Nissan Note [1615/1872] Ec 1615

Nissan Note [1615/1872] Ec 1615
ENGINE CONTROL SYSTEM
EC-1615
[K9K]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Gear ratio selected
Battery charge
Whether electrical loads (additional heating, climate control, engine ventilator set, rear window defogger,
etc.) are on or off
System malfunctions detected
INDIVIDUAL FUEL INJECTOR CORRECTION
The fuel injectors of the DCM1.2 system must be calibrated with fuel injector adjusting values in order to accu-
rately set their delivery. Calibration of each fuel injector is performed for various pressures on a test bed and
the characteristics are shown on a label attached to the fuel injector holder body. These fuel injector adjusting
values are then entered in the ECM memory thereby allowing it to operate the fuel injectors taking into account
their manufacturing variance.
MEASUREMENT OF THE ANGULAR POSITION
Crankshaft position sensor (CKPS):
Measurement of the angular position is performed by means of a magneto-inductive sensor that is excited by
machined into the flywheel of the crankshaft. This flywheel comprises sixty teeth with a spacing of six degrees,
less two missing teeth to form a notch.
Camshaft position sensor (CMPS):
A second sensor (Hall effect) excited by a tooth machined in the drive pulley of the high-pressure pump (in
synch with the camshaft), rotates at half the speed of the engine and provides information on the operation of
the injection cycle.
By comparing the signals from these two sensors, the angular position subsystem (APS) of the ECM is capa-
ble of providing the system as a whole with the following synchronisation information: the angular position of
the flywheel, the speed, the number of the active fuel injector and the advance in the injection cycle.
This module also provides the system with information on the speed of rotation.
NEW PUMP HOUSING FUEL FLOW STRATEGY (PUMP FUEL FLOW)
Lubrication of the pump is by means of a fuel flow cycle during which the pump is filled and comes up to pres-
sure before transferring the fuel to the fuel rail.
This lubrication is performed using a strategy known as “new pump housing fuel flow” which prevents starting
for around 10 seconds, which is the time needed for filling of the pump and starting.
For vehicles equipped with keys, if the key is released before this “first start-up” phase it is not necessary to
perform a power latch before proceeding to restart the vehicle.
This strategy applies following an initial start-up in the factory and then whenever there is a change of ECM if
the fuel rail pressure parameters are not copied over to the new ECM, or also following reprogramming of the
ECM.
VARIABLE LOW CAPACITY (VLC) FUNCTION
Due to the combination of a number of parameters such as the temperature of the fuel, wear of parts, clogging
ofthefuelfilter,andsoon,thesystems limit may be reached during its lifetime. In this case, the pressure in
the fuel rail cannot be maintained because of a lack of capacity of the pump. In the event of a lack of pump
capacity, therefore, this strategy will reduce the delivery required to a value that allows the pressure controller
to re-check the pressure.
EGR VOLUME CONTROL VALVE OPERATION
The EGR system (exhaust gas recirculation) is comprised a direct current proportional EGR volume control
valve with integral potentiometer to read the position of the valve. The EGR volume control position is con-
trolled in a closed circuit via the potentiometer and/or the change in the estimated air deliver
AIR DELIVERY CALCULATION
The delivery of fresh air that enters the engine is indicated by a mass air flow sensor. This mass air flow sen-
sor allows management of the quantity of exhaust gas to be recirculated in order to guarantee the best recircu-
lation rates. An intake air temperature sensor is incorporated in the mass air flow sensor.
Measurement of the air delivery allows closed-circuit control via the EGR volume control valve.
TURBO CONTROL
K9K 63kw Engine:
The turbo system is comprised a solenoid valve that allows control of the waste gate in order to create a boost
pressure or a depression in the admission circuit.

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