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 MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 234 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM 13B-MSP))ENGINE CONTROL SYSTEM OPERATION INSPECTIONFUEL PUMP SPEED CONTROL OPERATION INSPECTION
1999 Mazda 626 ES, 2.5 D, Standard
Fuel Pump Speed Control Operation Inspection
1999 Mazda 626 ES, 2.5 D, StandardSECTION Fuel Pump Speed Control Operation Inspection
WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- 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:
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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.