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All Models

  1. Be sure sensor was changed at proper interval (30, 000 miles). If not, replace sensor. If sensor is not due for change, test as follows.
  2. Run engine at 1200 RPM and connect a voltmeter to the Dark Green wire to carburetor (or regulator) from computer. Hold choke blade closed. During the next 10 seconds, voltage should decrease to 3 volts or less and maintain at that level.
  3. On 4 cylinder models, if engine does not respond, disconnect the 4-way "T" from temperature sensor on air cleaner and allow engine to draw air. Repeat test.
  4. Disconnect PCV system and/or canister purge hose. During the next 10 seconds, voltage should be greater than 9 volts. Voltage should then decrease slightly and maintain that level until hoses are reconnected.
  5. If oxygen sensor fails test, replace it. Ensure that threads are coated with anti-seize compound and sensor is tightened to 35 ft. lbs. with special tool C-4589.
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