GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L (LLY) 🢒 Fuel Injector Control Module Replacement

Removal Procedure

    Object Number: 1334881 Size: SH
  1. Disconnect the negative battery cable . Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the fuel fill cap in order to relieve the fuel pressure.
  3. Cut the tie strap attaching the harness to the bracket.
  4. Disconnect the fuel injection control module (FICM) electrical connectors.

    5. Pull the retainers out until the connectors disengage.


    Object Number: 1334883 Size: SH
  5. Remove and discard the fuel line eyebolt washers from the banjo fittings.

    6. Object Number: 1334885 Size: SH
  6. Remove the FICM bolts.
  7. Remove the FICM with insulators.

    8. Object Number: 1334847 Size: SH
  8. If necessary, remove the oil level indicator tube bracket bolt from the FICM bracket.
  9. If necessary, remove the fuel line and engine harness clips from the FICM bracket.

    10. Object Number: 1334906 Size: SH
  10. If necessary, remove the FICM bracket bolts.
  11. If necessary, remove the FICM bracket.

Installation Procedure

    Object Number: 1334906 Size: SH
  1. If necessary, install the FICM bracket.
  2. If necessary, install the FICM bracket bolts.

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1334847 Size: SH
  3. If necessary, install the fuel line and engine harness clips to the FICM bracket.
  4. If necessary, install the oil level indicator tube bracket bolt to the FICM bracket.

    5. Tighten
    Tighten the bolt to 21 N·m (15 lb ft).


    Object Number: 1334885 Size: SH

    Important: Ensure that the insulators do not get knocked off when installing the FICM to the bracket.

  5. Install the FICM with insulators.
  6. Install the FICM bolts.

    7. Tighten
    Tighten the bolt to 20 N·m (14 lb ft).


    Object Number: 1334883 Size: SH
  7. Lubricate the NEW eyebolt washers with diesel fuel prior to installing.
  8. Install the NEW eyebolt washers to the banjo fittings.
  9. Install the fuel line eyebolts.

    10. Tighten
    Tighten the bolt to 34 N·m (25 lb ft).


    Object Number: 1334881 Size: SH
  10. Connect the FICM electrical connectors.

    11. Slide the retainers in to engage the connectors.

  11. Install a NEW tie strap attaching the harness to the bracket.
  12. Connect the negative battery cable . Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  13. Install the fuel fill cap.
  14. Prime the fuel system. Refer to Fuel System Priming .
  15. Start the engine. If the engine stalls, repeat the above step.
  16. Once the engine starts, inspect for fuel leaks.