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DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem Honda Odyssey III

Testing & Diagnostics 5 illustrations ~1246 words
  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? YES - Go to step 6 . 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? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. 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? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO - Go to step 11 .
  11. Turn the ignition switch OFF.
  12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-220946-S15107920842006022100000) ).
  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»(ref-220951-S17680691112006022100000) ).
  16. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? 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. NO - Troubleshooting is complete.

Scheme 31

Scheme 31: DTC P0117: ECT Sensor 1 Circuit Low Voltage
Scheme 31: DTC P0117: ECT Sensor 1 Circuit Low Voltage
  1. Turn the ignition switch ON (II).
  2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect ECT sensor 1 2P connector.
  5. Turn the ignition switch ON (II).
  6. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7 . NO - Go to step 11 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect PCM connector C (44P).
  10. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between ECT sensor 1 and the PCM (C27), then go to step 13 . NO - Go to step 18 .
  11. Turn the ignition switch OFF.
  12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-220946-S15107920842006022100000) ).
  13. Reconnect all connectors.
  14. Turn the ignition switch ON (II).
  15. Reset the PCM with the HDS.
  16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-220951-S17680691112006022100000) ).
  17. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 19 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  18. Update the PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-220945-S16531944742006022100000) ).
  19. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 19 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(ref-220946-S32339521312006022100000) ).

Scheme 32

Scheme 32: DTC P0118: ECT Sensor 1 Circuit High Voltage
Scheme 32: DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

Scheme 35

Scheme 35
Scheme 35
  1. Turn the ignition switch ON (II).
  2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES - Go to step 3 . NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect ECT sensor 1 2P connector.
  5. Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES - Go to step 8 . NO - Go to step 20 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 16 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect PCM connector C (44P).
  15. Check for continuity between PCM connector terminal C14 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C14) and ECT sensor 1, then go to step 22 .
  16. Turn the ignition switch OFF.
  17. Jump the SCS line with the HDS.
  18. Disconnect PCM connector C (44P).
  19. Check for continuity between PCM connector terminal C27 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C27) and ECT sensor 1, then go to step 22 .
  20. Turn the ignition switch OFF.
  21. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-220946-S15107920842006022100000) ).
  22. Reconnect all connectors.
  23. Turn the ignition switch ON (II).
  24. Reset the PCM with the HDS.
  25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-220951-S17680691112006022100000) ).
  26. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 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 DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
  27. Update the PCM if it does not have the latest software, or substitute a known-good PCM (see «PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-220945-S16531944742006022100000) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 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 DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(ref-220946-S32339521312006022100000) ).

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