![](../../../img/16/AK802948AA00ENG.png)
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The glow control unit is installed
in the relay box of the engine compartment. The engine-ECU
supplies the power to the control part of the glow control
unit when the ignition switch is turned ON. The energisation
to the glow plug from the battery is controlled by
installing the power-MOSFET (Metal Oxide Semiconductor Field
Effect Transistor) to the glow control unit for each
cylinder. When receiving the signal from the engine-ECU
through the control signal wire, the glow control unit
controls the Power-MOSFET, based on the signal duty, to
control the voltage for each glow plug. If detecting the
open or short circuit of the glow plug, or communication
failures to the engine-ECU, the glow control unit sends the
malfunction signal to the engine-ECU through the diagnosis
signal wire.
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![](../../../img/16/AK802950AB00ENG.png)
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The glow plug is installed to each
cylinder of the cylinder head. The glow plug performs
preheating of the combustion chamber with the ceramic
heating element on the acral part. The heating temperature
of the glow plug is changed by adjusting the voltage applied
to the glow plug through the duty control of the glow
control unit.
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![](../../../img/16/AK802953AB00ENG.png)
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The self control resistance is
built in the ceramic heating element of the glow plug. When
the current is going through the glow plug, the heating
element heats up and the self control resistance increases,
too. This gradually decreases the current going through the
heating element to restrict the amount of heating the glow
plug.
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