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Home >> Mazda >> 1997 >> MPV ES, 3.0 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Heated Oxygen Sensor (Ho2S) >> Using Engine Signal Monitor
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Using Engine Signal Monitor

  1. Warm engine to normal operating temperature. Connect Engine Signal Monitor (49 9200 162A) to ECM, using proper overlay and adapter cables. Measure voltage at ECM terminals 2K for rear sensor or 3C for front sensor. See HO2S VOLTAGE  table.
  2. If voltage is not as specified, check wiring harness and connector between ECM and HO2S. Also check intake manifold system, fuel system and self-diagnostic system. Repair as necessary. If no problems are found, replace HO2S.
  3. To test HO2S heating element, allow sensor to cool to room temperature. Disconnect HO2S connector. Using ohmmeter, measure resistance between terminals "C" and "D". See Figure . Resistance should be about 13 ohms at 68°F (20° C). If resistance is not as specified, replace HO2S.
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