PRODUCT OVERVIEW18 JH Series Operation ManualMAIN ELECTRONIC CONTROL COMPONENTS ANDFEATURESComponent/feature DescriptionController By controlling the fuel injection timing, volume, pressure and number in accordance with thetarget speed indication entered from the accelerator sensor, the controller adjusts the enginespeed 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 anddistributes fuel to the injector in each cylinder.Fuel injector The Fuel Injectors the high-pressure fuel from the rail to the engine combustion room afterreceiving a signal from the ECU in the most appropriate injection timing, injection volume,injection ratio, number of injection and spray condition.Accelerator sensor(Installed in the ECU box)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 informationregarding the problem occurring in the ECU. This tool can also be used for data maintenancetasks including programming and mapping. See Troubleshooting on page 81
