Glow Plug/Controller

The glow plug controller is a solid state device which operates the glow plugs. The glow plug controller is connected to the following circuits:

• The fuel heater ignition 1 voltage circuit
• The battery voltage circuit
• The CAN communication circuit located between the engine control module (ECM) and the glow plug controller
• The engine ground circuit
• The glow plug supply voltage circuits located between the glow plug controller and the glow plugs.

The glow plug diagnostic circuits are directly monitored individually by using a separate transistor to control current to each glow plug. Individual diagnosis is thus possible for every glow plug.