How to Troubleshoot and Repair Issues with the Coolant Temperature Gauge and Coolant Temperature Sensor on 1997 through 2001 Toyota Avalon?

To troubleshoot the coolant temperature gauge, check the fuses. If the gauge is not working, disconnect the wire at the Coolant Temperature Sensor and observe the gauge's behavior and if the reading drops, replace the sending unit. If the reading remains high, there may be a short in the wire. If the gauge fails to show any indication once the engine warms up, disconnect the wire at the sending unit and use a jumper wire to connect it to clean ground on the engine. Then, if the gauge still doesn't respond, there may be an open circuit. In order to remove the sending unit, drain the coolant, disconnect the wiring connector, and remove the unit using a wrench. Once you are installing the new unit, tighten it securely without using thread sealer. Finally, connect the wiring connector, refill the cooling system, and check for any coolant leakage or issues with the gauge's function.

How to replace the Coolant Temperature Sensor on a 2003-2009 Toyota 4Runner?

Drain the engine coolant until the level is below the sensor. For V6 models, the ECT sensor is located at the back of the engine on the rear coolant crossover between the two cylinder heads. Remove the engine cover and disconnect the electrical connector from the ECT sensor. Unscrew the ECT sensor from the coolant crossover using a deep socket. Before installing the new ECT sensor, wrap the threads with Teflon tape to prevent coolant leakage. Installation is the reverse of removal, ensuring the ECT sensor is tightened to the specified torque. Refill the cooling system. For V8 models, the ECT sensor is located on the front coolant crossover directly under the throttle body. Remove the throttle body cover and the air intake duct, then disconnect the electrical connector from the ECT sensor. Unscrew and remove the ECT sensor from the front coolant crossover with a deep socket. Again, wrap the threads of the new ECT sensor with Teflon tape before installation, which follows the reverse of removal, ensuring proper torque. Finally, refill the cooling system.

What is the Function and Importance of the Coolant Temperature Sensor on Toyota Sienna?

The engine coolant temperature (ECT) sensor is a thermistor that varies its resistance based on temperature changes, affecting the voltage signal sent to the PCM. As the sensor temperature decreases, resistance values increase, and as the temperature increases, resistance values decrease. Any issues in the ECT sensor circuits will trigger a diagnostic trouble code. Ensure the ignition key is in the OFF position and drain about 1 gallon of engine coolant, making sure the engine is completely cool before doing so. For 2007 and later models, remove the engine top cover by pulling up at the front edge and lifting the rear, then remove both air filter housing inlet ducts and the air filter housing assembly. For all models, wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion. Disconnect the electrical connector and carefully unscrew the sensor, which is located at the right end of the engine, below the cooling system pressure cap. Installation is the reverse of removal, taking care to handle the coolant sensor gently, as damage to it will impact the entire fuel injection system. Finally, refill the cooling system.

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Coolant Water Temperature Sensor

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94 Coolant Temperature Sensors found

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Toyota Sensor, Water Temperature
Part Number: 89422-35010
$63.12 MSRP: $88.98
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.)
- Comment: (FOR E.F.I.)
Fits the following Toyota Models:
- 4Runner | 1990-2002 | DLX, LULI, SR5, SR5B, SR5V, STD | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.4L
- Avalon | 1995-2004 | XL, XLS | 6 Cyl 3.0L
- Camry | 1993-2006 | CE, DX, LE, SE, XLE | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Celica | 1991-2005 | GT, GTS, ST, Turbo 4WD, Turbo All Trac | 4 Cyl 1.6L, 4 Cyl 1.8L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Corolla | 2003-2008, 1993-1997 | CE, DX, LE, S, STD, XR, XRS | 4 Cyl 1.6L, 4 Cyl 1.8L
- Highlander | 2001-2011 | Grande, Limited, Sport, STD | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L
- Land Cruiser | 1992-1997 | 6 Cyl 4.0L, 6 Cyl 4.5L
- MR2 Spyder | 2000-2005 | 4 Cyl 1.8L
- Matrix | 2003-2008 | CE, LE, S, STD, XR, XRS | 4 Cyl 1.8L
- Pickup | 1990-1995 | DLX, SR5, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
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Toyota Sensor, Water Temperature
Part Number: 89422-33030
$63.12 MSRP: $88.98
You Save: $25.86 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.); Coolant Temperature Sensor, Temperature Sensor
- Comment: (FOR E.F.I.)
Fits the following Toyota Models:
- 4Runner | 2003-2024 | Limited, SR5 | 4 Cyl 2.7L, 6 Cyl 4.0L, 8 Cyl 4.7L
- Avalon | 2005-2018 | Limited, XL, XLE, XLE Premium, XLE Touring Or Touring, XLS | 4 Cyl 2.5L, 6 Cyl 3.5L
- C-HR | 2017-2022 | 4 Cyl 2.0L
- Camry | 2002-2017 | LE, N, SE, XLE, XSE | 4 Cyl 2.4L, 4 Cyl 2.5L, 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L
- Corolla | 2009-2024 | CE, ECO, ECOSW, LE, S, STD, XRS | 4 Cyl 1.8L, 4 Cyl 2.0L, 4 Cyl 2.4L
- Corolla iM | 2017-2018 | N | 4 Cyl 1.8L
- Crown | 2023-2025 | 4 Cyl 2.4L, 4 Cyl 2.5L
- FJ Cruiser | 2007-2014 | 6 Cyl 4.0L
- Grand Highlander | 2024-2025 | 4 Cyl 2.4L, 4 Cyl 2.5L
- Highlander | 2022-2024, 2003-2019 | Grande, Limited, Medium, STD, Sport | 4 Cyl 2.4L, 4 Cyl 2.5L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L
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Toyota Sensor, Water Temperature
Part Number: 89422-20010
$63.12 MSRP: $88.98
You Save: $25.86 (30%)
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.)
- Manufacturer Note: ENGINE BLOCK
- Comment: (FOR E.F.I.)
Fits the following Toyota Models:
- 4Runner | 1988-1995 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Camry | 1989-2001 | CE, DX, LE, SE, STD, XLE | 4 Cyl 2.0L, 4 Cyl 2.2L, 6 Cyl 2.5L, 6 Cyl 3.0L
- Celica | 1988-1993 | GT, GTS, ST, Turbo 4WD, Turbo All Trac | 4 Cyl 1.6L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Corolla | 1988-1993 | DX, GTS, LE, SR5, STD | 4 Cyl 1.6L
- Cressida | 1989-1992 | GLX | 6 Cyl 3.0L
- Land Cruiser | 1998-2001, 1988-1993 | 6 Cyl 4.0L, 6 Cyl 4.5L, 8 Cyl 4.7L
- MR2 | 1988-1995 | GT, Super Charger | 4 Cyl 1.6L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Paseo | 1992-1998 | 4 Cyl 1.5L
- Pickup | 1988-1995 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Previa | 1991-1997 | DX, LE | 4 Cyl 2.4L
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Toyota Switch, Water Temperature
Part Number: 89428-28030
$126.69 MSRP: $180.11
You Save: $53.42 (30%)
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Product Specifications
- Other Name: Switch, Water Temperature (For E.F.I); Coolant Temperature Sensor
- Comment: (FOR E.F.I)
Fits the following Toyota Models:
- 4Runner | 1984-1988 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Corolla | 1987-1988 | D, GTS, Q | 4 Cyl 1.6L
- MR2 | 1985-1988 | GT, Super Charger | 4 Cyl 1.6L
- Pickup | 1984-1988 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Van | 1984-1989 | DLX, LE, STD | 4 Cyl 2.0L, 4 Cyl 2.2L
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Toyota Sensor, Water Temperature
Part Number: 89422-16010
$63.12 MSRP: $88.98
You Save: $25.86 (30%)
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.)
- Comment: (FOR E.F.I.)
Fits the following Toyota Models:
- Camry | 2002-2003 | LE, SE, XLE | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Corolla | 1998-2002 | CE, LE, S, VE | 4 Cyl 1.8L
- Echo | 2000-2005 | 4 Cyl 1.5L
- Paseo | 1997-1999 | 4 Cyl 1.5L
- Solara | 2001-2003 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
- Tercel | 1997-1999 | DX, STD | 4 Cyl 1.5L
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Toyota Sensor, Water Temperature
Part Number: 89422-30030
$69.73 MSRP: $98.29
You Save: $28.56 (30%)
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.); Coolant Temperature Sensor, Temperature Sensor
- Comment: (FOR E.F.I.)
Fits the following Toyota Models:
- 4Runner | 2003-2005 | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L
- Land Cruiser | 2000-2006 | 8 Cyl 4.7L
- Sequoia | 2001-2005 | Limited, SR5 | 8 Cyl 4.7L
- Tundra | 2002-2005 | DLX, Limited, SR5 | 6 Cyl 3.4L, 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Switch, Temperature Detect
Part Number: 89428-33010
$137.76 MSRP: $195.84
You Save: $58.08 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Switch, Temperature Detect, NO.2
Fits the following Toyota Models:
- Camry | 1992-2001 | CE, DX, LE, SE, XLE | 4 Cyl 2.2L, 6 Cyl 3.0L
- Celica | 1991-1999 | GT, GTS, ST, Turbo 4WD, Turbo All Trac | 4 Cyl 1.6L, 4 Cyl 1.8L, 4 Cyl 2.0L, 4 Cyl 2.2L
- MR2 | 1992-1994 | 4 Cyl 2.0L, 4 Cyl 2.2L
- RAV4 | 1996-2000 | 4 Cyl 2.0L
- Solara | 1999-2002 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
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Toyota Sensor, Water Temperature
Part Number: 89422-12010
$79.87 MSRP: $112.59
You Save: $32.72 (30%)
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.)
- Comment: (FOR E.F.I.)
- Replaces: 89422-30020
Fits the following Toyota Models:
- 4Runner | 1984-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Camry | 1983-1988 | DLX, DX, LE, STD | 4 Cyl 1.8L, 4 Cyl 2.0L, 6 Cyl 2.5L
- Celica | 1979-1989 | GT, GTS, LT, ST, Supra, Turbo 4WD, Turbo All Trac | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L, 4 Cyl 2.6L, 6 Cyl 2.8L
- Corolla | 1984-1989 | D, DX, GTS, LE, LE Limited, Q, SR5, STD | 4 Cyl 1.6L, 4 Cyl 1.8L
- Cressida | 1979-1988 | L, LG | 4 Cyl 2.6L, 6 Cyl 2.8L
- Land Cruiser | 1985-1989 | 6 Cyl 3.4L, 6 Cyl 4.0L
- MR2 | 1985-1989 | GT, Super Charger | 4 Cyl 1.6L
- Pickup | 1981-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
- Starlet | 1982-1984 | 4 Cyl 1.3L
- Supra | 1986-1988 | 6 Cyl 3.0L
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Toyota Thermo Switch Assy
Part Number: 88790-60050
$109.23 MSRP: $153.98
You Save: $44.75 (30%)
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Fits the following Toyota Models:
- Land Cruiser | 1992-1997 | 6 Cyl 4.0L, 6 Cyl 4.5L
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Toyota Switch, Temperature Detect
Part Number: 89428-41010
$122.42 MSRP: $174.03
You Save: $51.61 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Switch, Temperature Detect, NO.2
Fits the following Toyota Models:
- Avalon | 1995-2004 | XL, XLS | 6 Cyl 3.0L
- Camry | 1994-2006 | CE, DX, LE, SE, XLE | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Highlander | 2001-2007 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Sienna | 1998-2003 | CE, LE | 6 Cyl 3.0L
- Solara | 1999-2008 | SE, SLE | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
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Toyota Switch, Temperature Detect
Part Number: 89428-21010
$135.61 MSRP: $192.79
You Save: $57.18 (30%)
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Product Specifications
- Other Name: Temperature Sensor, Temperature Switch
Fits the following Toyota Models:
- Avalon | 2000-2004 | XL, XLS | 6 Cyl 3.0L
- Camry | 2002-2006 | LE, SE, XLE | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Highlander | 2001-2007 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Sienna | 2000-2003 | CE, LE | 6 Cyl 3.0L
- Solara | 2004-2008 | SE, SLE | 4 Cyl 2.4L, 6 Cyl 3.3L
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Toyota Sensor, Temperature
Part Number: 89429-47010
$59.13 MSRP: $82.66
You Save: $23.53 (29%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor, Water Temperature
- Manufacturer Note: MEXICO SPEC
Fits the following Toyota Models:
- Prius | 2004-2022 | E, G, L, S | 4 Cyl 1.5L, 4 Cyl 1.8L
- Prius AWD-e | 2019-2022 | 4 Cyl 1.8L
- Prius C | 2012-2019 | G, R, V | 4 Cyl 1.5L
- Prius Prime | 2017-2022 | 4 Cyl 1.8L
- Prius V | 2012-2017 | 4 Cyl 1.8L
- RAV4 Prime | 2021-2024 | SE, XSE | 4 Cyl 2.5L
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Toyota Switch, Temperature Detect
Part Number: 89428-20110
$119.34 MSRP: $169.66
You Save: $50.32 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Switch, Temperature Detect, NO.2; Temperature Switch
Fits the following Toyota Models:
- Echo | 2000-2003 | 4 Cyl 1.5L
- RAV4 | 2001-2004 | 4 Cyl 2.0L, 4 Cyl 2.4L
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Toyota Sensor, Water Temperature
Part Number: 89422-30020
$79.87 MSRP: $112.59
You Save: $32.72 (30%)
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.)
- Manufacturer Note: NO.1
- Comment: (FOR E.F.I.)
- Replaced by: 89422-12010
Fits the following Toyota Models:
- 4Runner | 1984-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Camry | 1983-1988 | DLX, DX, LE, STD | 4 Cyl 1.8L, 4 Cyl 2.0L, 6 Cyl 2.5L
- Celica | 1979-1989 | GT, GTS, LT, ST, Supra, Turbo 4WD, Turbo All Trac | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L, 4 Cyl 2.6L, 6 Cyl 2.8L
- Corolla | 1984-1988 | D, DX, GTS, LE, LE Limited, Q, SR5, STD | 4 Cyl 1.6L, 4 Cyl 1.8L
- Cressida | 1979-1988 | L, LG | 4 Cyl 2.6L, 6 Cyl 2.8L
- Land Cruiser | 1985-1989 | 6 Cyl 3.4L, 6 Cyl 4.0L
- MR2 | 1985-1989 | GT, Super Charger | 4 Cyl 1.6L
- Pickup | 1981-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
- Starlet | 1982-1984 | 4 Cyl 1.3L
- Supra | 1986-1988 | 6 Cyl 3.0L
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Toyota Switch, Temperature Detect
Part Number: 89428-12160
$122.42 MSRP: $174.03
You Save: $51.61 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Switch, Temperature Detect, NO.2; Fan Switch, Temperature Switch
- Manufacturer Note: NIPPONDENSO
- Replaces: 89428-12150
Fits the following Toyota Models:
- Celica | 1991-1996 | GT, GTS, ST, Turbo 4WD, Turbo All Trac | 4 Cyl 1.6L, 4 Cyl 1.8L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Corolla | 1993-2000 | CE, DX, LE, S, STD, VE | 4 Cyl 1.6L, 4 Cyl 1.8L
- Paseo | 1992-1999 | 4 Cyl 1.5L
- Tercel | 1992-1999 | DLX, DX, LE, STD | 4 Cyl 1.5L
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Toyota Sensor, Water Temper
Part Number: 89422-33040
$60.99 MSRP: $85.98
You Save: $24.99 (30%)
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Product Specifications
- Manufacturer Note: MEXICO SPEC
Fits the following Toyota Models:
- Avalon | 2019-2022 | Limited, Touring, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Camry | 2018-2024 | LE, No Grade, SE, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Corolla | 2019-2024 | 4 Cyl 1.8L, 4 Cyl 2.0L
- Corolla Cross | 2022-2025 | L, LE, S, SE, XLE, XSE | 4 Cyl 2.0L
- Crown | 2023-2025 | 4 Cyl 2.4L, 4 Cyl 2.5L
- GR Corolla | 2023-2025 | 4 Cyl 1.6L
- Grand Highlander | 2024-2025 | 4 Cyl 2.4L, 4 Cyl 2.5L
- Highlander | 2020-2024 | 4 Cyl 2.4L, 4 Cyl 2.5L, 6 Cyl 3.5L
- Mirai | 2021-2024 | Electric
- Prius | 2023-2024 | 4 Cyl 2.0L
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Toyota Sensor, Water Temper
Part Number: 89422-47010
$63.47 MSRP: $89.48
You Save: $26.01 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Water Temperature (For E.F.I.); Coolant Temperature Sensor, Temperature Sensor
Fits the following Toyota Models:
- Avalon | 2019-2022 | Limited, Touring, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Camry | 2018-2024 | LE, No Grade, SE, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Corolla | 2020-2024 | 4 Cyl 1.8L, 4 Cyl 2.0L
- Highlander | 2016-2023 | 4 Cyl 2.4L, 4 Cyl 2.5L, 4 Cyl 2.7L, 6 Cyl 3.5L
- Mirai | 2021-2024 | Electric
- Prius | 2016-2022 | 4 Cyl 1.8L
- Prius AWD-e | 2019-2022 | 4 Cyl 1.8L
- Prius Prime | 2017-2022 | 4 Cyl 1.8L
- Sienna | 2016-2020 | LE, SE, STD, XLE | 6 Cyl 3.5L
- Tacoma | 2015-2023 | Base, Limited, SR5 | 4 Cyl 2.7L, 6 Cyl 3.5L, 6 Cyl 4.0L
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Toyota Switch, Temperature
Part Number: 89428-20050
$137.76 MSRP: $195.84
You Save: $58.08 (30%)
Product Specifications
- Other Name: Switch, Temperature Detect, NO.2; Temperature Sending Unit
Fits the following Toyota Models:
- 4Runner | 1984-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.4L, 6 Cyl 3.0L
- Celica | 1980-1985 | GT, GTS, LT, ST, Supra | 4 Cyl 2.2L, 4 Cyl 2.4L, 4 Cyl 2.6L, 6 Cyl 2.8L
- Corona | 1980-1982 | DLX, LE | 4 Cyl 2.2L, 4 Cyl 2.4L
- Pickup | 1980-1989 | DLX, SDT, SR5, SR5 Turbo, STD | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
- Van | 1984-1989 | DLX, LE, STD | 4 Cyl 2.0L, 4 Cyl 2.2L
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Toyota Switch, Temperature Detect
Part Number: 89428-15030
$126.69 MSRP: $180.11
You Save: $53.42 (30%)
Product Specifications
- Other Name: Switch, Temperature Detect, NO.2
Fits the following Toyota Models:
- Camry | 1983-1986 | DLX, LE | 4 Cyl 1.8L, 4 Cyl 2.0L
- Celica | 1988-1992 | GT, GTS, ST, Turbo 4WD, Turbo All Trac | 4 Cyl 1.6L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Corolla | 1984-1986 | DX, LE, LE Limited, STD | 4 Cyl 1.6L, 4 Cyl 1.8L
- MR2 | 1985-1993 | GT, Super Charger | 4 Cyl 1.6L, 4 Cyl 2.0L, 4 Cyl 2.2L
- Tercel | 1983-1988 | DLX, SR5, STD | 4 Cyl 1.5L
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Toyota Switch, Temperature Detect
Part Number: 89428-33020
Product Specifications
- Other Name: Fan Switch
Fits the following Toyota Models:
- Camry | 1997-2001 | CE, LE, XLE | 4 Cyl 2.2L, 6 Cyl 3.0L
- Sienna | 2000-2003 | CE, LE | 6 Cyl 3.0L
- Solara | 1999-2003 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.0L
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Toyota Coolant Temperature Sensor Parts Questions & Experts Answers

Sensor, Water Temperature
89422-35010
Q: How to Troubleshoot and Repair Issues with the Coolant Temperature Gauge and Coolant Temperature Sensor on 1997 through 2001 Toyota Avalon?
A: To troubleshoot the coolant temperature gauge, check the fuses. If the gauge is not working, disconnect the wire at the Coolant Temperature Sensor and observe the gauge's behavior and if the reading drops, replace the sending unit. If the reading remains high, there may be a short in the wire. If the gauge fails to show any indication once the engine warms up, disconnect the wire at the sending unit and use a jumper wire to connect it to clean ground on the engine. Then, if the gauge still doesn't respond, there may be an open circuit. In order to remove the sending unit, drain the coolant, disconnect the wiring connector, and remove the unit using a wrench. Once you are installing the new unit, tighten it securely without using thread sealer. Finally, connect the wiring connector, refill the cooling system, and check for any coolant leakage or issues with the gauge's function.
Sensor, Water Temperature
89422-33030
Q: How to replace the Coolant Temperature Sensor on a 2003-2009 Toyota 4Runner?
A: Drain the engine coolant until the level is below the sensor. For V6 models, the ECT sensor is located at the back of the engine on the rear coolant crossover between the two cylinder heads. Remove the engine cover and disconnect the electrical connector from the ECT sensor. Unscrew the ECT sensor from the coolant crossover using a deep socket. Before installing the new ECT sensor, wrap the threads with Teflon tape to prevent coolant leakage. Installation is the reverse of removal, ensuring the ECT sensor is tightened to the specified torque. Refill the cooling system. For V8 models, the ECT sensor is located on the front coolant crossover directly under the throttle body. Remove the throttle body cover and the air intake duct, then disconnect the electrical connector from the ECT sensor. Unscrew and remove the ECT sensor from the front coolant crossover with a deep socket. Again, wrap the threads of the new ECT sensor with Teflon tape before installation, which follows the reverse of removal, ensuring proper torque. Finally, refill the cooling system.
Sensor, Water Temperature
89422-33030
Q: What is the Function and Importance of the Coolant Temperature Sensor on Toyota Sienna?
A: The engine coolant temperature (ECT) sensor is a thermistor that varies its resistance based on temperature changes, affecting the voltage signal sent to the PCM. As the sensor temperature decreases, resistance values increase, and as the temperature increases, resistance values decrease. Any issues in the ECT sensor circuits will trigger a diagnostic trouble code. Ensure the ignition key is in the OFF position and drain about 1 gallon of engine coolant, making sure the engine is completely cool before doing so. For 2007 and later models, remove the engine top cover by pulling up at the front edge and lifting the rear, then remove both air filter housing inlet ducts and the air filter housing assembly. For all models, wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion. Disconnect the electrical connector and carefully unscrew the sensor, which is located at the right end of the engine, below the cooling system pressure cap. Installation is the reverse of removal, taking care to handle the coolant sensor gently, as damage to it will impact the entire fuel injection system. Finally, refill the cooling system.

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