PRODUCT OVERVIEW
JH Series Operation Manual 19
MAIN ELECTRONIC CONTROL COMPONENTS AND
FEATURES
Component/feature Description
Controller By controlling the fuel injection timing, volume, pressure and number in accordance with the
target speed indication entered from the accelerator sensor, the controller adjusts the engine
speed and power.
Fuel pump (supply pump) The fuel pump supplies fuel to the common rail.
Common rail The common rail stores the compressed high-pressure fuel from the supply pump and
distributes fuel to the injector in each cylinder.
Fuel injector The Fuel Injectors the high-pressure fuel from the rail to the engine combustion room after
receiving a signal from the ECU in the most appropriate injection timing, injection volume,
injection ratio, number of injection and spray condition.
Accelerator sensor Unlike mechanical governors, the common rail fuel injection system has no governor lever.
The accelerator sensor serves as the governor lever to provide the speed command signal
(voltage signal) to the ECU for engine speed control.
Engine diagnosis tool Allows the operator to troubleshoot the cause of a problem based on detailed information
regarding the problem occurring in the ECU. This tool can also be used for data maintenance
tasks including programming and mapping. See TROUBLESHOOTING on page 135.
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