Sensors convert a physical quantity into a resistance or voltage. The sensors are connected to an ECU that reads the voltage level or frequency of the sensor signal. The ECU translates the sensor signal into a speed, pressure, temperature or sees an on or off signal. The page “sensor types and signals” lists the different categories in which we divide the sensors within the automotive sector (passive, active, intelligent) and the signal transfer between sensor and ECU (AM, FM, PWM). If it turns out that a sensor signal is not in order, we can look for the cause with the voltmeter or oscilliscope: is it the sensor, the wiring or the ECU? These measurement techniques are described on the page “Troubleshooting the wiring”.
Furthermore, this page lists the sensors that we often encounter in the automotive industry on the body, chassis, in the engine compartment or in the interior / cabin.
The operation, application and possible malfunctions of these sensors are described on each page.