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.
2004 Mazda RX-8 1.3 NFACTORY OEM SERVICE PROCEDURE
Fuel Pump Speed Control Operation Inspection
- Perform the fuel pump operation inspection.
- Verify that fuel pump relay operation sound is heard, while cranking the engine.
- If operation sound is not heard, inspect the following:
- Fuel pump relay
- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM terminal 4M)
- If operation sound is not heard, inspect the following:
- Remove the fuel-filler cap.
- Verify that the fuel pump unit operation sound frequency at cranking is higher than during idle.
- If it cannot verified, inspect for the following:
- Fuel pump resister
- Fuel pump relay
- Wiring harnesses and connectors (open circuit at fuel pump relay terminal C-fuel pump terminal B)
- If it cannot verified, inspect for the following:
Factory Service Tools
Use the Manual With the Right Hardware
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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.