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Secondary Ignition Circuit - The PCM cannot detect an inoperative ignition coil, fouled or worn spark Engine Timing - The PCM cannot detect an incor- rectly indexed timing chain, camshaft sprocket and 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. Fuel Injector Malfunctions - The PCM cannot determine if the fuel injector is clogged, the pintle is Excessive Oil Consumption - Although the PCM monitors exhaust stream oxygen content when the Throttle Body Air Flow - The PCM cannot detect a clogged or restricted air cleaner inlet or filter element. Evaporative System - The PCM will not detect a restricted, plugged or loaded evaporative purge canis- Vacuum Assist - Leaks or restrictions in the vacuum circuits of vacuum assisted engine control PCM System Ground - The PCM cannot determine a poor system ground. However, a diagnostic trouble PCM Connector Engagement - The PCM cannot determine spread or damaged connector pins. How- HIGH AND LOW LIMITS The powertrain control module (PCM) compares in- put signal voltages from each input device with estab- DIAGNOSTIC TROUBLE CODE DESCRIPTION When a diagnostic trouble code appears, it indicates the powertrain control module (PCM) has recognized Ä FUEL SYSTEMS 14 - 101 |