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.