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DTC P2185: ECT Sensor 2 Circuit High Voltage Honda Fit I

Testing & Diagnostics 5 illustrations ~571 words

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

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Scheme 219: DTC P2185: ECT Sensor 2 Circuit High Voltage
Scheme 219: DTC P2185: ECT Sensor 2 Circuit High Voltage

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  1. Turn the ignition switch ON (II).
  2. Check ECT SENSOR 2 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, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2 2P connector.
  5. Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check ECT SENSOR 2 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 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire from the ECT sensor 2 2P connector.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between ECT sensor 2 2P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 17 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector E (31P).
  15. Connect ECT sensor 2 2P connector terminal No. 1 to body ground with a jumper wire.
  16. Check for continuity between ECM/PCM connector terminal E4 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (E4) and ECT sensor 2, then go to step 20 .
  17. Measure voltage between ECM/PCM connector terminal E1 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (E1) and ECT sensor 2, then go to step 20 . NO - Go to step 25 .
  18. Turn the ignition switch OFF.
  19. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(ref-291411-S41747978832008072800000) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-291413-S23447131872008072800000) ).
  24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
  25. Turn the ignition switch OFF.
  26. Reconnect all connectors.
  27. Update the ECM/PCM if it does not have the latest software (see «UPDATING THE ECM/PCM»(ref-291410-S41633658632008072800000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-291410-S09944723422008072800000) ).
  28. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-291410-S09944723422008072800000) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete, if the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-291411-S17209936142008072800000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

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