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Home >> Mazda >> 1997 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Heated Oxygen Sensor (Ho2S) >> Using Engine Signal Monitor

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 terminal 3C for front sensor or terminal 3D for rear 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. 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 sensor terminals "D" and "C". See Figure . Resistance should be about 13 ohms with sensor temperature at 68°F (20°C). If resistance is not as specified, replace HO2S.
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