Preheat device

On a cold engine, the ignition temperature of the fuel cannot be reached by compression alone, so the engine must be warmed up.

For this purpose, a rod glow plug is screwed into each combustion chamber. A glow plug basically consists of a body and a heating rod pressed into it. As soon as voltage is applied, the filament in the heating rod heats up to a temperature of 850°C within a few seconds, making the warm-up period to start rarely longer than 10 seconds. After the warm-up control lamp on the instrument panel goes out, the engine can be started.

The duration of heating is regulated by an electronic control unit located in the cabin next to the glove compartment on the right. The engine warm-up control unit receives information about the engine temperature from the coolant temperature sensor. Based on the information received, the control unit determines the duration and magnitude of the heating current.