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Oxygen Sensor

  1. Warm engine to normal operating temperature. Disconnect oxygen sensor connector.
  2. Connect digital voltmeter between oxygen sensor side terminal (of disconnected connector) and ground. See Fig 1 . DO NOT  apply voltage to oxygen sensor.
    Fig 1: Connecting Voltmeter to Oxygen Sensor
    G42236
  3. With engine at 1500-2000 RPM, turn WOT micro switch "ON" by moving micro switch lever. See Fig 2 . Check that voltmeter reads about .8 volts.
    Fig 2: Moving WOT Micro Switch Lever
    G42237
  4. With engine at 1000-1500 RPM, disconnect Hot Idle Compensator vacuum hose at intake manifold. Check that voltmeter reads near zero. Reconnect vacuum hose and oxygen sensor connector.
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