Iveco Daily Euro 4. Manual — part 188
Figure 97
1 - ECU (ECAS).
2 - Manual chassis levelling control switch.
3 - Chassis lifting control switch.
4 - Chassis lowering control switch.
5 - Warning light ECAS.
6 - Stop light switch.
7 - Speedometer - tachograph.
8 - Right air spring.
9 - Right level sensor.
10 - Hydraulic load sensing valve*.
11 - Load sensing valve control pneumatic cylinder*.
12 - Left level sensor.
13 - Left air spring.
14 - Electrocompressor and distribution valve unit.
15 - Right chassis control solenoid valve.
16 - Left chassis control solenoid valve.
17 - Choke valve.
18 - Drier filter
19 - Air spring discharge solenoid valve.
20 - One-way valve.
21 - Compressor.
22 - One-way valve
23 - Intake filter.
24 - Compressor motor
25 - Motor control relay
26 - Diagnosis socket
* For vehicles without ABS only.
Legend
000216T
Electronic-control
Vehicles: 29 L - 35 S
88
REAR AIR SUSPENSIONS
D
AILY
E
URO
PNEUMATIC SYSTEM WABCO (ECAS)
Figure 98
1
- Warning light
2
- Right level sensor
3
- Right air spring
4
- Chassis lowering control button
5
- Manual chassis levelling control button
6
- Electronic control unit
7
- Chassis lifting control button
8
- Hydraulic brake corrector
9
- Corrector control pneumatic cylinder
10 - Left air spring
11 - Pneumatic feeding unit
12 - Left level sensor
13 - Central diagnosis connector
Legend
112174
REAR AIR SUSPENSIONS
89
D
AILY
E
URO
Vehicles without ABS
Figure 99
1
- Warning light
2
- Right level sensor
3
- Right air spring
4
- Chassis lowering control button
5
- Manual chassis levelling control button
6
- Electronic control unit
7
- Chassis lifting control button
8
- Left air spring
9
- Pneumatic feeding unit
10 - Left level sensor
11 - Central diagnosis connector
Legend
112175
90
REAR AIR SUSPENSIONS
D
AILY
E
URO
Vehicles with ABS
The system consists of the following:
- Pneumatic supply unit (electrocompressor, solenoid
valve unit);
- One ECU;
- Two level sensors;
- Two air springs;
- Three levelling push buttons (1, 2, 3);
- One warning light (4).
Level sensors send to ECU the signals corresponding to
chassis-road distance. The ECU processes these signals,
generates accordingly activation signals and sends them to the
electrocompressor.
Turn the ignition key to ”MAR” and depress push buttons (1,
2, 3) for lifting, lowering or activating the self-levelling function
of the chassis.
This system enables vehicle running up to 20 km/h under
whatever height and level condition. When this speed is
exceeded, chassis automatic levelling is activated.
Variation operations are indicated by warning light (4) blinking.
62356
This unit produces the compressed air required to supply the
pneumatic system and enables to bleed air from the
pneumatic system to lower the load bed.
62357
The ECU is the mastermind of the system.
It controls every logic function of suspensions under both
static and dynamic stage.
ECU receives signals from the control switches set in the cab
and lifts and lowers the load bed accordingly. It also receives
signals
from
the
level
sensors
and
controls
the
electrocompressor and the air spring to keep the vehicle in the
self-levelling condition.
ECU indicates any system failure through the dedicated
warning light set on the instrument panel.
Figure 100
Operation
MAIN SYSTEM COMPONENTS
790560
PNEUMATIC SUPPLY UNIT
Specifications and data
Type
Wabco
Lubrication
Dry operation
Max. operating pressure
12.7 bar
Operating temperature
-30 C
° to 65° C
Rated voltage
12V DC
Figure 101
Figure 102
766175
ELECTRONIC CONTROL UNIT
CHASSIS SELF-LEVELLING, LIFTING AND
LOWERING
112176
REAR AIR SUSPENSIONS
91
D
AILY
E
URO
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