How Does the Engine Coolant Temperature Sensor Function and Get Tested on an Acura Integra?

The Engine Coolant Temperature (ECT) is a thermistor that varies its resistance with temperature changes, affecting the voltage signal sent to the PCM. As the sensor temperature decreases, resistance increases, and as the temperature increases, resistance decreases. A trouble code for this sensor indicates a failure in the thermosensor circuit, typically requiring either wire repair or sensor replacement. To check the sensor, disconnect the electrical connector and measure the resistance between the terminals with the engine cool using an ohmmeter. After reconnecting the connector, start the engine and warm it to normal operating temperature, then disconnect the connector again to measure resistance and compare it to the resistance chart; if results are incorrect, replace the sensor. Check the supply voltage on the red/white wire with the ignition key ON, which should be approximately 5.0 volts; if not, look for an open circuit in the wire from the sensor to the PCM. Before installing a new sensor, wrap the threads with Teflon sealing tape to prevent leakage and corrosion. To remove the sensor, depress the locking tab, unplug the connector, and carefully unscrew the sensor, noting that coolant will leak out, so install the new sensor quickly. Handle the coolant sensor with care, as damage will affect the fuel injection system's operation. Installation follows the reverse order of removal, and check the coolant level, adding as necessary.

Genuine Acura Integra Coolant Temperature Sensor

Coolant Water Temperature Sensor

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4 Coolant Temperature Sensors found

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Acura Integra Water Temperature (Tw5) Sensor Assembly
Part Number: 37870-PJ7-003
$90.50 MSRP: $126.97
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Product Specifications
- Other Name: Sensor Assembly, Water Temperature (Tw5) (Matsushita) ; Coolant Temp Sensor; Coolant Temperature Sensor, Temperature Sensor
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura Integra Coolant Temperature Sensor
Part Number: 37870-RWC-A01
$30.70 MSRP: $43.85
You Save: $13.15 (30%)
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Product Specifications
- Other Name: Water Temperature Sensor; Temperature Sensor
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura Integra Water Temperature Sensor Assembly (Hadsys)
Part Number: 37870-PK2-015
$90.53 MSRP: $127.00
You Save: $36.47 (29%)
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Product Specifications
- Other Name: Sensor Assembly, Water Temperature (Hadsys) ; Coolant Temp Sensor
- Replaces: 37870-PK2-005
- Warranty: This genuine part is guaranteed by Acura's factory warranty.
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Acura Integra Sensor Assembly, Tw
Part Number: 37870-PE2-003
Product Specifications
- Warranty: This genuine part is guaranteed by Acura's factory warranty.

Acura Integra Coolant Temperature Sensor

The Acura Integra Coolant Temperature Sensor constantly tracks engine coolant heat so the engine control module can keep fuel delivery, ignition timing and fan operation in the sweet spot for power and protection. Threaded directly into a coolant passage, this Coolant Temperature Sensor bathes in flowing antifreeze, allowing the module's five-volt signal to be altered by the sensor's negative-temperature-coefficient thermistor, resistance dropping as the engine warms. Earlier Acura models applied a simpler coolant switch that only flipped a circuit for cold-start aids, but every modern Acura and every later Integra relies on the variable-resistance Coolant Temperature Sensor for richer cold mixtures, higher cold idle, fan control and the timed activation of EGR, evaporative purge and torque-converter lockup once proper warmth is reached. While switches merely provide an on or off ground, the thermistor style delivers a full temperature range, giving the Integra smoother starts, better fuel economy and reliable overheat defense. In Acura technical literature the Coolant Temperature Sensor is emphasized as a chief diagnostic item, and factory Acura specifications recommend routine inspection to help an aging Integra avoid surprise overheating. A failing Coolant Temperature Sensor can therefore cause hard starts, rough idle or fan malfunctions in any loyal Integra.

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Acura Integra Coolant Temperature Sensor Parts Questions & Experts Answers

Water Temperature (Tw5) Sensor Assembly
37870-PJ7-003
Q: How Does the Engine Coolant Temperature Sensor Function and Get Tested on an Acura Integra?
A:
The Engine Coolant Temperature (ECT) is a thermistor that varies its resistance with temperature changes, affecting the voltage signal sent to the PCM. As the sensor temperature decreases, resistance increases, and as the temperature increases, resistance decreases. A trouble code for this sensor indicates a failure in the thermosensor circuit, typically requiring either wire repair or sensor replacement. To check the sensor, disconnect the electrical connector and measure the resistance between the terminals with the engine cool using an ohmmeter. After reconnecting the connector, start the engine and warm it to normal operating temperature, then disconnect the connector again to measure resistance and compare it to the resistance chart; if results are incorrect, replace the sensor. Check the supply voltage on the red/white wire with the ignition key ON, which should be approximately 5.0 volts; if not, look for an open circuit in the wire from the sensor to the PCM. Before installing a new sensor, wrap the threads with Teflon sealing tape to prevent leakage and corrosion. To remove the sensor, depress the locking tab, unplug the connector, and carefully unscrew the sensor, noting that coolant will leak out, so install the new sensor quickly. Handle the coolant sensor with care, as damage will affect the fuel injection system's operation. Installation follows the reverse order of removal, and check the coolant level, adding as necessary.