Targeted search and elimination of all existing faults are carried out using special branded devices. These devices are very expensive and, as a rule, are available only in a specialized workshop. For this reason, only a list of basic checks is given below.
Check voltages and condition battery charging.
Blew all fuses.
Disconnect and connect the plug connectors of all relevant electronic systems. Check the reliability of the plug connections and fastening of the wires in the engine compartment.
Check the reliability of all ground connections and the impeccable condition of the contacts.
Check all hoses and pipes for leaks. At the same time, pay attention to the absence of porosity, cracks and the reliability of connections in the places of connectors.