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Powertrain Control Module

Advanced integration of the PCM is increasingly evident in the EI system. The PCM has taken over the vital role of precisely determining when the spark is needed to ignite the air-fuel mixture. Operating conditions are input by crankshaft, camshaft, throttle position, knock, and other sensors. Engine speed in revolutions per minute (RPM), throttle position, and coolant temperature are some of the data collected, compared, and used to determine the spark timing. The PCM monitors inputs from the sensors and makes adjustments as needed so the engine can operate efficiently. An ignition timing malfunction may be a sign of a loose, dirty, or worn sensor not sending the correct input information to the PCM.