Control Unit

The electronic control unit is located in a metal housing on the firewall or fenderwell. A switching transistor is exposed on top for cooling. The control unit is connected to the rest of the system by a wiring harness and a 4 pin plug (4 cylinder models use a 5 pin plug). The control unit functions when the ignition is switched to "START" or "ON". It allows current to flow through the primary side of the coil, creating a magnetic field.