A method for guiding an operator of a mobile working machine (or a device coupled to the machine) to a position to be located for fault-remedying, defect-eliminating or maintenance work, by determining data in respect of the position that is to be located on the working machine (or the device coupled to the machine) using a diagnosis system, transmitting the data to a portable device in respect of the position that is to be located, and outputting direction instructions to the position based on the data, by virtue of the portable device in order to guide the portable device to the position that is to be located.
