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Test NF-7B - Checking Oxygen (O2) Sensor Switching

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Allow engine to idle. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary. Perform VERIFICATION PROCEDURE VER-2. If no vacuum leaks exist, using DRB-II, read O2 sensor signal voltage.
  2. If voltage is more than 0.1 volt, go to step 4). If voltage is less than 0.1 volt, turn ignition off. Disconnect O2 sensor connector. Disconnect Powertrain Control Module (PCM) connector. Put DRB-II in ohmmeter mode. Using DRB-II, check resistance of O2 sensor connector (harness side), signal circuit (Black/Dark Green wire).
  3. If resistance is less than 10 ohms, repair short to ground in Black/Dark Green wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is more than 10 ohms, replace O2 sensor. Perform VERIFICATION PROCEDURE VER-2.
  4. Turn engine off. Replace O2 sensor. Turn ignition on. Using DRB-II, reset adaptive fuel memory. Start engine. Allow engine to reach normal operating temperature.
  5. Using DRB-II, read O2 sensor state. If O2 sensor state is switching, repair is complete. Perform VERIFICATION PROCEDURE VER-2. If O2 sensor state is not switching, go to TEST NF-15A.
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