Glow Plug System: Description and Operation

Glow Plug Circuit:

PURPOSE
The glow plug system is used to preheat the chamber as an aid to cold starting.

CONSTRUCTION
^ 8 six volt glow plugs.
^ Controller/glow plug relay assembly.
^ "WAIT" Lamp.
^ ECM/PCM (Computer).

OPERATION
In the diesel engine, air alone is compressed in the cylinder. After the air has been compressed a charge of fuel is sprayed into the cylinder, where ignition occurs due to the heat of compression.

The glow plug temperature inhibit is controlled by the ECM which receives temperature information from the coolant temperature sensor, located in the water crossover on the engine. The computer sends a voltage signal to the cold advance relay and the ignition circuit to the glow plug controller. The relay is located at the junction block in the engine compartment on the right side of the cowl.