GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Engine 🢒 Engine Exhaust 🢒 Supercharger Replacement

Tools Required
    • EN 46109 Guide Pins
    • EN-47748 Supercharger Lift Bracket
    • EN-47833 Supercharger Service Holding Fixture

Removal Procedure
  1. Remove the hood. Refer to Hood Replacement .
  2. Remove the cross vehicle brace. Refer to Cross Vehicle Brace Replacement .
  3. Remove the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .
  4. Remove the wiper arm assemblies. Refer to Windshield Wiper Arm Replacement .
  5. Remove the air inlet grille. Refer to Air Inlet Grille Panel Replacement .
  6. Remove the wiper motor module. Refer to Windshield Wiper System Module Replacement .
  7. Remove the air inlet housing front panel. Refer to Air Inlet Housing Front Panel Replacement .
  8. Remove the front and rear supercharger inlet duct assemblies. Refer to Supercharger Inlet Duct Assembly Replacement .
  9. Drain the charge air cooling system. Refer to Charge Air Cooling System Draining and Filling .

    10. Important: Do not allow coolant to contact the supercharger drive belt.

    Place a shop rag under the front portion of the supercharger to catch any remaining coolant.


    Object Number: 1614613 Size: SH
  10. Remove the front portion of the supercharger front manifold (2). It is not necessary to remove the hoses from the manifold. Discard the manifold O-ring seals. Position the hoses with manifold aside. Refer to Charge Air Cooler Front Manifold Replacement .

    11. Object Number: 1614611 Size: SH
  11. Remove the fuel injector rail assembly (1). Refer to Fuel Injector and Fuel Rail Replacement .

    12. Object Number: 1644600 Size: SH
  12. Disconnect the throttle body electrical connector (3).
  13. Disconnect the evaporative emission (EVAP) canister purge solenoid valve electrical connector (7).

    14. Object Number: 1614014 Size: SH
  14. Disconnect the supercharger bypass regulator solenoid valve electrical connector (3).

    15. Object Number: 1614002 Size: SH
  15. Disconnect the manifold absolute pressure (MAP) sensor vacuum line (2) from the supercharger.
  16. Disconnect the supercharger intake air temperature (IAT) sensor electrical connector.

    17. Object Number: 1614007 Size: SH
  17. Disconnect the supercharger inlet absolute pressure (SIAP) sensor vacuum line fitting (1) from the rear of the supercharger. Position the sensors, vacuum lines, and wire harness aside.

    18. Object Number: 1614012 Size: SH
  18. Disconnect the positive crankcase ventilation (PCV) tube fitting (1) from the right camshaft cover.
  19. Remove the supercharger drive belt. Refer to Supercharger Belt Replacement .

    20. Caution: The supercharger must be lifted with the EN 47748. The weight of the supercharger assembly is approximately 34 kg (75 lb) and could cause injury if lifted by hand.

    Notice: The supercharger must be lifted with the EN 47748. Damage could occur to the finish and/or components of the supercharger and surrounding engine or vehicle components.


    Object Number: 1614620 Size: SH
  20. Install the EN-47748  (1-5) to the supercharger.

    21. Object Number: 1614621 Size: SH
  21. Install an engine hoist to the EN-47748 .
  22. Remove the supercharger.

    23. Notice: The EN 47833 must be installed to the supercharger in order to prevent damage to the supercharger bypass actuator cable and the finish of the supercharger. Failure to use the EN 47833 can lead to bending the brackets of the supercharger bypass actuator cable. Bent supercharger bypass actuator cable brackets will cause the supercharger bypass valve to function improperly.


    Object Number: 1614697 Size: SH
  23. Install the EN-47833 to the supercharger while the supercharger is suspended by the engine hoist.
  24. Place the supercharger on a workbench and remove the engine hoist.
  25. If replacing the supercharger, transfer the necessary parts.
  26. Remove the supercharger gaskets from the engine.
  27. Clean and inspect the supercharger. Refer to Supercharger Cleaning and Inspection .
  28. Clean and inspect the supercharger mating surface on the engine.

Installation Procedure

    Object Number: 1614616 Size: SH
  1. Install the new supercharger gaskets to the engine.

    2. Object Number: 1614619 Size: SH
  2. Install the appropriate size guide pins (1, 2) from the EN 46109 alignment pin set to the engine as shown.

    3. Object Number: 1614697 Size: SH
  3. If previously removed, install the EN-47748 to the supercharger.
  4. Install an engine hoist to the EN-47748 and raise the supercharger off the workbench.
  5. Remove the EN-47833 from the supercharger.
  6. Inspect the gasket surface on the supercharger and clean as necessary.

    7. Object Number: 1614621 Size: SH
  7. Ensure that all wiring and vacuum lines are positioned aside and install the supercharger to the engine.
  8. Remove the engine hoist and the EN-47748 .
  9. Remove the EN 46109 alignment pins.

    10. Object Number: 1656777 Size: SH
  10. Loosely install the supercharger bolts.

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


    Object Number: 1743698 Size: SH
  11. Tighten the supercharger bolts in sequence as shown.

    12. Tighten
    Tighten the supercharger bolts to 25 N·m (18 lb ft).


    Object Number: 1614012 Size: SH
  12. Install the supercharger drive belt. Refer to Supercharger Belt Replacement .
  13. Connect the PCV tube fitting (1) to the right side camshaft cover.

    14. Object Number: 1614007 Size: SH
  14. Connect the SIAP sensor vacuum line fitting (1) to the rear of the supercharger.

    15. Object Number: 1614002 Size: SH
  15. Connect the supercharger IAT sensor electrical connector.
  16. Connect the MAP sensor vacuum line fitting (2) to the supercharger.

    17. Object Number: 1614014 Size: SH
  17. Connect the supercharger bypass regulator solenoid valve electrical connector (3).

    18. Object Number: 1644600 Size: SH
  18. Connect the EVAP canister purge solenoid valve electrical connector (7).
  19. Connect the throttle body electrical connector (3).

    20. Object Number: 1614611 Size: SH
  20. Install the fuel injector rail assembly (1).

    21. Object Number: 1614613 Size: SH
  21. Using NEW O-rings, install the front portion of the supercharger front manifold (2). Refer to Charge Air Cooler Front Manifold Replacement .
  22. Install the front and rear supercharger inlet duct assemblies. Refer to Supercharger Inlet Duct Assembly Replacement .
  23. Install the air inlet housing front panel. Refer to Air Inlet Housing Front Panel Replacement .
  24. Install the wiper motor module. Refer to Windshield Wiper System Module Replacement .
  25. Install the air inlet grille. Refer to Air Inlet Grille Panel Replacement .
  26. Install the wiper arm assemblies. Refer to Windshield Wiper Arm Replacement .
  27. Install the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .
  28. Install the cross vehicle brace. Refer to Cross Vehicle Brace Replacement .
  29. Install the hood. Refer to Hood Replacement .
  30. Fill the charge air cooling system with coolant and check for leaks. Refer to Charge Air Cooling System Draining and Filling .