OEM 2003 Toyota Sienna Throttle Body

2003 Toyota Sienna Parts Questions & Experts Answers

• Q: How to service and repair the throttle body on 2003 Toyota Sienna?

  A: Service and repair procedures for the throttle body start with draining engine coolant followed by pulling out the V-bank cover through the operation of a 5 mm hexagon wrench to remove those three cap nuts while counterclockwise loosening and making sure the fastener slides down correctly during reinstallation. First detach both the PCV hose and vacuum hose followed by a clamp loosening process that leads to air cleaner hose extraction with its integrated resonator. Disconnect both the accelerator cable and throttle cable before removing the throttle body by unbolted it from the bracket with 19.5 N.m (200 kgf.cm, 14 ft.lbf) torque while disconnecting its connectors including throttle position sensor and IAC valve along with wire clamp removal and detachment of water bypass hoses, air assist hose, fuel vapor feed hose, and vacuum hoses. To install the throttle body maintain a torque of 29 N.m (300 kgf.cm, 22 ft.lbf) on the new gasket placed onto the air intake chamber while threading in the 3 nuts. Under vacuum conditions use a MITYVAC to check for throttle stop screw clearance from throttle lever while ensuring that no clearance exists and then measure adjust screw to throttle lever clearance before necessary adjustments. Follow the initial testing procedures and untighten both lock nuts and screw adjustments before setting the specified screw positions before tightening the lock nuts. The tech should replace the throttle position sensor by putting in a new component after proper placement and installing new gaskets and O-rings then set the torque to 6.9 N.m (70 kgf.cm, 61 in.lbf). The procedure to install these components follows the reverse order established for removal.