Iveco Daily. Manual — part 415
186
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
Figure 201
88264
88267
Timing sensor (stroke)
ELECTRIC/ELECTRONIC SYSTEM
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D
AILY
RPM sensor
A phonic wheel is fitted on the drive shaft. As the sensor
detects existing teeth passing, it provides the central unit with
the signal that is necessary to determine engine r.p.m.'s.
The variation of the signal generated by the lack of some teeth
(synchronisation gap) occurring at each drive shaft turn is the
reference signal which enables the central unit to detect the
lead of the pair of pistons 1-4 with respect to PMS.
This signal is also used by the control unit to detect the engine
rotation speed, the duration of injection and to control the
rev counter.
Phonic wheel mounting
1. Phonic wheel
TECHNICAL VIEW OF THE SOUND WHEEL AND
SENSOR
1. Sound wheel - 2. Sensor
Figure 202
Figure 203
Figure 204
0003319t
87792
87793
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ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
These are inductive sensors.
The flywheel sensor (48035) is connected at pins 27 and 12
of connector A of the control unit.
Timing sensor
A semiconductor layer, immersed in a magnetic field and
through which current flows, generates a potential difference
(called Hall voltage) at its ends.
If current intensity remains constant, the generated voltage
depends only on the magnetic field strength: periodical
variation of field strength is enough to obtain a modulated
electric signal.
The smooth portion of the phonic wheel (distributing shaft
pulley) covers, while moving, the sensor, thus blocking the
magnetic field with resulting low output signal.
On the contrary, the sensor generates a high signal next to
the openings and when a magnetic field is available.
Phase sensor signals are acquired, and the engine position is
recognized according to the sequence of the phonic wheel
notches.
The mounting function makes it possible to identify signal
errors and interferences (if any).
The resulting signal is supplied to the processor that controls
the injection system.
The sensor (48042) is connected to the central unit at pins
A20/50/11.
RPM SENSOR AND CONNECTION CABLE
SENSOR CONNECTOR AND WIRING DIRAGRAM
TIMING SENSOR
1. Earth - 2. Signal output - 3. Power supply positive
Figure 205
Figure 206
Figure 207
3
1
2
85712
ELECTRIC/ELECTRONIC SYSTEM
189
D
AILY
High-pressure pump
Pressure delivered to the rail is modulated between 250 and
1600 bars by the electronic central unit by operating on the
solenoid valve of pressure regulator.
Pump (3) is oriented on the pump shaft cam.
During aspiration the pump is powered via supply conduit
(5).
The amount of fuel to be sent to the pump is set by pressure
regulator (7).
The pressure regulator stops fuel inflow to the pump based
on PWM input from the centre.
During pump compression, fuel reaches a pressure level
sufficient to open the pressure valve to common rail (2), and
supplies it via output (1).
1. Output for rail pressure - 2. Rail pressure valve - 3. Pump - 4. Pump shaft - 5. Pump supply conduit - 6. Pressure
regulator supply conduit - 7. Pressure regulator - 8. High pressure pump - 9. Fuel input connection from filter - 10. Fuel
output connection to filter support - 11. Fuel input connection from centre heat exchanger - 12. Fuel output connection
from mechanical pump to filter - 13. Supply mehanical pump
Figure 208
88072
A
B
C
B–B
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