Toyota Prius: Ambient 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 thermistor assembly and lever set 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.
Front bumper assembly*	Front television camera view adjustment	Panoramic View Monitor System
		Advanced Park

CAUTION / NOTICE / HINT

COMPONENTS (REMOVAL)

Procedure		Part Name Code
1	RADIATOR SUPPORT OPENING COVER	53289A	-	-	-
2	THERMISTOR ASSEMBLY	88790B	-	-	-

*A	w/o Grille Shutter	*B	for M20A-FXS
*C	for 2ZR-FXE	-	-

Procedure		Part Name Code
3	FRONT BUMPER ASSEMBLY	-	-	-	-
4	FRONT RADIATOR SIDE AIR GUIDE PLATE LH	16695A	-	-	-
5	THERMISTOR ASSEMBLY	88790B	-	-	-

*A

w/ Grille Shutter

-

-

PROCEDURE

1. REMOVE RADIATOR SUPPORT OPENING COVER (w/o Grille Shutter)

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2. REMOVE THERMISTOR ASSEMBLY (w/o Grille Shutter)

3. REMOVE FRONT BUMPER ASSEMBLY (w/ Grille Shutter)

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4. REMOVE FRONT RADIATOR SIDE AIR GUIDE PLATE LH (w/ Grille Shutter)

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5. REMOVE THERMISTOR ASSEMBLY (w/ Grille Shutter)

Inspection

INSPECTION

PROCEDURE

1. INSPECT THERMISTOR ASSEMBLY (for M20A-FXS)

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(A28) Click Connector(A28) Tester Connection Condition Specified Condition Result A28-1 - A28-2 10°C (50°F) 3.00 to 3.73 kΩ kΩ A28-1 - A28-2 15°C (59°F) 2.45 to 2.88 kΩ kΩ A28-1 - A28-2 20°C (68°F) 1.95 to 2.30 kΩ kΩ A28-1 - A28-2 25°C (77°F) 1.60 to 1.80 kΩ kΩ A28-1 - A28-2 30°C (86°F) 1.28 to 1.47 kΩ kΩ A28-1 - A28-2 35°C (95°F) 1.00 to 1.22 kΩ kΩ A28-1 - A28-2 40°C (104°F) 0.80 to 1.00 kΩ kΩ A28-1 - A28-2 45°C (113°F) 0.65 to 0.85 kΩ kΩ A28-1 - A28-2 50°C (122°F) 0.50 to 0.70 kΩ kΩ A28-1 - A28-2 55°C (131°F) 0.44 to 0.60 kΩ kΩ A28-1 - A28-2 60°C (140°F) 0.36 to 0.50 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 result is not as specified, replace the thermistor assembly.

*a Component without harness connected (Thermistor Assembly) *b Sensing Portion *c Resistance (kΩ) *d Temperature (°C (°F)) *e Allowable Range

2. INSPECT THERMISTOR ASSEMBLY (for 2ZR-FXE)

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(A23) Click Connector(A23) Tester Connection Condition Specified Condition Result A23-1 - A23-2 10°C (50°F) 3.00 to 3.73 kΩ kΩ A23-1 - A23-2 15°C (59°F) 2.45 to 2.88 kΩ kΩ A23-1 - A23-2 20°C (68°F) 1.95 to 2.30 kΩ kΩ A23-1 - A23-2 25°C (77°F) 1.60 to 1.80 kΩ kΩ A23-1 - A23-2 30°C (86°F) 1.28 to 1.47 kΩ kΩ A23-1 - A23-2 35°C (95°F) 1.00 to 1.22 kΩ kΩ A23-1 - A23-2 40°C (104°F) 0.80 to 1.00 kΩ kΩ A23-1 - A23-2 45°C (113°F) 0.65 to 0.85 kΩ kΩ A23-1 - A23-2 50°C (122°F) 0.50 to 0.70 kΩ kΩ A23-1 - A23-2 55°C (131°F) 0.44 to 0.60 kΩ kΩ A23-1 - A23-2 60°C (140°F) 0.36 to 0.50 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 result is not as specified, replace the thermistor assembly.

*a Component without harness connected (Thermistor Assembly) *b Sensing Portion *c Resistance (kΩ) *d Temperature (°C (°F)) *e Allowable Range

Installation

INSTALLATION

CAUTION / NOTICE / HINT

COMPONENTS (INSTALLATION)

Procedure		Part Name Code
1	THERMISTOR ASSEMBLY	88790B	-	-	-
2	FRONT RADIATOR SIDE AIR GUIDE PLATE LH	16695A	-	-	-
3	FRONT BUMPER ASSEMBLY	-	-	-	-

*A

w/ Grille Shutter

-

-

Procedure		Part Name Code
4	THERMISTOR ASSEMBLY	88790B	-	-	-
5	RADIATOR SUPPORT OPENING COVER	53289A	-	-	-

*A	w/o Grille Shutter	*B	for M20A-FXS
*C	for 2ZR-FXE	-	-

PROCEDURE

1. INSTALL THERMISTOR ASSEMBLY (w/ Grille Shutter)

2. INSTALL FRONT RADIATOR SIDE AIR GUIDE PLATE LH (w/ Grille Shutter)

3. INSTALL FRONT BUMPER ASSEMBLY (w/ Grille Shutter)

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4. INSTALL THERMISTOR ASSEMBLY (w/o Grille Shutter)

5. INSTALL RADIATOR SUPPORT OPENING COVER (w/o Grille Shutter)