Preheating system (Mazda Capella GE)

In a cold engine, the autoignition temperature is not reached by compression alone, so preheating of the fuel mixture is necessary.

For this purpose, a glow plug is screwed into each combustion chamber. A glow plug basically consists of a housing with a heating rod pressed into it. When voltage is applied, the heater coil in the rod heats up to a temperature of over 850°C within a few seconds, ensuring that the warm-up period before starting rarely lasts more than 10 seconds. When the warm-up indicator light on the instrument panel goes out, the engine can be started.

To speed up engine warm-up, the glow continues after it has started. The preheating duration is determined by the control unit depending on the coolant temperature. The control unit is located behind the center console under the air duct.

Information about engine temperature is received by the control unit from the coolant temperature sensor. Based on the received data, the control unit determines the duration and magnitude of the current.

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