Engines Iveco N45, N67. Manual — part 17
Fuel temperature and pressure sensor
Mounted on one end of the rail, this sensor measures the internal fuel pressure and informs the control unit of the value (feedback).
The injection pressure value is used as a pressure control feedback signal and to determine the duration of the electrical injection
command.
This sensor is connected to the control unit on pins 12C - 14C- 13C.
The power supply is 5 Volt.
Figure 102
Fuel pressure sensor connector
0051065t
SECTION 3 - DUTY-INDUSTRIAL APPLICATION
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F4HE NEF ENGINES
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Ref.
Description
ECU pin
1
Ground
12C
2
Signal
14C
3
Power supply
13C
Electro-injectors
The electro-injectors are effectively N.O. solenoid valves.
Each injector is connected to the EDC control unit on connector A.
The impedance of the coil of each injector is 0.56 - 0.57
Ω.
Figure 103
50343
50349
Figure 104
40
SECTION 3 - DUTY-INDUSTRIAL APPLICATION
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
Ref.
Description
ECU pin
CONNECTOR 1
1
2
3
4
Cylinder 2 injector
Cylinder 2 injector
Cylinder 1 injector
Cylinder 1 injector
11 A
6 A
13 A
4 A
CONNECTOR 2
1
2
3
4
Cylinder 4 injector
Cylinder 4 injector
Cylinder 3 injector
Cylinder 3 injector
14 A
3 A
12 A
5 A
CONNECTOR 3
1
2
3
4
Cylinder 6 injector
Cylinder 6 injector
Cylinder 5 injector
Cylinder 5 injector
15 A
2 A
1 A
16 A
Pre-post heating resistance and contactor
The pre-post heating resistance is located on the intake manifold.
The resistance serves to heat the air in pre / post heating operations. This resistance is powered by a contactor on the left hand
side of the chassis.
The resistance impedance is approximately 0.5
Ω.
Figure 105
Figure 106
003215t
Resistance
002371t
A. Control contactor
The control contactor is connected to the control unit B connector.
The contactor is tripped with water and/or fuel temperature below 5
°C.
The contactor impedance is approximately 15
Ω.
!
SECTION 3 - DUTY-INDUSTRIAL APPLICATION
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F4HE NEF ENGINES
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Coolant temperature sensor
This is a variable resistance sensor able to read the coolant temperature in order to provide the control unit with an indication
of the thermal status of the engine.
The same signal is utilized by the control unit to drive an instrument panel gauge, if present.
This sensor is connected to the control unit on pins 15C - 26C.
The impedance of the coolant temperature sensor at 20
°C is approximately 2.50 Ω.
Figure 107
107471
42
SECTION 3 - DUTY-INDUSTRIAL APPLICATION
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
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