Catch all tag which can refer to the "brain" of the car which can control the engine and/or transmission of the vehicle. This would include such terms as PCM (powertrain control module), ECM (engine control module), PCU (powertrain control unit), ECU (engine control unit), and many, many others.

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2003 Ram 1500 4.7 miss firing

Need a computer pin out diagram. Cylinder 3 miss firing. Need to check wiring. Plug and coil pack are good, but no spark.