Check that the throttle valve rotates smoothly and evenly.
Remove the air intake pipe from the throttle body and inspect the inside of the throttle body for soot deposits and other contaminants, especially around the throttle plate. If there is dirt, remove it with an aerosol carburetor cleaner and a toothbrush. Make sure beforehand that the aerosol cleaner will not damage the oxygen sensor and catalytic converter.
Caution: Do not clean the throttle position sensor (TPS) or the idle air control (IAC) valve
Remove the throttle assembly on a cold engine as follows:
Turn off the ignition and disconnect the ground wire from the battery.
Loosen the clamps and remove the air intake pipe.
Disconnect the accelerator cable from the throttle lever.
On pre-2001 models with an automatic transmission, disconnect the control cable from the throttle lever.
Figure 5.24. Cooling system hose connections to the throttle body
Label and disconnect the vacuum and coolant hoses from the throttle body (figure 5.24).
Close the cooling system hoses with plastic plugs to prevent coolant leakage.
Disconnect the electrical connector from the throttle position sensor (TPS).
Figure 5.25. Location of throttle body mounting bolts on pre-2001 models
Figure 5.26. Throttle body mounting bolt locations on 2001 and later models
Remove the throttle body mounting bolts (figure 5.25, 5.26).
Remove the throttle body and gasket from the intake manifold.
The engine is installed in the reverse order of removal, taking into account the following:
When installing the throttle body, use a new gasket.
Check the level and top up the coolant if necessary.
[The material was taken from a resource: toyotaman.ru]