Toyota Prius: Engine Coolant Temperature Sensor

• Removal
• Inspection
• Installation

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	Link
Replacement of engine coolant temperature sensor Replacement of EGR valve assembly Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.
Replacement of ECM	Perform Toyota Prius Vehicle Identification Number (VIN) registration	DTC is output
	ECU configuration	-
	Update ECU security key	Toyota Prius Vehicle Control History (RoB) are stored
Replacement of inverter with converter assembly	ECU configuration	-
	Resolver learning	DTCs are stored Slight vibration at a Toyota Prius vehicle speed of 5 km/h (3 mph) or less Shock or vibration during acceleration

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

Items for which learning is completed by driving the Toyota Prius vehicle

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Front Camera System	Drive the Toyota Prius vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.

Items for which learning is completed by operating the vehicle normally

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
*1: w/o Power Back Door System *2: w/ Power Back Door System
Power Door Lock Control System*1 Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.
Power Back Door System*2	Reset back door close position
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	EGR VALVE ASSEMBLY	25620	-	-	-
2	ENGINE COOLANT TEMPERATURE SENSOR	89422		-	-

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Non-reusable part

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PROCEDURE

1. REMOVE EGR VALVE ASSEMBLY

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2. REMOVE ENGINE COOLANT TEMPERATURE SENSOR

(1) Disconnect the engine coolant temperature sensor connector.

(2) Using SST, remove the engine coolant temperature sensor from the water outlet.

SST: 09817-33191

NOTICE:

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

(3) Remove the gasket from the engine coolant temperature sensor.

Inspection

INSPECTION

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 Result 1 (E2) - 2 (THW) 20°C (68°F) 2.32 to 2.59 kΩ kΩ 1 (E2) - 2 (THW) 80°C (176°F) 0.310 to 0.326 kΩ 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)

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	ENGINE COOLANT TEMPERATURE SENSOR	89422		-	-
2	EGR VALVE ASSEMBLY	25620	-	-	-
3	PERFORM INITIALIZATION	-	-	-

N*m (kgf*cm, ft.*lbf): Specified torque

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Non-reusable part

PROCEDURE

1. INSTALL ENGINE COOLANT TEMPERATURE SENSOR

(1) Install a new gasket to the engine coolant temperature sensor.

(2) Using SST, install the engine coolant temperature sensor to the water outlet.

SST: 09817-33191

Torque:

19.6 N·m {200 kgf·cm, 14 ft·lbf}

NOTICE:

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

(3) Connect the engine coolant temperature sensor connector.

2. INSTALL EGR VALVE ASSEMBLY

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3. PERFORM INITIALIZATION

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

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