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Test NF-6A - Checking Oxygen (O2) Sensor Switching

  1. Allow engine to reach normal operating temperature. Using DRB-II, read O2 sensor state. If O2 sensor state is switching, system is functioning okay. If O2 sensor state is not switching, check if O2 sensor is locked on lean. If O2 sensor is locked on lean, perform TEST NF-6B. If O2 sensor is not locked on lean, turn engine off.
  2. Let engine cool 5 minutes. Remove and inspect spark plugs for wet tips and fuel fouling. If either condition exists, replace leaking injectors at corresponding cylinders. Perform VERIFICATION PROCEDURE VER-3.
  3. If neither condition exists, inspect air cleaner and air inlet ducts for restrictions. Clean restricted air inlet as necessary. Perform VERIFICATION PROCEDURE VER-3. If air inlet is not restricted, perform TEST NF-12A.
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