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 cold advance relay through 20-amp GAUGES fuse. When coolant temperature is less than 80°F (27°C), as sensed by coolant temperature sensor, ECM provides a ground at terminal C6. See Figure. Grounding terminal C6 energizes cold advance relay, closing relay contacts and supplying 12 volts to cold advance solenoid (in injection pump), and glow plug controller. 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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