Chrysler Colt/Vista 1990-1993 Repair Information

System Components


MPI Control Unit

The MPI (engine controller) continuously monitor various engine sensors. The computer will then electronically advance or retard the ignition timing to provide even driveability during operation.

Power Transistor

The power transistor(s) use the signal provided by the MPI to control the ignition coil primary circuit.

Ignition Coil

The ignition coil(s) transforms the ignition primary voltage to a high secondary voltage, necessary to fire the spark plugs.


The distributor distributes the secondary voltage from the ignition coil to each spark plug. It also provides a signal to the MPI, which controls the timing of the spark at the spark plug.

Crank Angle Sensor

The crank angle sensor provides the MPI with engine speed and crank shaft position informations.