Nissan Note [1612/1872] Ec 1612

Nissan Note [1612/1872] Ec 1612
EC-1612
[K9K]
ENGINE CONTROL SYSTEM
System Overview
BBS004TJ
The DCM1.2 injection system used on the K9K engine is an electronically-controlled high-pressure injection
system. The fuel is compressed by a high-pressure pump and then stored in a fuel rail that feeds the fuel injec-
tors. Injection takes place when a current pulse applied to the fuel injector holder. The injection delivery is pro-
portional to the fuel rail pressure and the length of pulse applied, and the start of injection is synchronised with
the start of the pulse.
The circuit comprises two sub-systems that can be distinguished from one another by the pressure level of the
fuel:
The low-pressure circuit comprises the reservoir, the fuel filter, the transfer pump and the fuel injector
holder return pipes
The high-pressure circuit consists of the high-pressure pump, the fuel rail, the fuel injector holders and the
high-pressure tubes
Finally, there are a certain number of regulation sensors and actuators that allow command and control of the
systemasawhole.
Fuel Injection Control
BBS004TL
The high pressure injection system is intended to deliver a specific quantity of fuel to the engine at a specific
time.
DELPHI DCM1.2 Common Rail injection system
Refer to EC-1609, "
System Diagram" for details.
The system consists of:
Priming pump on the low pressure circuit
Fuel filter
High pressure pump incorporating a low pressure pump (transfer pump)
Flow actuator (fuel pressure regulator) attached to the fuel pump
Fuel rail
Fuel rail pressure sensor located in the fuel rail
Four fuel injectors
Fuel pump temperature sensor
Engine coolant temperature sensor
Intake air temperature sensor
Camshaft position sensor (cylinder reference sensor)
Turbocharger boost sensor
Knock sensor
EGR volume control valve
Accelerator pedal position sensor
ECM
The common rail” direct high pressure injection system works sequentially.
This new injection system reduces operating noise, reduces the volume of pollutant gases and particles
and produces high engine torque at low engine speeds thanks to a pre-injection procedure.
The high pressure pump generates the high pressure sent to the fuel rail. The flow actuator on the pump
controls the quantity of fuel supplied according to the demand determined by the ECM. The fuel rail sup-
plies each fuel injector through a steel pipe.
The ECM:
Determines the value of injection pressure necessary for the engine to operate well and then controls the
pressure regulator. It checks that the pressure value is correct by analyzing the value transmitted by the
fuel rail pressure sensor located on the fuel rail.
Determines the injection time necessary to deliver the right quantity of fuel and the moment when injection
should be started.
Controls each fuel injector electrically and individually after determining these two values.
The injected flow to the engine is determined by:
The duration of fuel injector control

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