Iveco Daily Euro 4. Manual — part 254
100
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
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4
When the engine control centre pilots the pressure
regulator via the PWM signal, solenoid (1) is activated, which
in its turn generates movement of magnetic core (2).
Core movement causes cylinder (3) axial displacement by
fuel delivery partialization.
When solenoid (1) is not activated, the magnetic core is
moved to its rest position by preload spring (6).
In these conditions, cylinder (3) is in a position to offer
maximum fuel passage cross-section.
Control electro valve 78013 is connected to centre
connector A pins 19 and 49.
1. Solenoid - 2. Magnetic core - 3. Cylinder - 4. Fuel input - 5. Fuel output - 6. Preloiad spring - 7. Connector
7
5
4
1
2
3
4
5
1
2
6
3
6
Figure 83
003386t
75574
75575
ELECTRIC/ELECTRONIC SYSTEM
101
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The hydraulic accumulator is mounted in the cylinder head
on the side opposite aspiration.
By its volume, it damps fuel pressure oscillations owing to:
- high-pressure pump operation
- electro injector opening.
On hydraulic accumulator there is located the fuel pressure
sensor.
Pressure sensor
Fitted to a rail end, it measures fuel pressure present to the purpose of determining existing fuel pressure. Pressure value is used
to control pressure and determine injection electric control duration (85157).
It is connected to the central unit at pins A 8/43/28. It is fed at 5 V.
1. Rail - 2. Pressure sensor
PRESSURE LIMITER OPERATING GRAPH
1500 bar
0 bar
0.2V
0.5V
4.5V
4.8V
Minimum
1500 bar
0 bar
0.2V
4.8V
VOLTAGE
PRESSURE
Figure 84
Figure 85
88418
102
ELECTRIC/ELECTRONIC SYSTEM
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This component incorporates a temperature sensor and a
pressure sensor (85156).
It is fitted on the engine intake manifold and measures the
maximum flow rate of the intake air which is used to
accurately calculate the amount of fuel to be injected at each
cycle.
It is connected to the central unit on connector ”A”.
Pin 1 sensor - Pin A23
-
earth -
Pin 2 sensor - Pin A53
-
temperature signal
Pin 3 sensor - Pin A13
-
5V - supply -
Pin 4 sensor - Pin A40
-
0
÷ 5V
pressure signal
Course of sensor in relation to the temperature
Temperature
Resistance
- 40
°C
48.50 kOhm
- 20
°C
15.67 kOhm
0
°C
5.86 kOhm
20
°C
2.50 kOhm
40
°C
1.17 kOhm
60
°C
0.59 kOhm
80
°C
0.32 kOhm
100
°C
0.18 kOhm
120
°C
0.11 kOhm
Course of sensor in relation to the pressure:
See graph opposite.
AIR FLOW METER
AIR FLOW METER CONNECTION
2.5 bar
0.2 bar
0.4V
4.65V
VOLTAGE
ABSOLUTE PRESSURE
AIR FLOW METER OPERATING GRAPH
Figure 86
Figure 87
Figure 88
8660
ELECTRIC/ELECTRONIC SYSTEM
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This is integrated inside the control unit.
It measures the atmospheric pressure to correct the flow rate
in relation to the altitude.
Engine coolant temperature sensor
This is an NTC sensor located on the thermostat box.
It detects the temperature of the coolant fluid to give the
control unit information about the engine temperature
conditions.
The same signal is used (via CAN lines) to control the
instrument cluster where the gauge is present.
Fuel temperature sensor
This is an NTC sensor located on the fuel filter.
It detects the temperature of the fuel to give the control unit
information about the fuel oil temperature conditions.
It is connected to pins 52 and 51 of connector A of the control
unit.
COURSE OF SENSOR RESISTANCE IN RELATION TO
TEMPERATURE
TECHNICAL VIEW OF ENGINE COOLANT
TEMPERATURE SENSOR
WIRING DIAGRAM
NTC
A. Temperature sensor
Figure 89
Figure 91
107689
Figure 90
Figure 92
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