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DTC P0118: ECT Sensor 1 Circuit High Voltage Honda Crosstour I

Testing & Diagnostics 4 illustrations ~578 words

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

Scheme 347

Scheme 347: DTC P0118: ECT Sensor 1 Circuit High Voltage
Scheme 347: DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 348

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Scheme 350
  1. Turn the ignition switch to ON (II).
  2. Check ECT SENSOR 1 in the DATA LIST with the HAS. Is about -40 °F (-40 °C) or less, or 4.92 V or more indicated? YES -Go to next step. NO -Intermittent failure, the 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 to LOCK (0).
  4. Disconnect the 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 to ON (II).
  7. Check ECT SENSOR 1 in the DATA LIST with the HAS. Is about -40 °F (-40 °C) or less, or 4.92 V or more indicated? YES -Go to next step. NO -Go to step 20 .
  8. Turn the ignition switch to LOCK (0).
  9. Remove the jumper wire from the ECT sensor 1 2P connector.
  10. Turn the ignition switch to ON (II).
  11. Measure the voltage between ECT sensor 1 2P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to next step. NO -Go to step 16 .
  12. Turn the ignition switch to LOCK (0).
  13. Jump the SCS line with the HAS.
  14. Disconnect PCM connector C (49P).
  15. Check for continuity between PCM connector terminal C16 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C16) and ECT sensor 1, then go to step 22 .
  16. Turn the ignition switch to LOCK (0).
  17. Jump the SCS line with the HAS.
  18. Disconnect PCM connector C (49P).
  19. Check for continuity between PCM connector terminal C32 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C32) and ECT sensor 1, then go to step 22 .
  20. Turn the ignition switch to LOCK (0).
  21. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(ref-360080-S08997137262010042600000) (+).
  22. Reconnect all connectors.
  23. Turn the ignition switch to ON (II).
  24. Reset the PCM with the HAS.
  25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-360079-S22847966492010042600000) (+).
  26. Check for Pending or Confirmed DTCs with the HAS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
  27. Reconnect all connectors.
  28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-360080-S11980508702010042600000) (+) or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-360056-S32194616542010042600000) (+).
  29. Check for Pending or Confirmed DTCs with the HAS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-360056-S32194616542010042600000) (+) then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(ref-360080-S27881728262010042600000) (+). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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