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Civic (D15Z1)

  1. Turn ignition off. Connect test harness between ECM and main harness. See Figure . Wait at least 3 minutes. Turn ignition on. Measure voltage between terminals D8 and D22. See Figure . If voltage is greater than 0.5 volt, go to next step. If voltage is not greater than 0.5 volt, check White/Blue wire between sensor and ECM for shorts. If wiring is okay, go to next step.
  2. If voltage is greater than 5.0 volts, go to next step. If voltage is not greater than 5.0 volts, go to step 7).
  3. Measure voltage between terminals D16 and D22. If voltage is greater than 0.5 volt, go to next step. If voltage is not greater than 0.5 volt, check Blue/Green wire between sensor and ECM for shorts.
  4. If voltage between terminals D3 and D22 is 0.3-4.9 volts, go to next step. If voltage is not 0.3-4.9 volts, go to step 8).
  5. Start engine, and warm it until radiator fan comes on. Measure voltage between terminals D16 and D22. If voltage is 2.6-2.8 volts, go to next step. If voltage is not 2.6-2.8 volts, go to step 9).
  6. Measure voltage between terminals D14 and D22. If voltage is greater than 0.4 volt, replace ECM and retest system. If voltage is not greater than 0.4 volt, repair short in Orange/Blue wire between sensor and ECM.
  7. Unplug connector from sensor. Sensor is threaded into exhaust manifold. Measure voltage between terminals D8 and D22. If voltage is greater than 5 volts, replace sensor. If voltage is not greater than 5 volts, replace ECM and retest system.
  8. Turn ignition off. Unplug connector from sensor. Sensor is threaded into exhaust manifold. Turn ignition on. Measure voltage between White wire on harness connector and ground. If voltage is about 5 volts, replace sensor. If voltage is not about 5 ohms, repair open in White or Blue/Yellow wire between sensor and ECM.
  9. Measure voltage between terminals D8 and D22. If voltage is less than 2.8 volts, replace ECM and retest system. If voltage is not less than 2.8 volts, repair open in White/Blue or Green/White wire between sensor and ECM.
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