The temperature sensor inside is a semiconductor thermistor, the lower the temperature, the greater the resistance; On the contrary, the smaller the resistance, installed in the engine cylinder block or cylinder head of the water jacket, and direct contact with the cooling water, thus side of the engine cooling water temperature.

Electronic oil pressure sensor installed in the engine of the main road, when the engine running, pressure measurement device to detect the oil pressure, the pressure signal into electrical signals sent to the signal processing circuit, a voltage amplification and current amplifier, through the pressure signal of signal lines will be enlarged to connect to the oil pressure indicator, and change the oil pressure indicator inside by the current ratio of 2 coil, thus indicating the engine oil pressure. The pressure signal amplified by voltage and current is also compared with the alarm voltage set in the alarm circuit. When the voltage is lower than the alarm voltage, the alarm circuit will output the alarm signal and light the alarm lamp through the alarm line.

A crank sensor is an electronic device used in an internal combustion engine to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control ignition system timing and other engine parameters.

ABS sensor is used in the abs (anti-lock Braking System) of motor vehicles, most of the ABS System by the inductive sensor to monitor the speed of the car, the ABS sensor and synchronous rotation with the wheel gear ring action, output a set of quasi sinusoidal ac signal, its frequency and amplitude is related to the wheel speed. The output signal is transmitted to ABS ECU to realize real-time monitoring of wheel speed.

The intake pressure sensor is installed on the intake manifold of the car. It can sense the change of the vacuum in the intake manifold with different rotating speed loads of the engine, and then convert the change of the resistance inside the sensor into a voltage signal for the ECM computer to correct the Angle of fuel injection and ignition timing.