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Connections to the powertrain control module (PCM)
5
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Pre-heating control module
The pre-heating system consists of one pencil-type glow plug per combustion chamber, a pre-heating control module, the PCM and a glow plug indicator light and the corresponding electrical connections.
The pre-heating control module and the glow-plug indicator light are actuated by the PCM.
The PCM receives information on current coolant temperature from the engine coolant temperature (ECT) sensor.
The PCM controls the per-heating and post-heating phases, using the coolant temperature and engine speed as control parameters.
The post-heating phase begins after the engine has started. After approx. 30 seconds, the pencil-type glow plugs are switched off by the PCM .
The pencil-type glow plugs are also shut off if the engine speed reaches 2500 rev/min.