13E-4
1. Overview
• In the common rail system, an electronic control unit monitors various aspects of the engine (engine speed, throt-
tle opening, coolant temperature, etc.) using information from sensors. In accordance with these data, the elec-
tronic control unit effects control over the fuel injection quantity, fuel injection timing, and fuel injection pressure in
order to optimize the engine’s operation.
• The electronic control unit has a diagnostic function that enables it to recognize abnormalities in the common rail
system’s major components and alert the driver to them.
• The common rail system consists mainly of an electronically controlled supply pump; injectors; a common rail;
and the electronic control unit and sensors that are used to control the other components.
STRUCTURE AND OPERATION
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