Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Throttle Body

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REMOVAL & INSTALLATION



1FZ-FE Engine


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Fig. Exploded view of the throttle body and related components1997 Land Cruiser with 1FZ-FE engine

  1. Relieve the fuel system pressure.
  2.  
  3. Drain the engine cooling system.
  4.  
  5. Disconnect the PCV and air cleaner hoses.
  6.  
  7. Remove the control cables from the throttle body.
  8.  
  9. Disconnect the Throttle Position (TP) sensor and Idle Air Control (IAC) valve wiring.
  10.  
  11. Tag and disconnect all vacuum and water hoses leading to the throttle body.
  12.  
  13. Remove the bolts and disconnect the throttle body from the air intake chamber (upper intake manifold).
  14.  
  15. Remove the throttle body gasket and discard.
  16.  
  17. Disconnect the both of the water bypass hoses from the throttle body, then remove the unit.
  18.  

To install:

  1. Using soft brush and carburetor cleaner, clean the cast aluminum parts. Using compressed air, clean all passages and opening.
  2.  


WARNING
To prevent damaging the parts, do NOT clean the TP sensor, dashpot or IAC Valve.

  1. Apply vacuum to the throttle opener. Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.
  2.  
  3. Attach the water bypass hoses to the throttle body.
  4.  
  5. Install the throttle body with a new gasket, and then tighten to 15 ft. lbs. (21 Nm).
  6.  
  7. Install all previously tagged vacuum and water hoses.
  8.  
  9. Attach the Throttle Position (TP) sensor and Idle Air Control (IAC) wiring.
  10.  
  11. Install the control cables to the throttle body.
  12.  
  13. Connect the PCV and air cleaner hoses.
  14.  
  15. Fill the cooling system. Start the engine to check for coolant and vacuum leaks. Add coolant, as required.
  16.  

2RZ-FE and 3RZ-FE Engines


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Fig. Throttle body arrangement and related components2RZ-FE and 3RZ-FE engines

  1. Drain the engine coolant.
  2.  
  3. If equipped with a manual transmission, disconnect the accelerator cable from the throttle body.
  4.  
  5. If equipped with an automatic transmission, disconnect the accelerator cable and the throttle cables from the throttle body.
  6.  
  7. Remove the air cleaner hose with the resonator.
  8.  
  9. Tag for identification, then disconnect the air hose from the Idle Air Control (IAC) valve, the vacuum line from the fuel pressure regulator, and the clamp for the engine wiring harness. Remove the two bolts, the hose clamp and remove the intake air intake connector.
  10.  
  11. Disconnect the PCV hose.
  12.  
  13. Tag for identification then disconnect the three vacuum hoses, EVAP hose and, if equipped with power steering, the hose for the power steering idle-up.
  14.  
  15. Detach the Throttle Position (TP) sensor and IAC valve connectors.
  16.  
  17. Remove the two bolts and two nuts and remove the throttle body from the air intake. Discard the gasket.
  18.  

To install:

  1. Using soft brush and carburetor cleaner, clean the cast aluminum parts. Using compressed air, clean all passages and opening.
  2.  


WARNING
To prevent damaging the parts, do NOT clean the TP sensor or IAC Valve.

  1. Apply vacuum to the throttle opener. Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.
  2.  
  3. Installation is the reverse of the removal procedure. Use a new gasket on the throttle body. Tighten the nuts and bolts to 14 ft. lbs. (20 Nm).
  4.  
  5. Attach the TP sensor and IAC valve wiring.
  6.  
  7. Install the control cables to the throttle body.
  8.  
  9. Install the hoses, noting the identification tags made at removal.
  10.  
  11. Connect the PCV and air cleaner hoses.
  12.  
  13. Fill the cooling system. Start the engine to check for coolant and vacuum leaks. Add coolant, as required.
  14.  

5VZ-FE Engine


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Fig. View of the throttle plate in the throttle body



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Fig. You can use a commercially available spray to clean the throttle body



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Fig. Disconnect the throttle cable from the side of the throttle body



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Fig. Slide the throttle body straight off the alignment studs



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Fig. Always use a new gasket when re-installing the throttle body



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Fig. To install, align the throttle body with the studs



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Fig. Throttle body arrangement and related components5VZ-FE engine



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Fig. Throttle body fastener locations. Note the gasket tab (protrusion) which must face upward5VZ-FE engine

  1. Drain the cooling system.
  2.  
  3. If equipped with cruise control, disconnect the cruise control actuator cable and accelerator cable from the throttle body. If equipped with automatic transmission, disconnect the throttle valve cable from the throttle body.
  4.  
  5. Remove the air cleaner hose.
  6.  
  7. Detach the Throttle Position (TP) sensor connector and Idle Air Control (IAC) valve connectors.
  8.  
  9. Tag and disconnect the water and vacuum hoses from the throttle body.
  10.  
  11. On some vehicles, it may be necessary to disconnect the ignition coil wiring.
  12.  
  13. Unbolt the throttle body and remove and discard the gasket.
  14.  

To install:

  1. Using soft brush and carburetor cleaner, clean the cast aluminum parts. Using compressed air, clean all passages and opening.
  2.  


WARNING
To prevent damaging the parts, do NOT clean the TP sensor or IAC valve.

  1. Installation is the reverse of the removal procedure. Place a new gasket on the air intake chamber facing the tab (protrusion) upwards. Position the throttle body and tighten the fasteners evenly to 13 ft. lbs. (18 Nm).
  2.  
  3. Attach the TP sensor and IAC valve wiring.
  4.  
  5. Install the control cables to the throttle body.
  6.  
  7. Attach the hoses, noting the identification tags made at removal.
  8.  
  9. Connect the PCV and air cleaner hoses.
  10.  
  11. Fill the cooling system. Start the engine to check for coolant and vacuum leaks. Add coolant, as required.
  12.  

2UZ-FE Engine

The throttle body arrangement on Toyota's 2UZ-FE engine is somewhat unique: although it has a throttle cable, the cable is primarily a back-up. The throttle is electrically controlled. The Throttle Position (TP) sensor is mounted on the throttle body and detects the throttle opening angle. The voltage applied to terminals VTA and VTA2 of the ECM changes between 0 volt and 5 volts, in proportion to the opening angle of the throttle valve.

The ECM calculates the current opening angle of the throttle valve from these signal inputs to the ECM and the ECM controls the throttle motor which as a clutch and gear set to control the throttle plate angle to properly position the throttle valve angle in response to the driver's demand.

In the event of a component failure, a DTC is set and the ECM shuts down the power for the throttle motor and the electromagnetic clutch, and the throttle valve is closed by the return spring. The throttle valve can still be controlled by the accelerator pedal through the throttle cable.

This system should be handled carefully. Use care NOT to shock or damage the system in any way. Use care when handling the electrical connectors.



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Fig. Throttle body and related components2UZ-FE engine

  1. Remove the acoustic/cosmetic throttle body cover.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Remove the intake air connector.
  6.  
  7. Disconnect the accelerator cable from the throttle body.
  8.  
  9. Detach the Throttle Position (TP) sensor electrical connector.
  10.  
  11. Detach the throttle control motor electrical connector.
  12.  
  13. Disconnect the accelerator pedal position electrical sensor
  14.  
  15. Disconnect the accelerator pedal position sensor wire from the two clamps on the wire bracket.
  16.  
  17. Disconnect the PCV hose and water bypass hose from the throttle body.
  18.  
  19. Remove the ventilation cap.
  20.  
  21. Remove the two bolts and two nuts and remove the throttle body from the intake manifold. Disconnect the water bypass hose from the thermostat on the throttle body and remove the throttle body from the vehicle. Discard the gasket.
  22.  

To install:

  1. Installation is the reverse of the installation procedure. Connect the water bypass hose to the manifold thermostat on the throttle body.
  2.  
  3. Position the throttle body to the intake manifold, using a new gasket. Tighten the two nuts and bolts evenly to 13 ft. lbs. (18 Nm). Install the ventilation cap.
  4.  
  5. Connect the water bypass hose and PCV hose to the throttle body
  6.  
  7. Attach the TP sensor and throttle control motor connectors.
  8.  
  9. Connect the accelerator pedal sensor connector and secure the wire to the clamps on the wire brackets.
  10.  
  11. Connect the accelerator cable to the throttle body and install the air intake connector.
  12.  
  13. Refill the engine with coolant. Start the engine and check for coolant leaks. Install the throttle body cover.
  14.  

 
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