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
3JH40_4JH45_4JH57_4JH80_4JH110_EN_OPM.book 19 ページ 2022年9月22日 木曜日 午後6時17分