GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 TrailBlazer - 2WD 🢒 Body 🢒 Wiring Systems 🢒 Throttle Body Assembly Replacement

Removal Procedure

    Notice: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type.

    Important: 

       • DO NOT for any reason, insert a screwdriver or other small hand tool into the throttle body to hold open the throttle plate, as the throttle body could be damaged.
       • An 8-digit part identification number is stamped on the throttle body casting. Refer to this number if servicing, or part replacement is required.

  1. Partially drain the cooling system in order to allow the hose at the throttle body to be removed. Refer to Cooling System Draining and Filling .

    2. Object Number: 898123 Size: SH
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .

    3. Object Number: 1522415 Size: SH
  3. Disconnect the throttle actuator motor electrical connector (1) from the throttle actuator motor (2).

    4. Object Number: 901492 Size: SH
  4. Reposition the throttle body hose clamp.
  5. Remove both of the throttle body engine coolant hoses from the throttle body.

    6. Object Number: 1401966 Size: SH
  6. Remove the throttle body bolts (538) and nuts (507).

    7. Important: Do not reuse the throttle body gasket. Install a new gasket during assembly.

  7. Remove the throttle body (508) and gasket (509). Discard the gasket.

Installation Procedure

    Object Number: 1401966 Size: SH
  1. Install a NEW throttle body gasket (509).
  2. Install the throttle body (508).

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

  3. Install the throttle body bolts (538) and nuts (507).

    4. Tighten
    Tighten the bolts/nuts to 6 N·m (53 lb in).


    Object Number: 901492 Size: SH
  4. Connect the 2 throttle body engine coolant hoses to the throttle body.
  5. Position the throttle body hose clamps.

    6. Object Number: 1522415 Size: SH
  6. Connect the throttle actuator motor electrical connector (1) to the throttle actuator motor (2).

    7. Object Number: 898123 Size: SH
  7. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  8. Refill the cooling system. Refer to Cooling System Draining and Filling .
  9. Verify that the vehicle meets the following conditions:
    10. • The vehicle is not in a reduced engine power mode.
    • The ignition is ON.
    • The engine is OFF.
  10. Connect a scan tool in order to test for a proper throttle-opening and throttle-closing range.
  11. Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
  12. Start the engine.
  13. Inspect for coolant leaks.