Main Electronic Control Components And Features - Yanmar 4JH45 Operation Manual

PRODUCT OVERVIEW
MAIN ELECTRONIC CONTROL COMPONENTS AND
FEATURES
Component/feature
Controller
Fuel pump (supply pump)
Common rail
Fuel injector
Accelerator sensor
(Installed in the ECU box)
Engine diagnosis tool
18
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.
The fuel pump supplies fuel to the common rail.
The common rail stores the compressed high-pressure fuel from the supply pump and
distributes fuel to the injector in each cylinder.
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.
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.
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 81
Description
JH Series Operation Manual