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HOMESERVICE MANUALSCHEVROLET2001C3500 HD 8.1 G, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1756 (ENGINE CONTROLS - 6.6L - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSENGINE WIRING HARNESS ASSEMBLY REPLACEMENTREMOVAL PROCEDURE
2001 Chevrolet C3500 HD 8.1 G, Automatic

Removal Procedure

2001 Chevrolet C3500 HD 8.1 G, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, 2001 Chevrolet Silverado, and 2001 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Fuel Injection Control Module Electrical Connectors
    GM786976Courtesy of GENERAL MOTORS COMPANY
  1. Disconnect negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Auxiliary Battery) , Battery Negative Cable Disconnection and Connection (Single Battery) in Engine Electrical.
  2. Remove engine sight shield.
  3. Remove air intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  4. Disconnect fuel injection control module.
    5. Fig 2: Water-In-Fuel Sensor & Fuel Heater
    GM786973Courtesy of GENERAL MOTORS COMPANY
  5. Disconnect fuel filter/heater assembly connectors.
    6. Fig 3: Right Rear Fuel Injector Electrical Connector
    GM786980Courtesy of GENERAL MOTORS COMPANY
  6. Disconnect right rear fuel injector harness connector.
    7. Fig 4: Left Front Injector Harness Electrical Connector
    GM759733Courtesy of GENERAL MOTORS COMPANY
  7. Disconnect right front fuel injector harness connector.
    8. Fig 5: Coolant Tube, Boost Sensor Electrical Connector & Bracket Nut
    GM740438Courtesy of GENERAL MOTORS COMPANY
  8. Disconnect turbo boost sensor.
    9. Fig 6: Sight Shield Hold-Down Bolt & Bracket
    GM786983Courtesy of GENERAL MOTORS COMPANY
  9. Remove sight shield hold-down bracket.
    10. Fig 7: ECT Sensor Electrical Connector
    GM740506Courtesy of GENERAL MOTORS COMPANY
  10. Disconnect coolant temperature sensor.
    11. Fig 8: View Of Turbocharger Inlet Coolant Hose
    GM668427Courtesy of GENERAL MOTORS COMPANY
  11. Remove turbo water inlet hose.
    12. Fig 9: View Of Main Engine Harness Electrical Connectors
    GM674653Courtesy of GENERAL MOTORS COMPANY
  12. Disconnect engine harness bulk connectors.
    13. Fig 10: View Of Engine-To-Chassis Harness Connector & Bracket Bolts
    GM674680Courtesy of GENERAL MOTORS COMPANY
  13. Remove bolts retaining bulk connectors to bracket.
    14. Fig 11: Turbocharged Air Hose View
    GM664853Courtesy of GENERAL MOTORS COMPANY
  14. Remove left turbo air outlet hose.
    15. Fig 12: Left Front Fuel Injector Electrical Connector
    GM786986Courtesy of GENERAL MOTORS COMPANY
  15. Disconnect left front fuel injector harness connector.
    16. Fig 13: Left Rear Fuel Injector Electrical Connector
    GM786988Courtesy of GENERAL MOTORS COMPANY
  16. Disconnect left rear fuel injector harness connector.
    17. Fig 14: Fuel Rail Temperature Sensor Electrical Connector
    GM786977Courtesy of GENERAL MOTORS COMPANY
  17. Disconnect fuel rail temperature sensor connector.
    18. Fig 15: Glow Plug Relay Electrical Connectors
    GM786978Courtesy of GENERAL MOTORS COMPANY
  18. Disconnect glow plug relay connectors.
    19. Fig 16: Oil Level Sensor Harness Connectorno Content
    GM786991Courtesy of GENERAL MOTORS COMPANY
  19. Disconnect oil level harness connector.
    20. Fig 17: BARO Sensor Electrical Connector
    GM739503Courtesy of GENERAL MOTORS COMPANY
  20. Disconnect BARO sensor connector.
    21. Fig 18: Fuel Rail Pressure Sensor Electrical Connector
    GM786994Courtesy of GENERAL MOTORS COMPANY
  21. Disconnect fuel rail pressure sensor connector.
  22. Raise vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  23. Remove front lower skid plate.
    24. Fig 19: CKP Sensor Electrical Connector
    GM786970Courtesy of GENERAL MOTORS COMPANY
  24. Disconnect crankshaft position sensor.
    25. Fig 20: View Of CMP Sensor Electrical Connector & Cooling Fan Pulley
    GM742170Courtesy of GENERAL MOTORS COMPANY
  25. Disconnect camshaft position sensor.
    26. Fig 21: Engine Harness Ground Bolts
    GM786972Courtesy of GENERAL MOTORS COMPANY
  26. Remove bolts retaining engine harness grounds.
  27. Lower vehicle.
    28. Fig 22: Fuel Pressure Regulator Electrical Connector
    GM786996Courtesy of GENERAL MOTORS COMPANY
  28. Unroute and lift engine wiring harness assembly for access to fuel rail pressure regulator.
  29. Disconnect fuel rail pressure regulator.
    30. Fig 23: Engine Wiring Harness
    GM660421Courtesy of GENERAL MOTORS COMPANY
  30. Remove engine wiring harness from vehicle.
RENDER: 1.0x

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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.