Toyota Avalon (XX50): Engine Coolant Temperature Sensor

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / A25a-fxs Engine Control / Engine Coolant Temperature Sensor

Components

COMPONENTS

ILLUSTRATION

*1	COOL AIR INTAKE DUCT SEAL	*2	ENGINE COOLANT TEMPERATURE SENSOR
*3	INLET AIR CLEANER ASSEMBLY	*4	NO. 2 ENGINE COOLANT TEMPERATURE SENSOR
	Nm (kgfcm, ft.*lbf): Specified torque	●	Non-reusable part

Inspection

INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Do not put your hands into the water that has been heated for the inspection.
Touching the heated water could result in burns.

PROCEDURE

1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	2.32 to 2.59 kΩ
1 - 2	80°C (176°F)	0.310 to 0.326 kΩ

NOTICE:

If checking the engine coolant temperature sensor in water, be careful not to allow water to contact the terminals. After checking, wipe the water off the engine coolant temperature sensor.

If the result is not as specified, replace the engine coolant temperature sensor.

*a	Component without harness connected (Engine Coolant Temperature Sensor)

2. INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	2.32 to 2.59 kΩ
1 - 2	80°C (176°F)	0.310 to 0.326 kΩ

NOTICE:

If checking the No. 2 engine coolant temperature sensor in water, be careful not to allow water to contact the terminals. After checking, wipe the water off the No. 2 engine coolant temperature sensor.

If the result is not as specified, replace the No. 2 engine coolant temperature sensor.

*a	Component without harness connected (No. 2 Engine Coolant Temperature Sensor)

Installation

INSTALLATION

PROCEDURE

1. INSTALL ENGINE COOLANT TEMPERATURE SENSOR

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here

(a) Apply a light coat of engine coolant to the O-ring of the engine coolant temperature sensor.

(b) Install the engine coolant temperature sensor to the water outlet with a new clip.

NOTICE:

If the engine coolant temperature sensor has been struck or dropped, replace it.
If reusing the engine coolant temperature sensor, be sure to inspect the O-ring.
Make sure that the O-ring is not cracked or moved out of place when installing the engine coolant temperature sensor.

2. INSTALL CONVERTER WITH INVERTER ASSEMBLY

Click here

3. INSTALL NO. 2 ENGINE COOLANT TEMPERATURE SENSOR

(a) Apply a light coat of engine coolant to the O-ring of the No. 2 engine coolant temperature sensor.

(b) Install the No. 2 engine coolant temperature sensor to the radiator pipe with a new clip.

NOTICE:

If the No. 2 engine coolant temperature sensor has been struck or dropped, replace it.
If reusing the No. 2 engine coolant temperature sensor, be sure to inspect the O-ring.
Make sure that the O-ring is not cracked or moved out of place when installing the No. 2 engine coolant temperature sensor.

4. INSTALL INLET AIR CLEANER ASSEMBLY

Click here

5. INSTALL COOL AIR INTAKE DUCT SEAL

Click here

6. ADD ENGINE COOLANT (for Engine)

Click here

7. INSPECT FOR COOLANT LEAK (for Engine)

Click here

8. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing the engine coolant temperature 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 engine coolant temperature 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
*: When performing learning using the Techstream. Click here
Auxiliary battery terminal is disconnected/reconnected	Perform steering sensor zero point calibration	Lane Departure Alert System (w/ Steering Control)
		Pre-collision System
		Intelligent Clearance Sonar System*
		Lighting System (for HV Model with Cornering Light)
	Memorize steering angle neutral point	Parking Assist Monitor System
	Memorize steering angle neutral point	Panoramic View Monitor System
Replacement of inverter with converter assembly	Resolver learning	DTCs are stored Slight vibration at a vehicle speed of 5 km/h (3 mph) or less Shock or vibration during acceleration
Replacement of ECM	Perform Vehicle Identification Number (VIN) registration	MIL illuminates
Replacement of engine coolant temperature sensor	Inspection after repair	Poor idle, etc. Engine start function, etc.

PROCEDURE

1. DRAIN ENGINE COOLANT (for Engine)

Click here

2. REMOVE COOL AIR INTAKE DUCT SEAL

Click here

3. REMOVE INLET AIR CLEANER ASSEMBLY

Click here

4. REMOVE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR

(a) Disconnect the No. 2 engine coolant temperature sensor connector.

(b) Remove the clip and No. 2 engine coolant temperature sensor from the radiator pipe.

NOTICE:

If the No. 2 engine coolant temperature sensor has been struck or dropped, replace it.

5. REMOVE CONVERTER WITH INVERTER ASSEMBLY

Click here

6. REMOVE ENGINE COOLANT TEMPERATURE SENSOR

(a) Disconnect the engine coolant temperature sensor connector.

(b) Remove the clip and engine coolant temperature sensor from the water outlet.

NOTICE:

If the engine coolant temperature sensor has been struck or dropped, replace it.

Ecm

Engine Oil Temperature Sensor

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