Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant.


The video maker is not affiliated with OBD-Codes.com. The CTS is usually found at the front of the car, near the thermostat housing, or on the radiator.

Since this is a two-wire sender direct from the manufacturer, the thread sealer is acceptable and won't interfere with sender operation. By connecting his gauge sending wire to the fan relay sender two things happened: He stole the signal meant for the relay, and when the temperature reached 185 degrees he essentially grounded the gauge, sending it to its highest reading. It measures the temperature of the coolant in the radiator. A cold engine will provide an open circuit, and no current can flow from the sender to the fan relay. Because the fan relay sender is just a switch, it doesn't detect variables in temperature like a typical gauge sender does. The ECT sensor is usually a two wire sensor that uses a 5 volt reference from the PCM with a ground signal back to the PCM.

The CTS is connected to the ECU by a connector, which you’ll need to unfasten and remove. We'll answer that one below, because there are some tricky options that will give you another port or two, and sometimes you just have to get a little creative. If your coolant temperature is 210 degrees, it's the same as seeing 185 degrees, and it's switched on. Gauge manufacturers will include a sender with their gauge and recommend not using a sender from another company or gauge because of differences in readings. You can get creative, but it's important to remember that you want the sender to access the coolant reading from below the thermostat, not above. Once the new sensor is in place, the only thing left to do is reconnect the cable.

The temperature sender is typically used as the reading for the temperature gauge on the instrument cluster. For specific readings for your application, see a vehicle-specific repair manual. By connecting the gauge wire, which requires a variable ohms sender, the signal is stolen from the relay.

you take on any vehicle. (adsbygoogle = window.adsbygoogle || []).push({}); When the ECT (engine coolant temperature) is high (hotter), the resistence is low, and when the ECT is low (cooler) the resistence is high.

To make sure the new sensor is working, start the engine and as it warms, monitor the temperature gauge on the dash to make sure the correct temperature is being sustained.

For more information, visit the Prestone homepage. It's best to make sure where you have the most room/access for the sender before you seal everything up, so do some test fitting and make sure that you can install the sender after the spacer is in place. When vehicles started coming off the showroom floor with fuel injection, we started to see more sensors and switches than ever before.

A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off. This half-inch spacer fits between the intake manifold and thermostat housing, and provides two additional ports for additional senders and switches. Disconnect the connector, and set the cable aside so it’s out the way. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. The tip of the CTS is probably located right next to the engine coolant. Below, we list the other signs and symptoms which could indicate a CTS issue: If in any doubt about which component is faulty beneath the bonnet, take your car to a professional mechanic for a complete diagnosis. This resistance reading is sent to the vehicle's PCM/ECM (car's onboard computer) and is or can be used to activate emission controls or turn the engine's cooling fan on.

In this guide, we take a closer look at coolant temperature sensors, offering information on what they do and how they work, and step-by-step advice on diagnosing and replacing a faulty sensor yourself. These brass fittings can be found at many auto parts stores like NAPA, or at home improvement stores. The resistance of the sensor varies with temperature, this is how the ECU can monitor temperature changes. The engine coolant temperature sensor is temperature-variable resistor, which usually has a negative temperature coefficient. This information is also used to send an accurate reading of the engine temperature to a gauge on the dashboard. Set the new sensor in the threads and twist clockwise by hand, making sure the sensor is well-seated in the socket. Because the fan relay sender is just a switch, it doesn't detect variables in temperature like a typical gauge sender does. ECT sensors. The sensor works by measuring the temperature … He wanted to keep the factory gauge, which only read C to H, but wanted an additional gauge that would tell him what the actual temperature is.


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