SYSTEM / ECM System Fuel Injection Pressure Control Purpose: Controls fuel pressure in the common rail in order to control fuel injection pressure. Operation: 1. ECM calculates fuel injection amount according to the engine speed and the signals from MC by using CAN communication. (Refer to the page on Fuel Injection Amount Control.) 2. The common rail pressure sensor sends the sig- nals according to pressure in the common rail to ECM. 3. ECM calculates the best fuel pressure in common rail according to the engine speed, fuel injection amount and the signals of common rail pressure. 4.
ECM drives the suction control valve in supply pump and supplies the best pressure of fuel to the common rail. 5. Fuel according to fuel pressure in the common rail is supplied to the injector from the common rail. T2-3-6