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Test NTC-7A - Checking Oxygen Sensor Switching

NOTE: Perform TEST NTC-1A or NTC-6A before proceeding.
WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .
  1. Start engine. Allow engine to reach normal operating temperature of 180°F (82°C). Using scan tool, read upstream O2S state for 10 or more seconds. If upstream O2S state is switching between LEAN-RICH-LEAN twice or more within 10 seconds, upstream O2S is functioning properly. Test is complete. If upstream O2S state is not switching between LEAN-RICH-LEAN twice or more within 10 seconds, go to next step.
  2. If upstream O2S state is locked on LEAN, go to TEST NTC-7B. If upstream O2S state is not locked on LEAN, turn ignition off. Release fuel pressure. Install a fuel pressure gauge to fuel rail. Turn ignition on. Using scan tool, actuate ASD fuel system. Allow fuel pressure gauge to stabilize. Go to next step.
  3. Using scan tool, stop ASD fuel system actuation. Observe fuel pressure gauge for one minute. If fuel pressure drops more than 10 psi (0.7 kg/cm2 ), replace leaking injector(s) as necessary. Perform TEST VER-2A. If fuel pressure drops 10 psi (0.7 kg/cm2 ) or less, go to next step.
  4. Inspect air filter and inlet ducts for restrictions. If restrictions are present, clean inlet system as necessary. Perform TEST VER-2A. If restrictions are not present, go to TEST NTC-18A.
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