With a readout computer (OBD reader) you can read out fault codes and live data. In the event of a malfunction, it may be necessary to perform a measurement. Electrical components and systems in a vehicle can be measured with a multimeter or oscilloscope. In the event of malfunctions, the measurement results can provide information about defective components or wiring. In order to perform measurements, one must be able to locate the correct wire. Therefore, it is often necessary to consult a wiring diagram. The diagram shows, among other things, wire colors and thicknesses between a control unit, a sensor or actuator. If a breakout box is available, time can be saved because the measuring connections are easily accessible.
