The readings from this sensor are then fed back to the Engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing. In this case, you should look at the symptoms. The coolant temp sensor is used to measure the temperature of the engine coolant of an internal combustion engine. This is also the case with some crankshaft position sensors on some models. If the fault is within the electrical components or the circuit and the fault only appears for a second or less then a second, the computer may not register the fault, if not all conditions are met. But it may differ in certain models depending on the enable criteria set for the computer. When the engine is cold, the fuel mixture must be richer to prevent stalling and engine stumble.
#Engine coolant temperature sensor code
Question: When the ECT is bad, should the trouble code definitely come or not?Īnswer: Ideally, this should be the case. ENGINE COOLANT TEMPERATURE SENSORS Purpose and Function Computer-equipped vehicles use an engine coolant temperature (ECT) sensor. Usually, these are the ones the cause trouble at idle. The ECT sensor comes in different wiring diagrams and colors depending upon the car. It sends the reading to the car computer (ECU), which adjusts the amount of fuel injection into the combustion chamber. The principle working of this sensor involves the use of an. If the temperature climbs when idling, you may want to check the coolant level, radiator fan and drive belt. The engine coolant temperature (ECT) sensor is a resistor-based sensor, which measures the temperature of the engine’s coolant. Coolant temperature sensors are also known as engine coolant temperature sensors or ECT sensors. The coolant sensor is extremely important because the sensor’s input to the PCM affects the operating strategy of the entire engine management. At the beginning of the measurement the key is switched on and shortly after the engine is started which can be seen from the spike in the signal voltage. Channel 1 (red) shows the signal of the coolant temperature sensor during a warming up of the engine. There is an inverse relationship between the electrical resistance and the engine.
In terms of resistance capacity, this coolant sensor has 20,000 ohms at 248 degrees Fahrenheit. How high can the engine get before it’s not normal?Īnswer: It depends on the model, but a good operating temperature ranges at 195-225, including modern engines. The coolant sensor detects the change in temperature and signals the Powertrain Control Module (PCM) so it can tell if the engine is cold, warming up, at normal operating temperature or overheating. Figure 3: Lab scope measurement of coolant temperature sensor. The coolant temperature sensor is fastened to the intake manifold of an engine coolant and is often referred to as a negative temperature coefficient type of sensor. It starts going back down when I start moving again. Question: When idle, I’ve noticed the ECT climb up to 235 degrees F and continue. I would check the control unit or motor for the door. Question: Will my ECT cause cool air to blow?Īnswer: The problem could be with the HVAC blend door.
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