Toyota Avalon (XX50): Air Fuel Ratio Sensor(for Sensor 1)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Air Fuel Ratio Sensor(for Sensor 1)

Components

COMPONENTS

ILLUSTRATION

*1	AIR FUEL RATIO SENSOR	*2	NO. 1 ENGINE COVER SUB-ASSEMBLY
	Nm (kgfcm, ft.*lbf): Specified torque	*	For use with SST

Inspection

INSPECTION

PROCEDURE

1. INSPECT AIR FUEL RATIO SENSOR

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (HA1A) - 2 (+B)	20°C (68°F)	1.6 to 3.2 Ω
1 (HA1A) - 4 (A1A-)	Always	10 kΩ or higher

If the result is not as specified, replace the air fuel ratio sensor.

*a	Component without harness connected (Air Fuel Ratio Sensor)

Installation

INSTALLATION

PROCEDURE

1. INSTALL AIR FUEL RATIO SENSOR

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

(a) Using SST, install the air fuel ratio sensor to the exhaust manifold (TWC: Front Catalyst).

SST: 09224-00012

Torque:

Specified tightening torque :

44 N·m {449 kgf·cm, 32 ft·lbf}

NOTICE:

If the air fuel ratio sensor has been struck or dropped, replace it.

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.
Click here
When using SST (fulcrum length of 30 mm (1.18 in.)) + torque wrench (fulcrum length of 180 mm (7.09 in.)):
37.7 N*m (384 kgf*cm, 28 ft.*lbf)

*a	Torque Wrench Fulcrum Length

(b) Connect the air fuel ratio sensor connector.

*a	Tie Band
*b	Wire Harness Clamp

2. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY

Click here

3. INSPECT FOR EXHAUST GAS LEAK

Click here

4. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here

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 air fuel ratio sensor 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 air fuel ratio sensor (sensor 1) Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.

PROCEDURE

1. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY

Click here

2. REMOVE AIR FUEL RATIO SENSOR

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Disengage the 3 wire harness clamps.

(b) Disconnect the air fuel ratio sensor connector.

SST: 09224-00012

NOTICE:

If the air fuel ratio sensor has been struck or dropped, replace it.

Water Pump

Air Fuel Ratio Sensor(for Sensor 2)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > A25a-fxs (emission Control): Purge Valve
ComponentsCOMPONENTS ILLUSTRATION *1 PURGE VALVE (PURGE VSV) *2 NO. 1 FUEL VAPOR FEED HOSE *3 NO. 2 FUEL VAPOR FEED HOSE - - N*m (kgf*cm, ft.*lbf): Specified torque - - InspectionINSPECTION PROCEDURE 1. INSPECT PURGE VALVE (PURGE VSV) (a) Measure the resistance according to the value(s) in the tabl ...