The recorded parameters are returned via signals to the engine control unit, which in turn uses this data to adjust the correct amount of fuel and a certain ignition angle. In some vehicle models, it can be used to switch to an air vent cooling system.
As the sensor temperature is measured, its resistance level can vary.
There are two types , depending on the change in resistance:
- Sensors with negative temperature coefficient, work on the principle that the internal resistance decreases as the temperature rises and vice versa;
- Those with a positive temperature coefficient. As the temperature rises, they increase the resistance.
Alarm ones with negative coefficient are installed in almost all cars. The vehicle control unit sends an adjustable voltage (9-volt) directly to the coolant temperature sensor. Depending on the drop in voltage, the resistance on the alarm contacts will drop and the control unit will immediately fix it.
In this case, the vehicle’s computer or mechanical system will be able to calculate the engine temperature and then (using data from other devices) apply the reference tables to make adjustments to the engine drives, i.e. change the fuel level and intake or ignition advance angle.
The resistance of the coolant sensor is very dependent on external factors. These are the air temperature outside the vehicle and various drive characteristics. For the most correct operation of the alarm system you should use coolant recommended for a certain time of year, it is expensive, but prolongs the life of your car.
How do I know if my coolant temp sensor is bad?
There are a number of ways you can find out what you need to change the sensor. If you have all other systems in your car, the dashboard will report a malfunction with a light signal. If your car has computer control, the problem can be detected by decoding the combination on the monitor.
Depending on the year of manufacture of the car, as well as its brand, many car enthusiasts note the increase in fuel consumption at the engine.
If you have a mechanic, not a computer control system, here are the signals that you need to buy a new coolant temperature sensor:
- The vehicle is now consuming more fuel than usual;
- When the car starts up and the engine reaches its maximum temperature, it dies;
- There’s a problem with starting;
- There’s black smoke coming out of the silencer tube.
What’s very good is that modern ones make it possible to check almost at home. It is only important to have at hand a multimeter for measuring voltages (although it is not necessary to know this indicator for initial assessment) and resistances, as well as any device for measuring temperature. You’ll also need a key for 19, an electric kettle and a container to drain the coolant. Obviously, the last one is draining. All you have to do is drain the coolant down to a level just below the device position. Next, disconnect the wiring and turn the sensor with the key 19.
Where is the temperature sensor on a Ford f150?
The element is a very important element responsible for the coolant temperature of the cooling system. The essence of its work is to give a signal to the motor control unit, which regulates the composition of the fuel mixture, as well as the speed of the crankshaft, as well as the angle of advance of the ignition. It is responsible for the correct functioning of the cooling system.
Although the device itself is quite simple and does not require expensive maintenance, it occasionally fails. Malfunctions are not quite obvious, as they coincide with those of some adjacent components. In order to repair it you should find the location first. Most often it is installed near the thermostat or radiator, in some cases the on-board computer uses the readings from both or one of the coolant sensors, depending on the vehicle brand and model.
For example, on 2008 the Ford F-150 its location is in front of the engine compartment. Anyway, the general rule is to open the hood and search for the front, center of motor (the upper radiator hose) in order to find a thermostat housing.
Where is the CHT sensor located?
The CHT temperature sensor is designed to measure the material temperature of the unit head. This solution allows for more accurate measurement of this parameter. The data obtained is sent to the dashboard and shown on the corresponding pointer. The temperature data is also used to calculate the fuel injection torque and its duration, which varies depending on the engine heating level. In addition, it is responsible for activating the cooling fan when the engine heats up to a certain level. The sensor is usually located on the rear of the driver side cylinder head.
Where is the temperature sensor on a 2000 Ford f150?
It can usually be found in the outlet, but sometimes it is placed directly on the vehicle thermostat housing. The unit has a special threaded housing where it can be screwed into. The thermistor itself, as befits the heart of the part, is inside a special case. The material of the case has a high thermal conductivity. Usually only one sensor is installed at car dealerships. But there are exceptions. On 2000 Ford its location is near the rear of the engine.