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DTC P0116: ECT Sensor Circuit Range/Performance Problem (2003-2004 models) Honda Accord VII

Testing & Diagnostics ~402 words

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 more, or 0.86 V or less indicated? YES - Go to step 3. NO - Go to step 7 .
  3. Note the coolant temperature from step 2 .
  4. Turn the ignition switch OFF.
  5. Let the engine cool for 1 hour.
  6. Check the ECT SENSOR in the DATA LIST with the HDS. Did the ECT change 3.6°F (2°C) or more? YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system. NO - Go to step 10 .
  7. Note the coolant temperature.
  8. 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.
  9. Check the ECT SENSOR in the DATA LIST with the HDS. Does the ECT change 3.6°F (2°C) or more? YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system. NO - Go to step 10.
  10. Turn the ignition switch OFF.
  11. Replace the ECT sensor (see «ECT SENSOR/ECT SENSOR 1 REPLACEMENT»(ref-217090-S38016301862006012800000) ).
  12. Turn the ignition switch ON (II).
  13. Reset the ECM/PCM with the HDS.
  14. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-217093-S19810389522006012800000) ).
  15. Allow the engine to cool to ambient temperature.
  16. Start the engine, and let it idle 20 minutes.
  17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0116 indicated? YES - Check for poor connections or loose terminals at the ECT 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. NO - Go to step 18.
  18. Monitor the OBD STATUS for DTC P0116 in the DTCs MENU with the HDS. Does the screen indicates PASSED? YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 17, go to the indicated DTC's troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 15 .

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