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Oxygen Sensor (O2S): D15B8

  1. Turn ignition off. Connect test harness between ECM and vehicle wiring harness. See Figure . Wait at least 2 minutes. Connect jumper wire between test harness terminals A6 and A26. Connect DVOM between terminals A26 and D14. Turn ignition on. Immediately observe DVOM. Voltage should be 0.4-0.5 volt and then decrease to 0.1 volt or less within 2 minutes. If voltage is not as specified, go to next step. If voltage is as specified, go to step 3).
  2. Unplug connector from O2S, threaded into exhaust manifold. Measure voltage at harness connector White and Green/White wires. If voltage is greater than 0.1 volt, replace O2S. If voltage is not greater than 0.1 volt, repair open in White or Green/White wire between ECM and O2S.
  3. Unplug connector from O2S, threaded into exhaust manifold. Measure voltage at harness connector White and Green/White wires. If voltage is not greater than 0.1 volt, go to next step. If voltage is greater than 0.1 volt, replace O2S.
  4. Unplug connector "D" from main wiring harness. Measure voltage between terminals A26 and D14. If voltage is greater than 0.1 volt, repair short to voltage in White wire between ECM and O2S. If voltage is not greater than 0.1 volt, replace ECM and retest system.
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