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Home >> Dodge and Ram >> 1994 >> Grand Caravan Base, 31TH >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.8L >> Self-Diagnostic Tests >> Test NTC-7A - Checking Oxygen (O2) Sensor Switching

Test NTC-7A - Checking Oxygen (O2) Sensor Switching

WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE  procedure in this article.
  1. Allow engine to reach normal operating temperature. Using DRB, read O2 sensor state. If O2 sensor state is switching, system is functioning properly. 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, go to TEST NTC-7B. If O2 sensor is not locked on lean, go to next step.
  2. Turn engine off. Remove upper half of intake manifold. Turn ignition on. Using DRB, actuate fuel system. Inspect injectors for fuel leakage. If injectors are leaking, replace leaking injectors or "O" rings as necessary. Perform TEST VER-2  .
  3. If injectors are not leaking, stop fuel system actuation. Turn ignition off. Reinstall upper half of intake manifold. Inspect air cleaner and inlet ducts for restrictions. Repair as required. Perform TEST VER-2. If no restrictions are observed, go to TEST NTC-16A  .
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