BMW E60 530d Winter Cold START
Téli mindennapos indítások egyből tövig tekert kulccsal, az izzítást
There is the original brief in WDS:
The glowplug control unit communicates with the DDE control unit via the
bit serial data interface.
The required heating output is determined by the DDE control unit on the
basis of the following operational parameters:
Two other operational parameters determine the point at which glowplug
function is activated and deactivated:
The DDE control unit transmits the heating request to the glowplug control
unit via the bit serial data interface. The glowplug control unit puts the
request into effect by activating the glowplugs by means of a pulse-width
modulated signal. In addition, the glowplug control unit sends diagnostic
and status information back to the DDE control unit.
At coolant temperatures below 25°C, there is a preheating period of 0.5
seconds. The preheating period increases as the temperature falls, reaching
a maximum of 2.7 seconds at a coolant temperature of less than -25°C.
Activation of the glowplug system on the instrument cluster only occurs at
coolant temperatures below 0°C.
At coolant temperatures below 30°C, there is a temperature-dependent
after-heating period to improve idling and Exhaust emission characteristics.
Start preheating takes place for approx. 10 seconds if after the preheating
time has elapsed the engine is not started and the ignition remain on.