control of the glowplugs is by pulse width modulation.The essential differences from the glowplug systems on previous models are as follows: In the initial heating stage, system voltage may also be applied for a short time. The quick-start glowplugs are designed for a voltage of between 5.3 and 7.8 Volts. Bit serial data interface (BSD) and electrical leads.The glowplug system consists of the following components: ![]() Have a read of WDS - I cannot see all of the fault codes but the glowplug control unit and auxiliary fan both use inputs from the coolant temperature sensor and the fan is telling you there is a problem with the fan activation circuit whilst the 4203 error is telling you there is no communication with the glowplug control unit via the Bit Serial Data interface.
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