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308
F1C ENGINE
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Figure 346
Conversion table of OCR
characters into ARIEL characters
At assistance, code written in clear has to be used (3, Figure 31)
for central unit replacement and reprogramming procedures.
In the table there is shown the conversion of OCR characters into
Ariel characters.
When electrical injectors mounted on the vehicle must be
replaced, meet following warnings:
- where electrical injectors are dismounted and do not
need to be replaced, their mounting position has to be
noted down in order to remount them later in the same
position; this is done to avoid to reprogram the central
unit;
- after replacing one or more injectors, the central unit has
to be reprogrammed;
- before mounting a new electrical injector, note down IMA
code printed on the injector, because the code is difficult
to read after the injector has been mounted;
- where the central unit is replaced, reprogram the new
central unit with the IMA codes of the electrical injectors
mounted on the engine and copy down the rectification
coefficients (ZFC) of replaced central unit; where it is not
possible, they must be reset and self-learning process
must be started up again.
During engine running, EDC 16 central unit performs some
checks on electrical injectors minimum flow rate.
In certain conditions (overrun: vehicle deceleration with pedal
released) an increasing (very small) fuel quantity starting from
zero is injected and its effect on engine rotation smoothness
is observed.
Injection start threshold is detected and stored by the central
unit.
This self-learning process is carried out on each single cylinder.
Therefore, replacing an electrical injector involves the need of
reprogramming the central unit by entering the IMA codes of
new electrical injectors and resetting the rectification factors
(ZFC) of the cylinder considered.
Replacing all electrical injectors extends the need of resetting
to all the rectification coefficients (ZFC) of each single
electrical injector.
Base - March 2006
The correction coefficients (ZFC) can be set to zero by means
of the IVECO MODUS - E.A.SY. - IT 2000 diagnosis
instruments, by programming the control unit again and
performing the replacement procedure indicated by the
instrument itself.
ELECTRIC/ELECTRONIC COMPONENTS
766161
Electronic control unit EDC 16
Figure 347
The control unit is of the "flash EPROM" type, i.e. it can be
105067
reprogrammed from the outside without acting on its
hardware.
The control unit processes the signals from the sensors by
applying software algorithms, and also controls the actuators
(in particular, the electric injectors and the pressure regulator).
The control unit records, in the memory non-labile area, the
information on the engine parameters originally set or
acquired during engine operation.
The injection control unit incorporates the absolute pressure
sensor, in order to further improve the injection system
control.
The control unit is fitted to the left side of the engine
compartment and is connected to the vehicle wiring by means
of two connectors:
- 60-pole connector "A" for the components available on the
engine;
- 94-pole connector "K" for the components on the vehicle.
In addition to controlling the system functions described in the
respective charter, the electronic control unit is interfaced
with the other electronic systems found on the vehicle, such
as ABS - EBD, cruise control, speed limiter, immobilizer
(IVECO CODE), EGR, preheating plugs.
On the vehicles equipped with D.P.F. catalyst, the control unit
also controls the catalyst regeneration system. In this case,
after any of the operations below is carried out:
- replacing one or several injectors,
- replacing all the injectors,
- replacing the air flow meter,
- replacing the hydraulic accumulator pressure sensor
(common rail),
- replacing the EDC control unit 16;
- changing the engine oil,
- replacing the D.P.F. catalyst,
- replacing the filter differential pressure (Dp) sensor,
- replacing any significant component as regards emission
levels,
- performing forced regeneration,
the control unit shall be programmed again by means of the
IVECO MODUS - E.A.SY. - IT 2000 diagnosis instrument, and
the replacement procedure for the concerned component
shall be performed, in accordance with the indications of the
diagnosis instruments.
D
AILY
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Print 603.93.651
E
4
URO
85711
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