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.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 436 (FUEL SYSTEM)FUEL PUMP UNIT INSPECTIONFUEL PUMP CONTROLLING SYSTEM INSPECTIONWITHOUT USING WDS OR EQUIVALENT
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Without Using WDS or equivalent
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Without Using WDS or equivalent
WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- Practice the fuel pump operation inspection.
- Verify that there is an operation sound from the fuel pump speed control relay when the engine cranks.
- If the operation sound cannot be verified, inspect the following and repair or replace the malfunctioning part.
- Stuck fuel pump speed control relay
- Wiring harnesses, connectors between the fuel pump speed control relay and PCM terminal 4M
- If the operation sound cannot be verified, inspect the following and repair or replace the malfunctioning part.
- Verify that the rotation sound of the fuel pump is higher (higher frequency) than when idling when idling while the engine cranking.
- If it cannot be verified, inspect the following inspections and repair or replace the malfunctioning part.
- Stuck fuel pump speed control relay
- Fuel pump resistor
- Wiring harnesses open circuit between fuel pump speed control relay and fuel pump
- Wiring harnesses, connectors between fuel pump speed control relay and PCM
- If it cannot be verified, inspect the following inspections and repair or replace the malfunctioning part.
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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.