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Oxygen Sensor

  1. For vehicle with HAC system, disconnect vacuum hose between HAC valve and check valve at check valve side, and plug the check valve.
  2. On all models, warm up engine to normal operating temperature. Connect voltmeter to service connector, located at right fender apron behind battery. Connect the positive (+) testing probe to terminal Ox and minus (-) testing probe to terminal E.
  3. Race engine at 2500 RPM for about 90 seconds. Maintain the engine speed and check that the needle of the voltmeter fluctuates 8 times or more in 10 seconds with 0-7 volts.
  4. Reconnect vacuum hose to proper location on HAC system. If test is positive, oxygen sensor is O.K. If not, inspect the other parts, hose connections, and wiring of air injection system. If no problem is found, replace oxygen sensor.
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