Control unit 1 AV (uu) has two connectors for connecting to the electrical wiring. The connection of the individual elements is shown in the respective wiring diagrams (see subsection 12.5.2, subsection 12.5.3, subsection 12.5.4). The control unit sets the optimal operation of the engine, depending on the most important factors. It controls the injection of fuel in the required ratio (air-fuel), ignition and ventilation system.