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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 TEST VER-2. If no vacuum leaks exist, read both O2 sensor signal voltages using DRB-II.
  2. If voltage for either or both O2 sensors is more than 0.1 volt, go tostep 4). If voltage is less than 0.1 volt for both O2 sensors, turn ignition off. Disconnect faulty O2 sensor connector (left or right). Disconnect Powertrain Control Module (PCM) connector. Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of left O2 sensor connector signal wire (Black/Dark Green wire) and right O2 sensor connector signal wire (Tan/White wire).
  3. If resistance at either or both is less than 10 ohms, repair right or left O2 sensor signal wire for short to ground. Perform TEST VER-2. If resistance is more than 10 ohms, replace O2 sensor. Perform TEST VER-2.
  4. If voltage for either or both O2 sensors is more than 0.1 volt in step 2), turn engine off. Replace O2 sensor(s). Perform TEST VER-2. Turn ignition on. Using DRB-II, reset adaptive fuel memory. Start engine, and allow it to reach normal operating temperature.
  5. Read right and left O2 sensor states. If both O2 sensor states are switching, repair is complete. Perform TEST VER-2. If both O2 sensor states are not switching, perform TEST NF-15A.
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