Fuel Supply; High Pressure Electronic Injection System (Ms 6.3 - Edc 16) - Iveco daily euro 4 Repair Manual

D E 4
AILY URO
Print 603.93.281

FUEL SUPPLY

HIGH-PRESSURE ELECTRONIC
INJECTION SYSTEM (MS 6.3 - EDC 16)
General
Common Rail MS6.3 is a high-pressure electronic injection
system for fast diesel engines with direct injection.
Its main features comprise:
- high injection pressures available (1600 bar);
- these pressures can be modulated between 250 bar up
to the maximum operating pressure of 1600 bar,
irrespective of the speed of rotation and engine load;
- capacity to operate at very high speeds (up to 6000
rpm);
- injection control precision (injection duration and
advance);
- lower consumption;
- lower emissions.
The main functions of the system are basically as follows:
- checking fuel temperature;
- checking engine coolant temperature;
- checking amount of fuel injected;
- checking idling speed;
- cutting off fuel in release phase;
- checking cylinder balancing when idling;
- checking anti-sawing;
- checking smokiness at exhaust on acceleration;
- checking exhaust gas recirculation (E.G.R.);
- checking top speed limit;
- checking glow plugs;
- checking activation of air-conditioning system (if any);
- checking auxiliary fuel pump;
- checking position of cylinders;
- checking main and pilot injection advance;
- checking closed cycle of injection pressure;
- checking turbocharging pressure;
- self-diagnosis;
- connection with immobilizer unit;
- checking maximum torque limitation.
The system makes pre-injection (pilot injection) possible
before the TDC with the advantage of decreasing the
derivative of the pressure in the combustion chamber,
lowering the noise level of combustion, which is typical of
direct injection engines.
The control unit checks the amount of fuel injected,
adjusting the line pressure and injection times.
The information the control unit processes to regulate the
amount of fuel to be injected comprises:
- engine speed;
- coolant temperature;
- turbocharging pressure;
- air temperature;
- intake air quantity;
- battery voltage;
- diesel pressure;
- position of throttle pedal.
Print 603.93.651
F1A ENGINE
Figure 283
high pressure
low pressure
1. Timing phase sensor - 2. Electric injectors - 3. Preheating plug - 4. Coolant temperature sensor - 5. Electromagnetic fan - 6. E.G.R. valve modulator - 7. Engine revs sensor - 8. Compressor (if any) -
9. High-pressure pump - 10. Connector for fuel temperature sensor, heater and fuel filter clogging sensor (on request) - 11. Pressure regulator - 12. Fuel filter - 13. Fuel tank - 14. Fuel gauge with built-in electric
fuel pump - 15. Control unit with atmospheric pressure sensor - 16. Battery - 17. Accelerator pedal sensor - 18. Clutch pedal sensors - 19. Brake pedal sensors - 20. Low-pressure fuel pipes - 21. Throttle valve
assembly - 22. Hydraulic accumulator (rail) air pressure/temperature sensor - 23. Air pressure/temperature sensor - 24. Hydraulic accumulator - 25. Engine revs counter - 26. Display - 27. Tachograph.
Base - March 2006
137
HIGH-PRESSURE ELECTRONIC INJECTION SYSTEM COMPONENTS LAYOUT
108203