With the development of automobile technology, now more and more rely on sensors, the sensor detects the signal, and then can be fed back to the car computer, through the computer to control the corresponding parts. If the sensor is damaged, the corresponding components will not work properly, so Automotive sensors have a very important position.

          The four major automotive sensors we mentioned include: air flow sensor, intake pressure sensor, throttle position sensor, water temperature sensor Among them, the air flow sensor is currently mainly used two kinds of hot wire type air flow sensor and hot film type air flow sensor, generally installed between the air filter and the throttle. The function is to calculate the air flow per unit time, which is used as one of the basic signals to determine the fuel injection quantity.           The intake pressure sensor of Automotive sensors is abbreviated as MAP sub-resistive intake pressure sensor. It is generally installed on the intake manifold. It is usually integrated with the intake temperature sensor. It can be used to detect the absolute pressure of the intake manifold. The size of the rotation speed and the load detect the change of the absolute pressure in the manifold, and then convert it into a signal voltage and send it to the engine ECU. The ECU controls the size of the basic fuel injection amount according to the size of this signal voltage.

           The throttle position sensor is installed on the throttle valve and is generally used to detect the opening of the throttle valve. It can be linked with the throttle valve through the lever mechanism to reflect the different operating conditions of the engine. The throttle position sensor can input the electronic control unit (ECU) after detecting different operating conditions of the engine, thereby controlling different fuel injection quantities.

            The water temperature sensor is actually a semiconductor thermistor. The lower the temperature, the greater the resistance. Conversely, the smaller the resistance, installed on the water jacket of the engine block or cylinder head, it can directly contact the cooling water. Used to detect the temperature of engine cooling water. The electronic control unit corrects the fuel injection and ignition timing based on the water temperature signal, and installs a water temperature warning light on the instrument panel. When the water temperature sensor is faulty, the phenomenon is ON, the engine fault light is always on, the water temperature always displays the maximum value of 120 degrees Celsius, the engine is torque-limiting, and the engine is weak. The detected fault code is P003D.