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
The PCM enables the fuel pump relay when the ignition switch is turned on. The PCM will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. PCM continues to enable fuel pump relay as long as ignition reference pulses are detected. PCM disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and ignition remains on.
NO RELATED
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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.