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 629 (FUEL SYSTEM)FUEL PUMP UNIT INSPECTIONFUEL PUMP OPERATION INSPECTIONUSING M-MDS OR EQUIVALENT

2008 Mazda 6 s Sport, 4D Hatchback, Standard

Using M-MDS or equivalent

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Using M-MDS or equivalent

WARNING: This page is about a different car, the 2008 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Connect the M-MDS or equivalent to the DLC-2.
Remove the fuel filler cap.
Turn the ignition switch to the ON position.

Fig 1: Identifying DLC-2 Connector Terminal
Courtesy of MAZDA MOTORS CORP.
Verify that the fuel pump can be heard operating when FP is changed from off to on position using simulation function FP.
- If it cannot be verified, inspect for a voltage of 3.76-5.28 V on the fuel pump wiring harness-side connector terminal B.
  - If it is within the specification, inspect the following.
    - Fuel pump continuity inspection
    - Wiring harness between fuel pump terminal D and GND
  - If not within the specification, inspect the following.
    - Fuel pump relay
    - Wiring harnesses, connectors between fuel pump relay, fuel pump resistor, and fuel pump
    - Wiring harnesses, connectors between main relay, fuel pump relay, and PCM
      
      Fig 2: Identifying Fuel Pump Unit Wiring Harness-Side Connector
      Courtesy of MAZDA MOTORS CORP.
Voltage 3.76-5.28 V

RENDER: 1.0x

NO RELATED

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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.