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.
Disabling Ignition & Fuel Systems
Remove Automatic Shutdown Relay (ASD) located in Power Distribution Center (PDC). Refer to PDC cover for proper relay location. PDC is located in engine compartment. On 5.9L diesel engines, also disconnect fuel shutdown solenoid connector. Solenoid is located behind upper intake manifold. See appropriate SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE.
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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.