ARIA

ENGINE 130 E. INJECTOR The injector used in Varicor engine is a solenoid op- erated injector. This is controlled by the EMS ECU. The timing of injection and quantity is controlled by the EMS ECU. It operates at a pressure of 1600 bar. It makes multiple injections ( 2 pilot injections and 1 main injection) with short intervals between each injection. The injector has a unique 20 digit hexadecimal I3C code by which the EMS ECU recognizes it. Whenev- er an injector is replaced, it should be re-calibrated using the Diagnostic tool by entering the I3C code. For procedure refer EMS ECU Diagnostic software users’ manual in this group. NOTE Injectors should not to be interchanged in during ser- vice since individual injector characterization is different and I3C no. of each injector is written in the ECU during engine assembly. F. HIGH PRESSURE PUMP (H.P. PUMP) HP pumps draws fuel from the fuel tank through the water Sedimentor and the fuel filter. It supplies high pressure fuel (up to 1600 bar) to the injectors. It has got inlet metering valve and in-built feed pump, inte- grated pressure limiter and integrated fuel temperature sensor. This pump is driven by the en- gine timing belt and controlled by EMS ECU based on the various operating parameters. FUEL TEMPERATURE SENSOR ( FTS ) This sensor monitors the temperature of fuel entering into the HP pump. It measures the fuel temperature on the pump hydraulic head in the low pressure cir- cuit, between the transfer pump outlet and the inlet to the HP pumping stage. This sensor information is used to modify rail pressure control, injection etc. This sensor is in-built with HP Pump. INLET METERING VALVE ( IMV) This controls fuel flow into pumping element in order to control rail pressure. This sensor is in-built with HP Pump. VENTURI It is an integral part of High pressure pump. It has inlet and outlet connections. One connection comes from injector back leak circuit & the other connection goes to the fuel tank ( return Line ), in between there is a "T" connector which goes to the fuel filter.