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Home >> Mazda >> 1989 >> B2200 Base, 2D Pickup, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> System/Component Tests - CARBURETED >> Engine Sensors & Switches >> System/Component Tests - CARBURETED >> O2 Sensor

O2 Sensor

  1. Warm engine to operating temperature and allow to idle. Connect digital voltmeter between O2 sensor connector and ground. See Figure .
  2. Run engine at 4000 RPM until voltmeter reads .7 volts. Repeatedly increase and decrease engine RPM suddenly. When engine RPM is increased, voltmeter should read .5-1.0 volt. When engine RPM is decreased, voltmeter should read 0-.4 volt. Replace defective O2 sensor.
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