What is the purpose of the Engine Coolant Temperature (ECT) sensor for the Honda Prelude?

The Engine Coolant Temperature (ECT) sensor works as a thermistor whose resistance varies with coolant temperature. Hence ECT determines how much fuel is going to be mixed with air into the engine. The engine will lose its power and stop if it is unplugged. So you should measure the ECT sensor resistance while the engine is cold and hot to perform this test. In other words, it should read 5000 ohms once it is cold then 100-400 ohms in its hot state. This could mean that the sensor may not be working properly. Disconnecting the battery, draining the coolant, removing the old sensor, and installing a new one with Teflon sealant will facilitate replacement. Top off the coolant, start the engine, and check for leaks afterwards.

Genuine Honda Prelude Coolant Temperature Sensor

Coolant Water Temperature Sensor

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5 Coolant Temperature Sensors found

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Honda Prelude Sensor Assembly, Water Temperature (Tw5) (Matsushita)
Part Number: 37870-PJ7-003
$71.63 MSRP: $101.17
You Save: $29.54 (30%)
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Product Specifications
- Other Name: Coolant Temp Sensor
- Warranty: This genuine part is guaranteed by Honda's factory warranty.
Fits the following Vehicles:
- 1988-1990 Honda Prelude | 2 Door 2.0S | KA 4AT, KA 5MT, KL 4AT, KL 5MT
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Honda Prelude Sensor Assembly, Water Temperature (Hadsys)
Part Number: 37870-PK2-015
$71.64 MSRP: $101.19
You Save: $29.55 (30%)
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Product Specifications
- Other Name: Coolant Temp Sensor
- Replaces: 37870-PK2-005
- Warranty: This genuine part is guaranteed by Honda's factory warranty.
Fits the following Vehicles:
- 1988-2001 Honda Prelude | 2 Door 2.05SI, 2 Door 2.0SI, 2 Door Base, 2 Door S, 2 Door SI, 2 Door Sivtec, 2 Door TYPESH | KA 4AT, KA 5MT, KL 4AT, KL 5MT
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Honda Prelude Sensor Assembly, Tw
Part Number: 37870-PD1-003
$52.84 MSRP: $74.63
You Save: $21.79 (30%)
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Product Specifications
- Replaced by: 37870-PD1-911
- Warranty: This genuine part is guaranteed by Honda's factory warranty.
Fits the following Vehicles:
- 1983-1987 Honda Prelude | 2 Door DX | KA 4AT, KA 5MT, KH 4AT, KH 5MT, KL 4AT, KL 5MT
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Honda Prelude Sensor Assembly, Tw
Part Number: 37870-PD6-003
Product Specifications
- Other Name: Coolant Temperature Sensor
- Warranty: This genuine part is guaranteed by Honda's factory warranty.
Fits the following Vehicles:
- 1985-1987 Honda Prelude | 2 Door SI | KA 4AT, KA 5MT, KL 4AT, KL 5MT
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Honda Prelude Switch Assy., Thermo (A-90)
Part Number: 37760-PB2-003
Product Specifications
- Other Name: Fan Switch
- Replaces: 37760-634-005, 37760-PA0-000
- Warranty: This genuine part is guaranteed by Honda's factory warranty.
Fits the following Vehicles:
- 1979-1982 Honda Prelude | 2 Door ** | KA 5MT, KA HMT, KH 5MT, KH HMT, KL 5MT, KL HMT

About Honda Prelude Coolant Temperature Sensor

A Honda Prelude needs to be kept in good working condition in your vehicle. The online catalog we provide will get you through the ordering process safely and securely. All genuine Honda Coolant Temperature Sensors from us are shipped directly from authorized Honda Dealer. If you want search for Honda Coolant Temperature Sensor fast and easily, just come to Hondapartsnow.com to look for your parts.

Honda Prelude Coolant Temperature Sensor Parts Questions & Experts Answers

Sensor Assembly, Water Temperature (Hadsys)
37870-PK2-015
Q: What is the purpose of the Engine Coolant Temperature (ECT) sensor for the Honda Prelude?
A: The Engine Coolant Temperature (ECT) sensor works as a thermistor whose resistance varies with coolant temperature. Hence ECT determines how much fuel is going to be mixed with air into the engine. The engine will lose its power and stop if it is unplugged. So you should measure the ECT sensor resistance while the engine is cold and hot to perform this test. In other words, it should read 5000 ohms once it is cold then 100-400 ohms in its hot state. This could mean that the sensor may not be working properly. Disconnecting the battery, draining the coolant, removing the old sensor, and installing a new one with Teflon sealant will facilitate replacement. Top off the coolant, start the engine, and check for leaks afterwards.