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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 REPLACEMENTINSTALLATION PROCEDURE
2001 Chevrolet C3500 HD 8.1 G, Automatic

Installation Procedure

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