Afterglow & Quick Start System
This system consists of 4 glow plugs, control module, 2 relays, glow plug resistor assembly, coolant temperature switch, clutch and neutral switches, and connecting wiring.
When ignition is "ON", a Wait-to-Start lamp on the instrument cluster lights. When the lamp lights, relay No. 1 closes and 12 volts is applied to glow plugs. If coolant temperature is below 86°F (30°C), relay No. 2 will close. After 2 seconds, control module turns off Wait-to-Start lamp indicating engine is ready to be started.
If ignition is left on for more than 3 seconds without cranking, module opens relay No. 1 to prevent glow plugs from overheating. However, if coolant temperature is below 86°F (30°C), No. 2 relay remains closed. This applies 4.2-5.3 volts to the glow plugs through the glow plug resistor.
The control module cuts off current to glow plugs (No. 2 relay open) when coolant temperature is above 86°F (30°C) or vehicle is under way (clutch and neutral switches closed).