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.
Diesel Cold Advance System Check: Notes
With ignition on voltage is supplied to the cold advance relay through the 20-amp GAGES fuse. When coolant temperature is less than 80°F (27°C), as sensed by the coolant temperature sensor, the ECM provides a ground at terminal C6. See Figure. Grounding terminal C6 energizes the cold advance relay, closing the relay contacts and supplying 12 volts to the cold advance solenoid (in the injection pump), and the glow plug controller. The cold advance solenoid is now energized, causing injection pump timing to be advanced about 4 degrees.
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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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