CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Throttle Body

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Removal & Installation



2.8L & 3.6L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition OFF .
  4.  
  5. Remove the air cleaner intake duct.
  6.  
  7. Remove the throttle body electrical connector.
  8.  
  9. Unlock and reposition the wiring harness conduit.
  10.  
  11. Remove the throttle body bolts.
  12.  
  13. Remove the throttle body and gasket.
  14.  

To install:

  1. Carefully clean the throttle body mounting surfaces of any gasket and/or seal material.
  2.  
  3. Install the throttle body and NEW gasket.
  4.  
  5. Install the throttle body bolts and tighten to 89 inch lbs. (10 Nm).
  6.  
  7. Install the wiring harness conduit.
  8.  
  9. Install the throttle body electrical connector.
  10.  
  11. Install the air cleaner intake duct.
  12.  
  13. Perform the idle learn procedure as follows:
    1. Ensure that the following conditions are met: The vehicle is stopped, the accelerator pedal angle is less than 14.9 percent, the battery voltage is more than 10 volts, the Engine Coolant Temperature (ECT) is between 5-60°C (41-140°F) and the Intake Air Temperature (IAT) is more than 5-60°C (41-140°F).
    2.  
    3. Turn OFF the ignition for 30 seconds.
    4.  
    5. Turn ON the ignition, with the engine OFF for 1 minute.
    6.  
    7. Turn OFF the ignition.
    8.  
    9. Clear DTCs as necessary.
    10.  

  14.  

4.6L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the fuel injector sight shield.
  4.  
  5. Remove the air cleaner outlet duct.
  6.  
  7. Disconnect the Positive Crankcase Ventilation (PCV) fresh air tube quick connect fittings at the camshaft cover and the air cleaner outlet duct.
  8.  
  9. Remove the PCV fresh air tube.
  10.  
  11. Disconnect the engine harness electrical connector from the throttle actuator.
  12.  
  13. Remove the transaxle vent hose clip from the shift cable bracket.
  14.  
  15. Remove the transaxle shift cable clip from the shift cable bracket.
  16.  
  17. Remove the throttle body bolts.
  18.  
  19. Remove the shift cable bracket.
  20.  
  21. Remove the throttle body.
  22.  
  23. Remove and discard the throttle body seal.

    Click image to see an enlarged view

    Fig. View of 4.6L throttle body removal

  24.  

To install:

  1. Install a new throttle body seal.
  2.  
  3. Position the throttle body.
  4.  
  5. Position the shift cable bracket.
  6.  
  7. Install the throttle body bolts and tighten to 89 inch. lbs. (10 Nm).
  8.  
  9. Install the transaxle shift cable clip to the shift cable bracket.
  10.  
  11. Install the transaxle vent hose clip to the shift cable bracket.
  12.  
  13. Connect the engine harness electrical connector to the throttle actuator.
    NOTE
    Route the PCV fresh air tube under the vacuum brake booster hose and the Evaporative Emission (EVAP) purge valve.

  14.  
  15. Install the PCV fresh air tube.
  16.  
  17. Connect the PCV fresh air tube quick connect fittings at the camshaft cover and the air cleaner outlet duct.
  18.  
  19. Install the air cleaner outlet duct.
  20.  
  21. Install the fuel injector sight shield.
  22.  

5.7L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the fuel injector sight shield.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Partially drain the cooling system in order to allow the hoses at the throttle body to be removed.
  8.  
  9. Lower the vehicle.
  10.  
  11. Loosen the air cleaner outlet duct clamps.
  12.  
  13. Remove the air cleaner outlet duct.
  14.  
  15. Disconnect the air control valve electrical connector.
  16.  
  17. Disconnect the Throttle Position (TP) sensor electrical connector.
  18.  
  19. Disconnect the crankcase ventilation hose from the throttle body.
  20.  
  21. Disconnect the coolant hoses from the throttle body.
  22.  
  23. Remove the throttle body attaching bolts.
  24.  
  25. Remove the throttle body and the gasket.
  26.  
  27. Discard the throttle body gasket.
  28.  
  29. Inspect the crankcase ventilation hose and the tube. Replace any damaged components.
  30.  

To install:

  1. Install a new throttle body gasket.
  2.  
  3. Connect the coolant hoses to the throttle body.
  4.  
  5. Install the throttle body assembly.
  6.  
  7. Install the throttle body attaching bolts and tighten to 106 inch lbs. (12 Nm).
  8.  
  9. Connect the TP sensor electrical connector.
  10.  
  11. Connect the crankcase ventilation hose to the throttle body.
  12.  
  13. Connect the air control valve electrical connector.
  14.  
  15. Install the air cleaner outlet duct and clamps.
  16.  
  17. Connect the intake air temperature sensor electrical connector.
  18.  
  19. Refill the cooling system.
  20.  
  21. Check for complete throttle opening and closing positions by operating the accelerator pedal. Monitor the throttle angles, using a scan tool. The accelerator pedal should operate freely without binding between full closed throttle and wide open throttle.
  22.  
  23. Start the engine.
  24.  
  25. Check for coolant leaks.
  26.  
  27. Install the fuel injector sight shield.
  28.  

6.0L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the engine sight shield.
  4.  
  5. Remove the air cleaner outlet duct.
  6.  
  7. Disconnect the throttle body electrical connector.
  8.  
  9. Remove the throttle body attaching bolts.
  10.  
  11. Remove the throttle body and the gasket.
    NOTE
    Do not reuse the throttle body gasket. Install a new gasket during assembly.

  12.  
  13. Discard the throttle body gasket.

    Click image to see an enlarged view

    Fig. Throttle body (508) gasket (509) and mounting bolt (538)

  14.  

To install:

  1. Install a new throttle body gasket.
  2.  
  3. Install the throttle body assembly.
  4.  
  5. Install the throttle body attaching bolts and tighten to 106 inch lbs. (12 Nm).
  6.  
  7. Connect the throttle body electrical connector.
  8.  
  9. Install the air cleaner outlet duct.
  10.  
  11. Check for complete throttle opening and closing positions by operating the accelerator pedal. Monitor the throttle angles, using a scan tool. The accelerator pedal should operate freely without binding between full closed throttle and wide open throttle.
  12.  
  13. Install the engine sight shield.
  14.  

 
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