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Home >> Mazda >> 1994 >> Protege Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - System/Component Tests) >> Engine Sensors & Switches >> Oxygen (O2S) Sensor
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Oxygen (O2S) Sensor

WARNING: This page is about a different car, the 1994 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Warm engine to operating temperature. Operate engine at idle. Disconnect O2S sensor electrical connector. Connect voltmeter between connector and ground. Increase engine speed to 3000 RPM until voltmeter indicates about .55 volt.
  2. Observe voltmeter while rapidly accelerating and decelerating engine speed. Voltage should be 0.5-1.0 volt during acceleration and 0.0-0.4 volt during deceleration. Replace O2S sensor as necessary.
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