Be sure that the sensor is sufficiently waterproof and avoid submerging the terminals. In the event that you cannot start your motor, you can simulate hot and cold readings by immersing the sensor in hot and cold water. No change in voltage indicates a faulty coolant sensor. It should be down to as low as 0.25 volts after the motor warms up. Disconnect everything and measure the voltage again. Reconnect the sensor and run the engine for about two minutes before turning it off. Proceed as with the ohmmeter and attach it to the sensor while the ignition is off. i Use a multimeter to check the sensor.If this is not the case, the sensor isn’t working properly. The difference should be at least 200 ohms. Compare this reading to the one from a cold engine. Now disconnect everything as before and measure the resistance. Run the engine for around two minutes and then shut it off again. Measure the resistance and write it down. Attach the ohmmeter to the sensor’s terminals. Disconnect the wiring from the sensor while the ignition is off. i Use an ohmmeter to check the sensor.A value of up to 5 volts indicates that there is no problem on this end. Connect the red line of the multimeter to terminal two and ground it with the black one. Then turn the ignition key without starting the motor. To do so, remove the cables connected to the sensor. i Use a multimeter to check the sensor’s wiring harness.If the connector isn’t properly inserted or the cables and wires are broken or corroded, this is the likely cause of the problem. If there are issues with the electrical connections, the solution may be as simple as plugging in them in properly. If you can’t find the sensor, consult the technical documentation for your vehicle. The radiator or thermostat housing are a good place to look. By necessity, the sensor is usually found near the front of the engine. If you see one of these codes or otherwise suspect the coolant sensor is the source of your woes, proceed along the following steps: Codes associated with this range from P0115 to P0119. Generally, OBD II error codes from the ECU will be the first conclusive evidence pointing towards a defective coolant temperature sensor. There are a few ways how one can test for a faulty coolant temperature sensor. In these cases, a faulty coolant temperature sensor can cause a car not to start at all. These problems are caused by faulty readings, leading to the fuel system injecting inappropriate amounts of fuel and the engine running too hot on account of the cooling system not being told to engage by the control unit. Often, the “Check Engine” light will turn on. Other indicators can include black smoke emanating from the exhaust pipe and cooling fans not activating. Among the most common are an increase to fuel consumption, difficult engine starts, and higher idling speeds. There are several issues that point towards the coolant temperature sensor being damaged. Symptoms of a faulty engine coolant temperature sensor It basically has the same function as an old thermometer, but uses resistance instead of mercury to determine the temperature. Measuring the effect of the lowered or raised resistance allows the ECU to determine the temperature measured. This charge is the result of voltage passing the sensor’s internal resistance, the latter of which is lowered as temperatures increase and vice versa. In a nutshell, the sensor delivers a small charge which the engine control unit can read. What is a coolant temperature sensor?Ĭoolant temperature sensors were developed to determine the operating temperature of the engine. With advances in technology, not only was plain water abandoned as the primary cooling liquid, but sensors for determining the coolant’s temperature were developed as well. In olden times, this consisted of water, occasionally mixed with antifreeze in winter to keep the engine block from becoming an engine block of ice. The most critical part of this system is the coolant. This in turn creates the need for cooling the engine, and this is where the engine cooling system comes into play. This is a natural consequence of using rapidly occurring explosions of fuel mixed with air to create the locomotion that drives the wheels. In a car with an internal combustion engine, the engine will typically run hot.
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