Toyota Prius: Front Evaporator Temperature Sensor

Toyota Prius (XW60) 2023-2025 Service Manual / Vehicle Interior / Heating / Air Conditioning / Front Evaporator 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 No. 1 cooler thermistor removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedures	Effect/Inoperative Function When Necessary Procedures are not Performed	Link
*: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.
w/ Occupant Classification System: Front passenger seat*	Zero point calibration (Occupant classification system)	Occupant Classification System Passenger airbag ON/OFF indicator Airbag System (Front passenger side) Seat Belt Warning System (Front passenger)

CAUTION / NOTICE / HINT

CAUTION:

Be sure to read Precaution thoroughly before servicing.

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NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

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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.

Learning completes when Toyota Prius vehicle is driven

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

Learning completes when vehicle is operated normally

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	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	for HEV Model: After the ignition switch is turned to ON, the servo motor standard position is recognized. for PHEV Model: After the ignition switch is turned to ON, the servo motor and expansion valve standard position is recognized.	-

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	BLOWER ASSEMBLY	87130D	-	-	-
2	NO. 3 HEATER TO REGISTER DUCT SUB-ASSEMBLY	55086	-	-	-
3	LOWER DEFROSTER NOZZLE ASSEMBLY	55990B	-	-	-
4	LOWER DEFROSTER NOZZLE	55967B	-	-	-
5	AIR CONDITIONING HARNESS ASSEMBLY	82210K	-	-	-

Procedure		Part Name Code
6	NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY	87050C	-	-	-
7	HEATER PIPE GROMMET	88897M	-	-	-
8	HEATER CLAMP	87124C	-	-	-
9	HEATER RADIATOR UNIT SUB-ASSEMBLY	87107A		-	-

Procedure		Part Name Code
10	COOLER PIPE GROMMET	88897K	-	-	-
11	COOLER EXPANSION VALVE	88515		-	-
12	CONNECTOR TUBE	-		-	-
13	COOLING UNIT PARTS	88899L	-	-	-
14	NO. 1 DISCHARGE TUBE	88715M		-	-
15	CONDENSER ASSEMBLY	88460Q	-	-	-
16	NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY	88501		-	-
17	NO. 1 COOLER THERMISTOR	88625	-	-	-

*A	for HEV Model	*B	for PHEV Model
*1	UPPER HEATER CASE	*2	LOWER HEATER CASE
●	Non-reusable part	-	-

PROCEDURE

1. REMOVE BLOWER ASSEMBLY

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2. REMOVE NO. 3 HEATER TO REGISTER DUCT SUB-ASSEMBLY

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3. REMOVE LOWER DEFROSTER NOZZLE ASSEMBLY

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4. REMOVE LOWER DEFROSTER NOZZLE

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5. REMOVE AIR CONDITIONING HARNESS ASSEMBLY

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6. REMOVE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

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7. REMOVE HEATER PIPE GROMMET

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8. REMOVE HEATER CLAMP

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9. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY

Click here

10. REMOVE COOLER PIPE GROMMET

Click here

11. REMOVE COOLER EXPANSION VALVE (for HEV Model)

Click here

12. REMOVE CONNECTOR TUBE (for PHEV Model)

Click here

13. REMOVE COOLING UNIT PARTS (for PHEV Model)

Click here

14. REMOVE NO. 1 DISCHARGE TUBE (for PHEV Model)

Click here

15. REMOVE CONDENSER ASSEMBLY (for PHEV Model)

Click here

16. REMOVE NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

Click here

17. REMOVE NO. 1 COOLER THERMISTOR

Inspection

INSPECTION

PROCEDURE

1. INSPECT NO. 1 COOLER THERMISTOR

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

Component without harness connected

(No. 1 Cooler Thermistor)

Sensing Portion

Resistance (kΩ)

Temperature (°C (°F))

Allowable Range

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
A-1 - A-2	-10°C (14°F)	7.30 to 9.10 kΩ	kΩ
A-1 - A-2	-5°C (23°F)	5.65 to 6.95 kΩ	kΩ
A-1 - A-2	0°C (32°F)	4.40 to 5.35 kΩ	kΩ
A-1 - A-2	5°C (41°F)	3.40 to 4.15 kΩ	kΩ
A-1 - A-2	10°C (50°F)	2.70 to 3.25 kΩ	kΩ
A-1 - A-2	15°C (59°F)	2.14 to 2.58 kΩ	kΩ
A-1 - A-2	20°C (68°F)	1.71 to 2.05 kΩ	kΩ
A-1 - A-2	25°C (77°F)	1.38 to 1.64 kΩ	kΩ
A-1 - A-2	30°C (86°F)	1.11 to 1.32 kΩ	kΩ

NOTICE:

Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
When measuring, the sensor temperature must be the same as the ambient temperature.

HINT:

As the temperature increases, the resistance decreases (see the graph).

If the resistance is not as specified, replace the No. 1 cooler thermistor.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	NO. 1 COOLER THERMISTOR	88625		-	-
2	NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY	88501		-	-
3	CONDENSER ASSEMBLY	88460Q	-	-	-
4	NO. 1 DISCHARGE TUBE	88715M		-	-
5	COOLING UNIT PARTS	88899L		-	-
6	CONNECTOR TUBE	-		-	-
7	COOLER EXPANSION VALVE	88515		-	-
8	COOLER PIPE GROMMET	88897K	-	-	-

*A	for HEV Model	*B	for PHEV Model
*1	UPPER HEATER CASE	*2	LOWER HEATER CASE
	Nm (kgfcm, ft.*lbf): Specified torque	●	Non-reusable part
	Compressor oil ND-OIL 11 or equivalent	-	-

Procedure		Part Name Code
9	HEATER RADIATOR UNIT SUB-ASSEMBLY	87107A	-	-	-
10	HEATER CLAMP	87124C	-	-	-
11	HEATER PIPE GROMMET	88897M		-	-
12	NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY	87050C		-	-

Procedure		Part Name Code
13	AIR CONDITIONING HARNESS ASSEMBLY	82210K	-	-	-
14	LOWER DEFROSTER NOZZLE	55967B	-	-	-
15	LOWER DEFROSTER NOZZLE ASSEMBLY	55990B	-	-	-
16	NO. 3 HEATER TO REGISTER DUCT SUB-ASSEMBLY	55086	-	-	-
17	BLOWER ASSEMBLY	87130D	-	-	-

PROCEDURE

1. INSTALL NO. 1 COOLER THERMISTOR

Securing Part

Sensor Part

(1) Install the No. 1 cooler thermistor as shown in the illustration.

Installation Position:

Part	Length	Part	Length
A	45 to 55 mm (1.77 to 2.17 in.)	B	61.1 mm (2.41 in.)

NOTICE:

Be sure to insert the No. 1 cooler thermistor only once because reinserting it into the same position will not allow it to be firmly secured.
When reusing the No. 1 cooler evaporator sub-assembly, insert the No. 1 cooler thermistor one row next to the one that has been used previously (X in the illustration).
After inserting the No. 1 cooler thermistor, do not apply excessive force to the wire.
Directly insert the No. 1 cooler thermistor until the edge of the plastic case "a" comes into contact with the No. 1 cooler evaporator sub-assembly "b".

2. INSTALL NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY