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.
Fuel Pump Control System (I30)
- Remove fuel pump relay. See Fig 1 . Turn ignition switch to RUN position. Check for battery voltage between ground and fuel pump relay harness connector terminal No. 1 (Brown wire) and terminal No. 3 (Black/White wire). If battery voltage is present, go to next step. If battery voltage is not present, check wiring connectors, fuse No. 17 (10-amp) and fuse No. 32 (15-amp) in fuse box.
- Turn ignition switch to LOCK position. Disconnect fuel pump. Disconnect dropping resistor harness connector. See Fig 2
. Check continuity as follows:
- Between dropping resistor harness connector terminal No. 1 (Green/Red wire) and fuel pump harness connector terminal No. 2 (Green/Red wire).
- Between fuel pump harness connector terminal No. 1 (Black/Yellow wire) and fuel pump relay harness connector terminal No. 5 (Black/Yellow wire).
- Between ground and dropping resistor harness connector terminal No. 2 (Black wire).
If continuity exists, go to next step. If continuity does not exists, repair fault in appropriate circuit.
- Leave ignition off. Disconnect PCM harness connector. Check continuity between fuel pump relay harness connector terminal No. 2 (Black/Pink wire) and PCM harness connector terminal No. 11 (Black/Pink wire). If continuity does not exists, repair fault in circuit. If continuity exists, check fuel pump. If fuel pump is okay, test fuel pump relay. See RELAYS under RELAYS & SOLENOIDS.
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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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