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
Fuel pump circuit (low pressure side) consists of engine control computer, fuel pump assembly (low pressure side) and fuel pump control computer assembly that operates the fuel pump assembly (low pressure side). Based on engine output, engine control computer determines the speed of fuel pump assembly (low pressure side). The speed is converted into the load signal, and the signal is transmitted to the fuel pump control computer assembly. Based on the signal transmitted from the engine control computer, the fuel pump control computer assembly adjusts the operating speed of the fuel pump (low pressure side).
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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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