Test NF-6A - Checking Oxygen (O2) Sensor Switching
- Allow engine to reach normal operating temperature. Using DRB-II, read O2 sensor state. If O2 sensor state is switching, system is functioning okay. Test is complete. 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 - CHECKING OXYGEN (O2) SENSOR SWITCHING . If O2 sensor is not locked on lean, go to next step.
- Turn engine off. Turn ignition switch to ON position. Using DRB-II, actuate fuel system test. Inspect injector for fuel leakage. If injector is leaking, replace leaking injector and/or "O" rings as necessary. Perform VERIFICATION TEST VER-3 . If injector is not leaking, go to next step.
- Using DRB-II, stop fuel system test. Inspect air cleaner filter and inlet ducts for restrictions. If any restrictions exist, clean restricted air inlet system as necessary. Perform VERIFICATION TEST VER-3 . If restrictions do not exist, perform TEST NF-13A - PERFORMING NO FAULT CODE MECHANICAL TEST .