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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (ENGINE CONTROL SYSTEM - SYSTEM & COMPONENT TESTING)FUEL SYSTEMSFUEL PUMP ELECTRICAL CIRCUIT DIAGNOSISDIAGNOSTIC AIDS
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Diagnostic Aids

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Aids
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Check for any of the following conditions:

  • The resistance of the circuit opening relay, the resistance across terminals No. 2 and 3 is 85-95 ohms at 68°F (20°C). The resistance across terminals No. 1 and 4 is infinite.
  • The circuit opening relays electrical contacts may be pitted or sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
  • The performance of the circuit opening relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes.
An intermittent malfunction may be caused by a fault in the fuel pump electrical circuit. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article. See Figure .

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.