Replacing The Electric Injectors - Iveco daily euro 4 Repair Manual

D E 4
AILY URO
755010

REPLACING THE ELECTRIC INJECTORS

Figure 9
1. IMA Matrix code- 2. Bosch spare part no. -
3. IMA code in clear - 4. Iveco spare part no. - 5. Code -
6. Series no. - 7. Production date
Electrical injectors are not assigned any more to classes Min (01)
- Med (02) - Max (03); therefore, flow rate deviations from
design values are detected, during final check step, by the
manufacturer on each single injector and printed with I.M.A.
(Injector Menge Abgleichung) [Injector Quantity Offset] code
on injector magnet.
At engine production plant, I.M.A. code is read on line from an
automatic reading station, converted into bar code, printed on
engine identification label and applied on the engine itself.
At vehicles production plant, at line end, E.D.C. 16 central unit
is programmed automatically reading the engine identification
label.
Figure 10
Conversion table of OCR
characters into ARIAL characters
At assistance, code written in clear has to be used (3, Figure 9)
for central unit replacement and reprogramming procedures.
In the table there is shown the conversion of OCR characters
into Arial characters.
Print 603.93.651
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.
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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.
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17
F1A ENGINE
Base - March 2006