GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Controls - 6.6L (LB7) 🢒 Fuel Injector Control Module Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the batteries. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the air cleaner layer. Refer to Air Cleaner Replacement .
  3. Remove the duct between the air cleaner and the turbocharger inlet housing.
  4. Remove the fuel filler cap to relieve pressure.

    5. Object Number: 660358 Size: SH
  5. Remove the large tie wraps from the fuel injector control module (6) and harness.
  6. Loosen the fuel lines (3) at the fuel injection control module (6).
  7. Remove the 3 mounting bolts (1,5).
  8. Remove the insulators (2) between the fuel injection control module and bracket by lifting up the module and reaching underneath.

    9. Object Number: 744247 Size: SH

    Important: Do not break off the tab on the connector.

  9. Disconnect the wiring harness connectors (2) from the fuel injection control module (1).

    10. Object Number: 744237 Size: SH
  10. Disconnect the fuel lines (2) at the fuel injection control module (1) and discard washers.
  11. Remove the fuel injection control module (1) from the bracket.

Installation Procedure

    Object Number: 660358 Size: SH

    Important: Do not knock off the insulators when installing the fuel injector control module to the bracket.

  1. Install the fuel injection control module insulators (2) to the fuel injector control module (6).
  2. Install the fuel injection control module with mounting insulators.

    3. Object Number: 744237 Size: SH
  3. Install by hand the eyebolts and fuel lines (2) with new washers to the fuel injector control module (1).

    4. Object Number: 660358 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the fuel injection control module mounting bolts (1,5).

    5. Tighten
    Tighten the fuel injection control module mounting bolts to 25 N·m (18 lb ft).


    Object Number: 744247 Size: SH
  5. Connect the fuel injection control module connectors (2) to the fuel injection control module (1).

    6. Object Number: 660358 Size: SH
  6. Tighten the eye bolts (4) to the fuel injection control module (6).

    7. Tighten
    Tighten the eye bolts to 35 N·m (26 lb ft).

  7. Install the duct between the air cleaner and the turbocharger inlet housing.
  8. Install the air cleaner layer. Refer to Air Cleaner Replacement .
  9. Install the fuel filler cap.
  10. Connect the batteries. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  11. Depress the fuel manager primer button 30 times.
  12. Start the engine. If the engine stalls, repeat steps 10 and 11.
  13. Inspect for leaks.