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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