The Powertrain Control Module (PCM) is the control
center of the vehicle. It controls the following items:

•  The fuel metering system

•  The transaxle/transmission shifting

•  The ignition timing

•  The on-board diagnostics for powertrain functions

It constantly looks at the information from various
sensors, and controls the systems that affect vehicle
performance. The PCM also performs the diagnostic
function of the system. It can recognize operational
problems, alert the driver through the MIL, and store
diagnostic trouble codes which identify the problem
areas to aid the technician in making repairs.
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