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 INSPECTIONWITHOUT USING M-MDS OR EQUIVALENT

2008 Mazda 6 s Sport, 4D Hatchback, Standard

Without Using M-MDS or equivalent

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Without 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.

CAUTION:

Shorting the wrong terminal of the check connector may cause malfunctions. Make sure to short only the specified terminal.

Ground the check connector terminal F/P using the jumper wire.

Fig 1: Locating Check Connector

Courtesy of MAZDA MOTORS CORP.

Remove the fuel filler cap.
Turn the ignition switch to the ON position and verify that the fuel pump can be heard operating.
- 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 main relay, fuel pump relay, and check connector
    - Wiring harnesses, connectors between fuel pump relay, fuel pump resistor, and fuel pump
      
      Fig 2: Identifying Fuel Pump Unit Wiring Harness-Side Connector
      Courtesy of MAZDA MOTORS CORP.
Voltage 3.76-5.28 V
Disconnect the jumper wire.

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.