With a diagnostic scanner (OBD reader), fault codes and live data can be read out. In the event of a fault, it may be necessary to perform a measurement. With a multimeter or oscilloscope, electrical components and systems in a vehicle can be measured. In case of faults, the measurement results can provide clarity about defective components or wiring. To carry out measurements, you must be able to locate the correct wire. That is why it is often necessary to consult a wiring diagram. The diagram shows, among other things, wire colors and gauges between a control unit, a sensor, or an actuator. If a breakout box is available, you can save time because the measurement connections are easily accessible.
