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Oxygen Sensor

  1. Warm up engine to normal operating temperature. Connect a voltmeter to service connector by attaching positive probe to "Ox" terminal and negative probe to "E" terminal. See Figure.
    NOTE: Service connector is located on left fender panel near ignition coil on Celica, Corona and Tercel models or on left dash panel on Corolla and Pickup models.
  2. Run engine at 2500 RPM for about 90 seconds. Maintain engine speed and check that voltmeter needle fluctuates 8 or more times in 10 seconds within 0-7 volts. If not, replace oxygen sensor.
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