Iveco Daily. Manual — part 408

160

ELECTRIC/ELECTRONIC SYSTEM

D

AILY

Base - May 2004

known.

The designer has therefore included special instructions in

the control unit to avoid it.

De-rating
In the event of the engine overheating, injection is modified,

decreasing the delivery to a varying degree, in proportion to

the temperature reached by the coolant.

Turbine rpm setting (.15 - .17)

(for the variable geometry turbo-compressor)
By changing its geometry, adjusted turbine speed is

monitored by the electronic centre via an electrical signal

feeding the compressed air actuator electro valve. Based on

signals from the accelerator pedal position and suction

manifold air temperature/pressure engine rpm sensors, the

electronic centre processes the field-back signal to properly

modulate turbine actuator pilot electro valve opening.

Injection timing electronic test
The advance (start of delivery, expressed in degrees) may be

different from one injection to the next, also differentiated

from one cylinder to another. It is calculated, similarly to the

delivery, in relation to the engine load (accelerator position,

engine speed and air introduced).

The advance is appropriately corrected:
- in phases of acceleration;
- according to the water temperature.
And also to obtain:
- lower emissions, noise and overloading;
- better vehicle acceleration.
An extremely high advance is set on starting, depending on

the water temperature.

Feedback from the start of delivery is supplied by the change

in impedance of the injector solenoid valve.

Speed governor
The electronic speed governor has both features of

governors:
- idling and top speed
- all speeds
It is stable in ranges where conventional, mechanical

governors are imprecise.

Engine starting
During the first few turns of the engine, the timing and

cylinder no. 1 recognition signals (flywheel sensor and

camshaft sensor) are synchronized.

The accelerator pedal signal is ignored on starting. Starting

delivery is set only according to water temperature, by a

special map.

When the control unit detects such speed and acceleration

of the flywheel as to be able to consider the engine started

up and no longer driven by the starter motor, it re-enables

the accelerator pedal.

Cold starting
If even just one of the three temperature sensors (water, air

or diesel) records a temperature lower than 10°C, pre-post

heating is activated.

On inserting the key contact, the pre-heating indicator goes

on and remains on for a period varying depending on

temperature (air is heated by the pre-heating glow plugs that

are located on cylinder head for F1 engines), then it blinks.

Thereafter, the engine can be started up.

When the motor is running this indicator light goes out, while

the glow plugs continue to be powered for a certain length

of time (variable) for post-heating.

If, with the indicator light flashing, the engine is not started

up within 20-25 seconds (inattention time), the operation

is cancelled so as not to run down the batteries pointlessly.

The pre-heating curve is also variable in relation to the

battery voltage.

Warm starting
If the reference temperatures all exceed 10°C, when the key

makes contact the indicator light comes on for

approximately 2 sec., for a short test, and then goes out. It

is now possible to start up the engine.

Run up
When the key makes contact, the control unit transfers the

information stored in memory when the engine was last

stopped into the main memory (see After Run) and makes

a diagnosis of the system.

After run
Whenever the engine is switched off with the key, the

control unit stays powered for a few seconds by the main

relay.

This makes it possible for the microprocessor to transfer

some data from the main memory (volatile) to a non-volatile

memory, which can be erased and written over (EEPROM),

so as to make it available at the next start up (see Run Up).

ELECTRIC/ELECTRONIC SYSTEM

161

D

AILY

!

It is extremely important for this procedure not to be

broken off, for example by switching off the engine with

the battery cut-out, or by disconnecting the battery

cut-out before 10 seconds have passed since switching

off the engine.

If this happens, the functioning of the system is ensured,

but repeated interruptions may damage the control

unit.

These data basically consist of:
- various settings (engine idling adjustment, etc.);
- settings of some components;
- fault memory.
The process lasts a few seconds, typically from 2 to 7

(depending on the amount of data to save), after which the

ECU sends a command to the main relay and makes it

disconnect from the battery.

Cut - off
This function cuts off fuel delivery when the vehicle is

decelerating (accelerator pedal released).

Cylider balancing
Individual cylinder balancing contributes to increasing

comfort and handling.

This function permits individual, customized control over the

delivery of fuel and the start of delivery for each cylinder,

even differently from one cylinder to another, to

compensate for the hydraulic tolerances of the injector.
The differences in flow (delivery specifications) between the

various injectors cannot be evaluated directly by the control

unit. This information is supplied by Modus reading the bar

code of each injector at the time of assembly.

Synchronisation search
If there is no signal from the camshaft sensor, the control unit

is anyhow able to recognize the cylinders into which the fuel

is to be injected.

If this occurs when the engine is already running, the

combustion sequence has already been acquired, so the

control unit continues with the sequence on which it has

already been synchronized.

If this occurs when the machine is at a standstill, the control

unit energizes a single solenoid valve. Within at most 2 turns

of the crankshaft, injection will take place in that cylinder, so

the control unit just needs to get synchronized on the firing

sequence and to start up the engine.

162

ELECTRIC/ELECTRONIC SYSTEM

D

AILY

Base - May 2004

PERSPECTIVE VIEW

A. Housing for injection cable connector - B. Seat for cabin-bonnet cable (UNIJET motor drive)

LOCATION ON THE VEHICLE

85150

B

A

Figure 178

Figure 179

7420

7406

ELECTRIC/ELECTRONIC SYSTEM

163

D

AILY

Control unit connection to the injection cable on engine side (housing A)

Pin

Function

Cable

colour code

1

To engine coolant temperature sensor

5154

2

To turbo-blower air pressure and temperature sensor for EDC (without EGR)

5151

3

To turbo-blower air pressure and temperature sensor for EDC (without EGR)

5153

4

To engine rpm sensor on camshaft (cams)

White

5

To temperature sensor and ambient air pressure for EDC (with EGR)

5151

6

Fuel pressure adjustment sensor earth

0000

7

Control to relay for switching on fuel pump

8150

8

Common EDC centre mass ć Centre monitored remote control switches - EGR electro valve

0000

9

To solenoid valve for pressure adjustment

9925

10

To solenoid valve for electronic injection (injector 2 - cylinder 3)

Ċ

11

Spare

Ċ

12

To solenoid valve for electronic injection (injector 1 - cylinder 1)

Ċ

13

To solenoid valve for pressure adjustment

5590

14

Spare

Ċ

15

Sensor (fuel temperature) for switching on fuel warming

5592

16

Spare

Ċ

17

To ambient air temperature and pressure sensor for EDC (with EGR)

8150

18

To ambient air temperature and pressure sensor for EDC (with EGR)

8151

19

Air temperature and pressure sensor earth (without EGR)

0165

20

Earth shared by control unit and radialjet and pressure solenoid valves (no radialjet for F1A)

0000

21

To solenoid valve for radialjet pump control (not for F1A)

9917

22

Spare

Ċ

23

To solenoid valve for electronic injection (injector 3 - cylinder 4)

Ċ

24

To solenoid valve for electronic injection (injector 4 - cylinder 2)

Ċ

25

To solenoid valve controlling anti-pollution system (EGR.) (.13 - F1A)

5577

26

To ambient air temperature and pressure sensor for EDC (with EGR)

8152

27

To speed limiter adjustment sensor

8847

28

To ambient air temperature and pressure sensor for EDC (with EGR)

8153

29

To sensor for engine rpm

White

30

Earth shared by control unit and temperature sensors

0150

31

To engine rpm sensor on camshaft (cams)

Black

32

Control to relay for heated fuel oil filter

8159

33

To sensor for fuel pressure adjustment

5591

34

To turbo-blower air pressure and temperature sensor for EDC (without EGR)

5152

35

Control to relay for engaging conditioner compressor

9990

36

To solenoid valve actuator for VGT (.15) or to WASTE GATE solenoid valve (.13)

5000

37

To engine rpm sensor (.13 - .15 - F1A)

Black

38

Spare

-

39

Control to relay for engine cooling joint

7740

40

To solenoid valve for electronic injection (injector 1 - cylinder 1)

Ċ

41

To solenoid valve for electronic injection (injector 4 - cylinder 2)

Ċ

42

To solenoid valve for electronic injection (injector 3 - cylinder 4)

Ċ

43

To solenoid valve for electronic injection (injector 2 - cylinder 3)

Ċ

VIEW OF BOSCH 43-WAY CONNECTOR FROM CABLE INPUT SIDE

Figure 180

7421