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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 557 (ENGINE CONTROLS - 3.4L (TROUBLESHOOTING & DIAGNOSIS))TROUBLESHOOTINGSYMPTOMS - ENGINE CONTROLSVISUAL/PHYSICAL CHECK
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Visual/Physical Check

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Visual/Physical Check
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the connector test adapter kit J 35616-A for any test that requires probing the following items:
  • The PCM harness connectors
  • The electrical center fuse/relay cavities
  • The component terminals
  • The component harness connector

Using this kit will prevent damage caused by the improper probing of connector terminals.

Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a problem without further tests and can save valuable time. This inspection should include the following areas:

  • Inspect the PCM grounds for being clean, tight, and in their proper location. Refer to Master Electrical Component List and Power and Grounding Component Views in Wiring Systems.
  • Inspect vacuum hoses for splits, kinks, and proper connections, as shown on Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction. Refer to Emission Hose Routing Diagram .
  • Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking, especially between the (MAF) sensor and the throttle body.
  • Inspect for air leaks at throttle body mounting area, MAF sensor and intake manifold sealing surfaces.
  • Inspect the wiring harness for poor connections, pinches, cuts, or other damage.
  • Inspect for loose, damaged, or missing sensors/components.

Use the following tables when diagnosing a symptom complaint:

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.