A bad sensor may result in a rich fuel-air mixture, leading to black smoke from the exhaust pipe and poor fuel economy. Your car’s coolant temperature sensor helps its ECU decide the fuel-air mixture ratio for combustion.
COOLANT TEMPERATURE CODE
It will also register an error code that can be read using an OBD-2 scan tool. Illuminated Check Engine LightĪ faulty sensor can result in the ECU activating the Check Engine Light on your car’s dashboard. The ECU will then adjust the fuel injection, ignition timing, and variable valve timing, further raising the engine’s temperature and causing it to overheat. Engine OverheatingĪ malfunctioning coolant temperature sensor may send an incorrect “cold” signal to the ECU, tricking it into believing the engine isn’t hot yet. Here are the key symptoms that accompany coolant temperature sensor failure: 1. 8 Signs of a Faulty Coolant Temperature Sensor Now let’s discuss the eight signs of a faulty sensor that can take a toll on your car’s engine performance. Your car’s cooling system may have multiple coolant temperature sensors, with the primary sensor located on the engine block near the thermostat housing or the radiator. The ECM detects a change in the voltage signal from the sensor and uses it to control: Your car’s coolant temperature sensor usually has a Negative Temperature Coefficient (NTC), which means its resistance decreases with a rise in coolant temperature, resulting in a reduced voltage output signal. The ECM supplies the sensor with a constant reference voltage of 5V which the sensor converts into a suitable voltage signal according to the coolant temperature. It conveys this reading to the Engine Control Module (ECM), also referred to as the Engine Control Unit (ECU), which acts as the “brain” of your car.
The coolant temperature sensor measures the temperature of the engine coolant through a resistor circuit. What Is an Engine Coolant Temperature Sensor?
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