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FUEL PRESSURE The fuel pressure regulator controls fuel system pressure. The PCM cannot detect a clogged fuel pump inlet filter, SECONDARY IGNITION CIRCUIT The PCM cannot detect an inoperative ignition coil, fouled or worn spark plugs, ignition cross firing, or open spark CYLINDER COMPRESSION The PCM cannot detect uneven, low, or high engine cylinder compression. EXHAUST SYSTEM The PCM cannot detect a plugged, restricted or leaking exhaust system, although it may set a fuel system fault. FUEL INJECTOR MECHANICAL MALFUNCTIONS The PCM cannot determine if a fuel injector is clogged, the needle is sticking or if the wrong injector is installed. EXCESSIVE OIL CONSUMPTION Although the PCM monitors engine exhaust oxygen content when the system is in closed loop, it cannot determine THROTTLE BODY AIR FLOW The PCM cannot detect a clogged or restricted air cleaner inlet or filter element. VACUUM ASSIST The PCM cannot detect leaks or restrictions in the vacuum circuits of vacuum assisted engine control system PCM SYSTEM GROUND The PCM cannot determine a poor system ground. However, one or more diagnostic trouble codes may be gener- PCM CONNECTOR ENGAGEMENT The PCM may not be able to determine spread or damaged connector pins. However, it might store diagnostic HB EMISSIONS 25 - 7 |