Iveco Daily Euro 4. Manual — part 79

105067

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.

The control unit is of the ”flash EPROM” type, i.e. it can be
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.

ELECTRIC/ELECTRONIC COMPONENTS
766161

Electronic control unit EDC 16

Figure 347

k

85711

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.

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SENSORS
764266

Engine speed sensor

It is an inductive sensor and is positioned on the phonic wheel
fitted on the front end of the drive shaft
It generates the signals resulting from the magnetic flow lines
which close through the teeth of the phonic wheel.
Tooth number 58.
The electronic control unit uses this signal to measure the
speed of rotation of the engine, its angular position and to
operate the electronic rev counter.
If this signal fails the rev counter will not work.

764264

Camshaft timing sensor

It is an inductive sensor and is positioned on the camshaft gear
of the suction valves.
It generates the signals resulting from the magnetic flow lines
which close through a slot on the gear itself.
The signal generated by this sensor is used by the electronic
control unit as a redundant signal to measure the different
engine speeds.

Figure 348

761917

Glow plug electronic control unit

During the phases below:
- starting phase,
- post-starting phase,
the engine management control unit will time the plug
preheating control unit operation depending on the engine
temperature.
The plugs will be triggered through the plug preheating control
unit, depending on the engine temperature, under direct
control of the engine management control unit.
The preheating control unit incorporates a ”smart”
remote-control switch that sends a return response
(”feed-back”) to the management control unit: the latter will
therefore be informed about the preheating control unit
failure (if any) or the plug short-circuit to the ground.

75578

761915

Glow plugs

Figure 349

75579

CONTROL VALUES

With a constant supply voltage of 11 V:

- max. current drawn

18 A

- min 5 sec.

11

±1.5 A

- in 30 sec.

6

±0.9 A

- temperature after 7 sec.

850

°C

- tightening torque

8-10 Nm

88056

Figure 350

The sensor gap shall be as follows:

- 1 + 0.5 mm, between distributing shaft pulley (4) and

phase sensor (1);

- 1 mm, between phonic wheel (2) and revs sensor (1).

SENSOR ASSEMBLING DIAGRAM

F1C ENGINE

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772655

Air temperature and pressure sensor

Positioned on the intake manifold, it measures the pressure of
the turbocharging air introduced into the intake manifold.
This value, together with that of the air temperature sensor,
makes it possible for the electronic control unit to calculate the
exact quantity of air introduced into the cylinders so as to
operate the injectors adjusting the fuel delivery, limiting
harmful emissions, improving consumption and performance.
The sensor contains an electronic temperature correction
circuit to optimize the pressure measurement in relation to the
temperature of the intake air.

772656

Fuel temperature sensor

Integrated in the fuel filter, it measures the fuel temperature
and transmits it to the electronic control unit.
When the fuel temperature is too high (ambient temperature
condition, engine at full load and tank in reserve), correct
lubrication of the high-pressure pump is no longer assured. On
the basis of the values received, the control unit determines the
density and volume of the fuel, correcting the delivery limiting
engine performance.

774511

Fuel pressure sensor

It is fitted on the hydraulic accumulator end (rail) and its
function is to transmit a “feed-back” signal to the injection
control unit for:

- adjust injection pressure
- adjust the duration of injection.

772641

Clutch pedal position sensor

Mounted on the pedal board, it provides the control unit with
a positive signal when the clutch is engaged (pedal released).
Every time the clutch is disengaged to change gear, the control
unit fails to receive this signal and deactivates the Cruise
Control function.

772642

Brake pedal position sensor

There are two of these sensors mounted on the pedal board.
With the brake pedal released, they provide the control unit
with a positive signal that is used to detect brake operation so
as to deactivate the Cruise Control function and stop delivery
of fuel.
In addition, a sensor switches on the brake lights.

764261

Vehicle speed sensor

This sensor, mounted on the gearbox by the drive output
shaft, transmits the vehicle speed signal, through the electronic
tachograph, to the control unit.

540743

Differential pressure sensor - delta p
(Dp)

This sensor detects the difference between the pressure (Dp)
of the incoming exhaust gas and the pressure of the gas flowing
out of the D.P.F. catalyst.
The measured value indicates the extent of particulate (PM)
particle accumulation or clogging in the D.P.F. filter.
This value will, through a proper signal (feed-back), be
processed by the EDC control unit 16, which will cause
post-injection so as to increase the exhaust gas temperature
(630˚-650˚C) and also cause the particulate particles
accumulated in the D.P.F. filter to be burned.

766161

Atmospheric pressure sensor

This is integrated in the electronic control unit. It provides a
criterion of correction for the measurement of the air flow
rate and to calculate the reference air flow rate to check the
EGR.

764254

Engine coolant temperature sensor

This provides the control unit with an index of the thermal
status of the engine in order to determine corrections for the
fuel delivery, injection pressure, EGR injection advance when
starting cold (if mounted) and warm-up.

505910

Throttle pedal position sensor

The accelerator pedal position sensor provides the control
unit with a voltage value in proportion to the angle of
operation of the pedal determining fuel delivery.

In case of replacement, the control unit shall be
programmed again by means of the IVECO
MODUS - E.A.SY. - IT 2000 diagnosis instrument, by
performing the replacement procedure indicated
by the diagnosis instrument itself.

NOTE

In case of replacement, the control unit shall be
programmed again by means of the IVECO
MODUS - E.A.SY. - IT 2000 diagnosis instrument, by
performing the replacement procedure indicated
by the diagnosis instrument itself.

NOTE

Exhaust gas temperature sensor

The D.P.F. catalyst includes two temperature sensors located
at the D.P.F. catalyst inlet and outlet, respectively.
The temperature values are processed by the control unit to
determine post-combustion, in order to increase the exhaust
gas temperature needed to burn the particulate particles.

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