Iveco Daily. Manual — part 433
258
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
The electronic control unit controls different chassis positions in accordance with the requests from the driver.
As the ignition key switch is turned to ON position, the electronic central unit runs a system check while the red warning lamp
on the dashboard panel comes on for about 2 seconds.
If any failure is detected, this warning lamp can stay on fixed for serious system failure or flashing for compressor failure due to
overtemperature.
The electronic control unit checks the level sensor at regular intervals in order to keep chassis level constant as required by the
driver, and operates the necessary compensation when a deviation of more than 3 counts is detected.
The compensation shall be operated with the following delay:
~ 1 sec. with vehicle still
~ 30 sec. with vehicle moving
If the level is not restored within a maximum time of 30 seconds from the beginning of the compensation, the control unit
memorizes a plausibility error and the warning lamp comes on fixed.
During braking, the electronic control unit detects the signal from the stop light switch and stops any chassis level automatic
adjustment.
If a difference of more than 4 counts is detected between RH and LH sensors with vehicle still, after a delay of about 8 seconds,
the control unit recognizes a step" condition and stores the data in memory, keeping the chassis level as it is.
Besides a blink code" option through the red warning lamp for preliminary diagnosis, the electronic control unit is provided
with an advanced self-diagnosis system capable to detect and memorize any failures, depending on the concurrent conditions,
including intermittent errors occurred in the system during operation and ensure a more appropriate and reliable servicing.
All interventions concerning diagnosis, programming, failures memory deletion, etc. can be performed by using available diagnosis
instrument.
ELECTRIC/ELECTRONIC SYSTEM
259
D
AILY
Electronic control unit pin out
Pin
Function
Cable
colour code
1
Battery positive supply
7772
2
L" line to pin 15 of the 38-pole diagnostic connector
1194
3
-
-
4
K" line to pin 16 of the 38-pole diagnostic connector
2294
5
-
-
6
-
-
7
-
-
8
RH level sensor positive
5421
9
Ignition switch positive supply
8090
10
-
-
11
(Positive to air reservoir solenoid valve supply)
9445
12
-
-
13
Positive to LH chassis control solenoid valve
9425
14
-
-
15
Positive to electric compressor control relay
9444
16
Positive from stop light switch
1363
17
-
-
18
-
-
19
Negative from chassis level push-button
8420
20
-
-
21
-
-
22
Vehicle speed signal
5411
23
-
-
24
-
-
25
LH level sensor positive
5422
26
Chassis lift/lower push-button communication line
8091
27
Negative
0000
28
-
-
29
Positive to relief solenoid valve
9423
30
-
-
31
Positive to RH chassis control solenoid valve
9424
32
-
-
33
Negative for failure warning lamp
6008
34
-
-
35
-
-
Figure 299
000095t
260
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
The level sensor consists of a coil fastened to the chassis and
a piston (Figure 300).
The piston is moved inside the coil by the action of a cam and
a lever connected to the axle, this way varying the coil
inductance.
These variations shall be used by the electronic control unit
at the different stages of system operation.
Here is shown the nominal characteristic curve of the sensor
as a function of the angle displacement of the lever.
LEVEL SENSOR
OPERATING DIAGRAM
Figure 300
Figure 301
000369t
000370t
ELECTRIC/ELECTRONIC SYSTEM
261
D
AILY
Pneumatic supply unit
This component produces, dries,supplies or discharges
suspension spring air.
Components of the air supply unit
1. Relief solenoid valve
2. Electrical motor control relay
3. Intake filter
4. RH chassis control solenoid valve
5. LH chassis control solenoid valve
6. Compressor
7. Drier filter
8. Compressor electrical motor
9. Electrical connector
INTERNAL COMPRESSED AIR DIAGRAM
SUPPLY UNIT
1
2
3
4
5
6
7
8
9
Figure 302
000222t
Figure 303
000222t
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