Test NTC-7C - Checking O2S Switching (5.9L Hd)
WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
procedure.
NOTE:
BR body (heavy duty engine) is equipped with dual O2S. Scan tool displays dual O2S as LT O2S and RT O2S.
- Allow engine to reach normal operating temperature. Using scan tool, read both left and right O2S states. Raise engine speed to 1500 RPM. If both O2S states are switching, system is operating properly. Test is complete. If either O2S is locked on lean, go to TEST NTC-7D. If neither O2S is locked on lean, turn engine off.
- Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system. Allow fuel pressure to stabilize. Stop fuel system actuation. Monitor fuel gauge for one minute. If fuel pressure drops more than 10 psi (.7 kg/cm2 ), replace leaking injector(s) or "O" ring(s) as necessary. Perform TEST VER-2.
- If fuel pressure does not drop more than 10 psi (.7 kg/cm2 ), inspect air filter and air inlet ducts for restrictions. Clean restricted air inlet system as necessary. Perform TEST VER-2. If no restrictions exist, go to TEST NTC-16A.