in the DATA LIST with the HDS.

    Did ECT SENSOR 1 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 ECT sensor 1 and the PCM.
    2. NO  - Go to step  11.
  6. Note the value of ECT SENSOR 1 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 ECT SENSOR 1 in the DATA LIST with the HDS.

    Did ECT SENSOR 1 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 ECT sensor 1 and the PCM.
    2. NO  - Go to step  11.
  11. Turn the ignition switch OFF.
  12. Replace ECT sensor 1 (see ECT SENSOR 1 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 ECT sensor 1 and the PCM, then go to step  1. If any other Temporary DTSs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO  - Troubleshooting is complete.
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