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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 271 (FUEL SYSTEM)FUEL PUMP UNIT INSPECTIONFUEL PUMP OPERATION INSPECTION

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Fuel Pump Operation Inspection

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Fuel Pump Operation Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Ground the following PCM terminals using a jumper wire.
- With immobilizer system: 1AR
- Without immobilizer system: 1AQ
Remove the fuel-filler cap.
Turn the ignition switch to the ON position to start the fuel pump.
Verify that operation sound is heard from the fuel pump when the ignition switch is turned to the ON position.

Fig 1: Identifying PCM Wiring Harness Side Connector Terminals
Courtesy of MAZDA MOTORS CORP.
- If the operation sound cannot be verified, measure the voltage at fuel pump wiring harness-side connector terminal A.
  - If as specified, inspect the following:
    - Fuel pump continuity
  - If not within the specification, inspect the following:
    - Fuel pump relay
    - Wiring harnesses and connectors between main relay, fuel pump relay and fuel pump
      
      Fig 2: Identifying Fuel Pump Unit Connector Terminals
      Courtesy of MAZDA MOTORS CORP.
1. Standard B+ (Ignition switch at ON)

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.