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.
Cold Advance System Electrical Check: Notes
With ignition on and coolant temperature below 80°F (27°C), the ECM grounds circuit No. 901 to the cold advance relay. Grounding circuit No. 901 turns on cold advance relay, to supply 12 volts to the cold advance solenoid (in the injection pump), and the glow plug controller. The cold advance solenoid is now energized, which causes the injection pump timing to be advanced about 4 degrees.
- This test will determine if problem is electrical or a malfunctioning injection pump.
- This test will determine if the ECM is able to turn on the cold advance relay.
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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.