Toyota Avalon (XX50): Throttle Body

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Throttle Body

Components

COMPONENTS

ILLUSTRATION

*1	AIR CLEANER CAP WITH AIR CLEANER HOSE	*2	THROTTLE BODY GASKET
*3	THROTTLE BODY WITH MOTOR ASSEMBLY	*4	VACUUM HOSE
*5	NO. 1 FUEL VAPOR FEED HOSE	*6	NO. 2 VENTILATION HOSE
*7	NO. 2 WATER BY-PASS HOSE	*8	NO. 3 WATER BY-PASS HOSE
	Nm (kgfcm, ft.*lbf): Specified torque	●	Non-reusable part

Inspection

INSPECTION

PROCEDURE

1. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (M-) - 2 (M+)	20°C (68°F)	0.3 to 100 Ω

If the result is not as specified, replace the throttle body with motor assembly.

*a	Component without harness connected (Throttle Body with Motor Assembly)

Installation

INSTALLATION

PROCEDURE

1. INSTALL THROTTLE BODY GASKET

(a) Install a new throttle body gasket to the intake air surge tank assembly with the protrusion of the throttle body gasket oriented as shown in the illustration.

*a	Protrusion

2. INSTALL THROTTLE BODY WITH MOTOR ASSEMBLY

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Click here

(a) Install the throttle body with motor assembly to the intake air surge tank assembly with the 4 bolts.

Torque:

10 N·m {102 kgf·cm, 7 ft·lbf}

NOTICE:

If the throttle body with motor assembly has been struck or dropped, replace it.

(b) Connect the throttle body with motor assembly connector.

(c) Connect the No. 2 water by-pass hose and No. 3 water by-pass hose to the throttle body with motor assembly and slide the 2 clips to secure them.

NOTICE:

Make sure to position each clip as shown in the illustration.

*1	No. 2 Water By-pass Hose
*2	No. 3 Water By-pass Hose
*a	Top
*b	Left Side of Vehicle
*c	Front of Vehicle
*d	Paint Mark
*e	90° (Claw of Clip Location)

3. INSTALL AIR CLEANER CAP WITH AIR CLEANER HOSE

(a) Install the air cleaner cap with air cleaner hose to the throttle body with motor assembly.

NOTICE:

Align the cutout of the air cleaner hose assembly with the protrusion of the throttle body with motor assembly.

*a	Protrusion
*b	Cutout
*c	Hose Clamp End
*d	2.0 mm (0.0787 in.)
*e	Paint Mark

(b) Tighten the hose clamp in the position shown in the illustration.

NOTICE:

Make sure that the end of the hose clamp is positioned as shown in the illustration.

(d) Engage the 2 air cleaner cap clamps to install the air cleaner cap sub-assembly to the air cleaner case sub-assembly.

(e) Connect the No. 2 ventilation hose to the air cleaner hose and slide the clip to secure it.

NOTICE:

Make sure to position the clip as shown in the illustration.

*1	No. 1 Fuel Vapor Feed Hose
*2	No. 2 Ventilation Hose
*a	Top
*b	Paint Mark
*c	Rear of Vehicle
*d	180° (Claw of Clip Location)

(f) Engage the 2 clamps to connect the No. 1 fuel vapor feed hose to the air cleaner hose.

(g) Connect the vacuum hose to the air cleaner hose.

(h) Engage the 2 wire harness clamps.

(i) Connect the mass air flow meter sub-assembly connector.

4. ADD ENGINE COOLANT

Click here

5. INSPECT FOR COOLANT LEAK

Click here

6. PERFORM INITIALIZATION

NOTICE:

Be sure to perform this procedure after removing and reinstalling the throttle body with motor assembly or any throttle body with motor assembly components.
Perform the following procedure after replacing the throttle body with motor assembly or any throttle body with motor assembly components. The following procedure should also be performed if the throttle body with motor assembly is cleaned.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Perform "Inspection After Repair".

Click here

(f) Start the engine and check that the MIL is not illuminated. After the engine is warmed up, check that the idle speed is within the specified range with the A/C switch off.

Standard Idle Speed:

600 to 700 rpm

NOTICE:

Be sure to perform this step with all accessories off.
Make sure that the shift lever is in P or N.

(g) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage %.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage %

(h) Fully depress the accelerator pedal and check that the value is 60% or higher.

(i) Perform a road test and confirm that there are no abnormalities.

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY

(a) Check the idle speed.

(1) Start the engine and check that the MIL is not illuminated. After the engine is warmed up, check that the idle speed is within the specified range with the A/C switch off.

Standard Idle Speed:

600 to 700 rpm

NOTICE:

Be sure to perform this step with all accessories off.
Make sure that the shift lever is in P or N.

(2) Perform a road test and confirm that there are no abnormalities.

(b) Inspect the throttle position sensor.

(1) Connect the Techstream to the DLC3.

(2) Start the engine.

(3) Turn the Techstream on.

(4) Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage %.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No.1 Voltage %

(5) Fully depress the accelerator pedal and check that the value is 60% or higher.

If the percentage is less than 60%, check the throttle body with motor assembly, wire harness and ECM.

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during throttle body with motor assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Replacement of throttle body with motor assembly Cleaning the deposits from the throttle body with motor assembly	Inspection after repair	Poor idle, etc. Engine start function, etc.

PROCEDURE

1. DRAIN ENGINE COOLANT

Click here

2. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disengage the 2 wire harness clamps.

(d) Disengage the 2 clamps to disconnect the No. 1 fuel vapor feed hose from the air cleaner hose.

*1	No. 1 Fuel Vapor Feed Hose
*2	No. 2 Ventilation Hose

(e) Slide the clip and disconnect the No. 2 ventilation hose from the air cleaner hose.

(f) Disengage the 2 air cleaner cap clamps.

*a	Air Cleaner Cap Clamp
*b	Guide

(g) Disengage the 2 guides to separate the air cleaner cap sub-assembly from the air cleaner case sub-assembly.

(h) Loosen the hose clamp and remove the air cleaner cap with air cleaner hose from the throttle body with motor assembly.

3. REMOVE THROTTLE BODY WITH MOTOR ASSEMBLY

(a) Slide the 2 clips and disconnect the No. 2 water by-pass hose and No. 3 water by-pass hose from the throttle body with motor assembly.

*1	No. 2 Water By-pass Hose
*2	No. 3 Water By-pass Hose

(b) Disconnect the throttle body with motor assembly connector.

NOTICE:

If the throttle body with motor assembly has been struck or dropped, replace it.

4. REMOVE THROTTLE BODY GASKET

(a) Remove the throttle body gasket from the intake air surge tank assembly.

Vehicle Control History

Vacuum Switching Valve(for Engine Mounting)

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