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.
2003 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE
Fuel Pump Circuit
- Fuel pump is located inside fuel tank. Locate DLC-1 on left side of engine compartment. Connect a fused jumper wire between DLC-1 "F/P" terminal and body ground. See Fig 1. Remove fuel filler cap. Turn ignition on. Listen for fuel pump operation at fuel filler pipe. If fuel pump does not operate, go to next step. If fuel pump operation is heard, reinstall fuel filler cap. Testing is complete.
- Disconnect fuel pump 4-pin harness connector. Refer to FUEL PUMP under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Using DVOM, check for continuity between fuel pump 4-pin connector terminals "B" and "D". See Fig 2, Fig 3 or Fig 4 . If continuity is not present, replace fuel pump. If continuity is present, check for open or short circuit in wiring harness between fuel pump, fuel pump relay and body ground. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
Factory Service Tools
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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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