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Home/Honda/Insight/Honda Insight ZE1 (1999-2006)/Repair manual/Testing & Diagnostics/DTC P0118: ECT Sensor Circuit High Voltage
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DTC P0118: ECT Sensor Circuit High Voltage Honda Insight ZE1

Testing & Diagnostics 5 illustrations ~420 words

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

Scheme 54

Scheme 54: DTC P0118: ECT Sensor Circuit High Voltage
Scheme 54: DTC P0118: ECT Sensor Circuit High Voltage

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Scheme 55

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Scheme 56

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Scheme 58
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is -4°F (-20°C) or less, or 5 V indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the ECT SENSOR in the DATA LIST with the HDS. Is -4°F (-20°C) or less, or 5 V indicated? YES - Go to step 8. NO - Replace the ECT sensor.
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between ECT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12. NO - Go to step 14 .
  12. Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  13. Check for continuity between ECM connector terminal C18 and body ground. Is there continuity? YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM; 2000-2001 M/T models (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES (2000-2001 M/T MODELS)»(ref-219288-S30600414382006021300000) ), 2002-2006 MAT models and CVT model (see «ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL»(ref-219288-S14477746672006021300000) ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see «ECM REPLACEMENT»(ref-219289-S04050852982006021300000) ). NO - Repair open in the wire between the ECM (C18) and the ECT sensor.
  14. Measure voltage between ECM connector terminal C26 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM (C26) and the ECT sensor. NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM; 2000-2001 M/T models (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES (2000-2001 M/T MODELS)»(ref-219288-S30600414382006021300000) ), 2002-2006 M/T models and CVT model (see «ECM UPDATING AND SUBSTITUTION FOR TESTING-2002-2006 M/T MODELS AND CVT MODEL»(ref-219288-S14477746672006021300000) ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see «ECM REPLACEMENT»(ref-219289-S04050852982006021300000) ).

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