![]() Replace with a new one and get back on the road in no time. Remove the lead coming from the terminal and loosen the sensor with a socket or wrench. Be sure the cooling system is not pressurized and cooled completely. Replacing the coolant temperature sensor is an easy process that anyone can do at home with some basic mechanic's tools. Step 5 - Replace Defective Coolant Temperature Sensor If not, then it is not working correctly. You should see a much lower reading on the ohm meter. You should have a reading of approximately 2000 ohms. Connect the black lead of the meter to the body of the cold sensor and the red to the terminal. If you have a new sensor on hand and want to check it, you can do this easy test. If you do not see anything that is more than 200 ohms in difference, the coolant temperature sensor is defective and will need to be replaced. You are looking for readings that are more than 200 ohms in variance between a cold and warm engine. While the engine is running you need to be continually checking the digital ohm meter. Let the engine run for a full two minutes to allow the engine to get up to running temperature. Step 3 - Check Readingsįor the testing process you will need to turn the engine on. Before turning the meter on, set the digital reading to the 20K range. Next, remove the wire from sensor terminal and connect the red lead to the terminal end of the coolant temperature sensor. Connect the black lead of the digital ohm meter to a solid grounding. With the use of a digital volt-ohm meter you can easily tell if the sensor is faulty or not. Testing the coolant temperature sensor is a very quick process. You will see a small terminal sticking out of the block with a wire lead coming from it. ![]() Look at the front of the engine block in the middle of the pulleys. You will search for the sensor within the engine block itself, using a drop light if you need help to see it better. Pull the latch for the hood and open it, making sure it is secure before letting go. The coolant temperature sensor is located on the engine block under the hood. The more the input readings, the better the output decisions are.Step 1 - Locate Coolant Temperature Sensor One ECT sensor might not be as much reliable to operate the fan efficiently. This secondary ECT Sensor works together with the primary ECT Sensor to optimize the working of the car and give an accurate reading of the coolant to the car ECU before it is heated up, saving it from potential overheating problems.Īdding an ECT sensor is another way to get a more accurate reading. To keep the radiator of the engine working properly and to regulate the temperature of the engine constantly, locating these leakages is also very important. However, the one location where the secondary ECT Sensor is seldom placed in the radiator is the outlet of the radiator tank or pipe as it is the most common place for leakage of the engine coolant fluid. The location of this sensor is not very common and is found in different locations in different cars. The other Engine Coolant Temperature Sensor is known as the secondary ECT sensor or the ECT sensor 2. This cylinder head closes the top opening of the cylinders and packs it into a casing forming a combustion chamber for the fuel and air to mix and react. ![]() ![]() In an internal combustion car’s engine, the cylinder head is placed on the top of the car’s cylinders above the cylinder block. This sensor is located on the coolant passage next to or in the thermostat housing of the cylinder block or cylinder head. The main Engine Coolant Temperature Sensor is known as the primary ECT sensor or ECT sensor 1. One sensor is located near the thermostat valve housing, and the second one is located in the radiator outlet tank or pipe. The pair sensors can be installed in different places, depending on the make, model, and year. Most of the cars that are being used nowadays contain pairs of Engine Coolant Temperature (ECT) Sensors for the purpose of sending accurate and precise information to the car ECU. These sensors are directly connected to the car ECU for measuring the temperature of the engine coolant. This sensor consists of wires ranging from 1 to 4. But modern cars, have coolant temperature sensors placed next to the thermostat housing, which is directly connected to the car ECU.
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