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Powertrain Control Module (Pcm)

The Powertrain Control Module (PCM) has memory storage and a permanent diagnostic trouble code memory. Always check with vehicle manufacturer for latest PCM application. New PCM must be coded with the Volkswagen Audi Group (VAG) 1551 scan tool when installed in vehicle. See SELF-DIAGNOSTICS - INTRODUCTION article for PCM coding information.

The PCM receives input signals from various engine sensors. These input signals are used to control idle speed, fuel delivery and ignition timing to maintain optimum performance, fuel economy and emission standards.

NOTE: Components are grouped into 2 categories: input (sensor) devices and output (actuator) signals. INPUT DEVICES  are components that control or produce voltage signals monitored by PCM. OUTPUT SIGNALS  are components controlled by PCM.
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