Troubleshooting is a form of problem solving, often applied to repair failed processes or products.
It is a logical, systemic search for the source of a problem in order to solve it and make the process operational again.
Simply put, to troubleshoot is to embark on a process of solving a problem or determine a problem to an issue. For example, if the sales or income of a company is shrinking; the managers may conduct an inquest into the reasons for the slacking income with a view to mitigate it.
Similarly, in automobile engineering, the use of analyzer helps to detect the fault in a car with a view to recertifying it.