Coolant temp sensor's wires are shorted to Ground.This DTC indicates one of several things:.This DTC tells you that the PCM is seeing a temperature reading above 250° F (121° C).P0117: Engine Coolant Temperature (ECT) Circuit Low Input. TIP 3: Some of my testing suggestions involve tests with the engine running, this means you've got to be on your toes and alert. TIP 2: A scan tool (with Live Data capability) is the preferred method to test these two diagnostic trouble codes (Don't have a scan tool? Need a scan tool? Check out my recommendation: Actron CP9580 Scan Tool). If your vehicle is overheating, this article won't be of much help since this test article only diagnoses the ECT sensor. TIP 1: A malfunctioning engine coolant temperature sensor will NOT make your vehicle overheat. Here are some specific differences between both of them: The engine coolant temp (ECT) sensor measures the temperature of the coolant, the cylinder head temperature (CHT) sensor measures the temperature of the metal itself (of the cylinder head) and no coolant is involved.Īlthough you can apply this info to any Ford vehicle with a V6 or V8, this info concentrates on the Ford 4.6L and 5.4L V8 engines. This article concentrates on the engine coolant temperature sensor (see photo below). One is called the engine coolant temperature (ECT) sensor and the other is the engine cylinder head temperature (CHT) sensor. The more the input readings, the better the output decisions are.What Is P0266 Code On 6.0 Powerstroke: How To Fix?įord uses two different temperature sensors. 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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