Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 are applied to the glow plugs. If coolant temperature is below 86°F (30°C), relay No. 2 will close also. After 3 seconds, control module turns off "Wait-to-Start" lamp indicating engine is ready to be started.
If ignition is left on for 3 seconds more without cranking, the control module opens relay No. 1 to prevent glow plugs from overheating. However, if coolant temperature is below 86°F (30°C) when relay No. 1 opens, 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 when vehicle is under way (clutch and neutral switches closed).
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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