Contents: Examination ↓ Removal and installation ↓
Examination
1. On 1999-2003 models, make sure the throttle linkage operates smoothly.
2. Remove the intake air duct from the throttle body and inspect the body for carbon or other deposits. If there is any dirt, clean it with an aerosol carburetor cleaner (make sure there is a special indication that this product is safe for oxygen sensors and catalytic converters) and a toothbrush (Fig. 13.2).
Fig. 13.2. Take an aerosol carburetor cleaner, a toothbrush and a rag and with the engine off, clean the throttle body passage. Open the throttle so that you can clean the area behind it
Caution: Do not use solvents to clean the throttle position sensor or idle speed control valve.
Removal and installation
Caution: Wait until the engine has cooled down completely before starting this procedure.
Models 2001-2003.
3. Disconnect the ground cable from the battery (see paragraph 1 of chapter 5).
4. Remove the air intake duct (see paragraph 9).
5. Disconnect the throttle position sensor electrical connector.
6. Disconnect the idle speed control valve electrical connector.
7. Disconnect the cruise control cable from the throttle body (fig. 13.7, a, b).
Fig. 13.7, a. To release the cruise control cable from the corresponding bracket, loosen the lock nut (A) and the adjusting race (B), and then slide the cable out of the bracket (the model with V6 engine is shown, similar for models with four-cylinder engine)
Fig. 13.7, b. To disconnect the cruise control cable from the throttle cam, align the cable with the groove on the side of the cam, and then pull the end of the cable out of the cam (they showed a model with a V6 engine, similar for models with a four-cylinder engine)
8. Disconnect the accelerator cable from the throttle body (fig. 10.2 and 10.3).
9. Disconnect the brake booster vacuum hose from the throttle body (Fig. 13.9).
Fig. 13.9. Before removing the throttle body, disconnect the brake booster vacuum hose (A) and vacuum hoses (B), disconnect the throttle position (TP) sensor (C) and idle speed (ISO) control valve (B) electrical connectors, and disconnect the coolant hoses (E)
10. Disconnect the vacuum hoses from the throttle body.
[The original can be found on this resource: www.ToyotaMan.ru]
11. Clamp the coolant hoses going to the throttle body to minimize fluid leakage. Plug the hoses to prevent fluid leakage.
12. Disconnect the coolant hoses from the throttle body.
13. Remove the throttle body mounting bolts (models with four-cylinder engine) or nuts (models with V6 engine) (Fig. 13.3) and remove the housing.
Fig. 13.13. To disconnect the throttle body from the intake manifold, unscrew the three nuts (the model shown is with a V6 engine, similar for models with a four-cylinder engine)
14. Remove the gasket from the throttle body and discard it (fig. 13.14).
Fig. 13.14. Remove the gasket from the throttle body and discard it (model with V6 engine shown)
15. Installation is performed in the reverse order of removal. Tighten the throttle body mounting nuts to the specified torque specified in Specifications at the beginning of this chapter. Check the coolant level, top up if necessary (see chapter 1).
Models 2004 and later
16. Disconnect the ground cable from the battery (see paragraph 1 of chapter 5).
17. Remove the suspension strut clamp (see chapter 10).
18. Remove the engine cover (see "Intake manifold - removal and installation" in chapter 2A or 2B).
19. Remove the air intake duct (see paragraph 9).
20. Clamp the coolant hoses going to the throttle body to minimize fluid leakage.
21. Disconnect the electrical connector on the throttle body and release the wiring harness from the clamp on the fuel line bracket (fig. 13.21).
Fig. 13.21. Disconnect the electrical connector (A), release the wiring harness from the clamp (B), release the fuel hose (C) from the clamp on the bracket and disconnect the coolant hoses (D) (the model with a four-cylinder engine is shown, similar for models with a V6 engine)
22. Release the fuel hose from the fuel line bracket, then attach identification tags to the hoses and disconnect the vacuum hoses and coolant hoses from the throttle body (fig. 13.21). Plug the hoses to prevent fluid from leaking.
23. Remove the throttle body mounting bolts (fig. 13.23) and remove the housing.
Fig. 13.23. To disconnect the throttle body from the exhaust manifold, unscrew the bolts (the model with a four-cylinder engine is shown, similar for models with a V6 engine)
24. Remove the gasket from the throttle body and discard it.
25. Installation is carried out in the reverse order of removal. Use a new gasket and tighten the throttle body mounting bolts to the specified torque specified in Specifications at the beginning of this chapter. Check the coolant level, top up if necessary (see chapter 1).