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.
Circuit Description
When ignition switch is first turned On, PCM energizes fuel pump relay which then applies power to in-tank fuel pump. Fuel pump relay will remain On as long as engine is running or cranking and PCM is receiving 58X crankshaft position pulses. If no 58X crankshaft position pulses are present, PCM de-energizes fuel pump relay within 2 seconds after ignition is turned On or engine is stopped. Fuel pump delivers fuel to fuel rail and injectors, then to fuel pressure regulator. Fuel pressure regulator controls fuel pressure by allowing excess fuel to be returned to fuel tank. With ignition on, fuel pump can be turned on by command from scan tool.
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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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