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Iveco EuroCargo (12 to 26 t). Manual - part 154

This components consists of three control solenoid valves
”A”, ”B”, ”C” and three pneumatic distributors.

Solenoid valve ”A” manages the supply/discharge distributor.

Solenoid valve ”B” manages the right-hand chassis trim
distributor.

Solenoid valve ”C” manages the left-hand chassis trim
distributor.

The distributor is connected to the system by means of a
four-pole connector.

78805

Figure 22

70117

Figure 23

78806

Operation

Rear axle lowering

In this case, the ECU energises solenoid valves ”B” and ”C”
supplying the second and third distributor, allowing the air to
be relieved from the air springs from duct (3), which is open
because the axle electro-pneumatic solenoid valve ”A” is
de-energised.

Self-leveling

The ECU, according to the position of the level sensors,
controls solenoid valves ”A”, ”B” and/or ”C” accordingly for
lifting or lowering in order to reach vehicle levelling or stored
positions ”M1” or ”M2”.

Pneumatic connections
11 - from air reservoir
21 - to axle electro-pneumatic distributor
22 - to air spring on right-hand side
23 - to air spring on left-hand side
Electrical connections
6.1 - Solenoid valve ”A” power positive
6.2 - Solenoid valve ”B” power positive
6.3 - Solenoid valve ”C” power positive
6.4 - Common negative

Figure 24

4x2 P vehicles

Duct (21) is capped.

4x2 FP vehicles

Duct

(21)

connected

front

axle

electro-pneumatic

distributor

duct

(14)

for

supplying the air springs.

Rear axle lifting

The ECU energises solenoid valve ”A” supplying the first
distributor that closes the relief to atmosphere (3) and opens
the air intake (11) from the reservoir.
The ECU then energises solenoid valve ”B” and ”C” for
supply the second and third distributor and to consequently
supply the rear axle air springs via ducts (22 and 23).

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12-26 t

FRONT AND REAR PNEUMATIC SUSPENSIONS

Base - February 2003

Figure 25

Figure 26

ECU

The ECU manages the various chassis positions according to
the requests made by the driver by means of the remote
control.
When the key switch is switched on, the electronic control
unit performs a system check by powering, during ~ 2
seconds, the red warning light (pneumatic suspension low
pressure) found on the dashboard. If an anomaly is found, the
CLUSTER display will show the corresponding symbol,
according to the type of anomaly: a yellow symbol on the left
portion (anomalies and faults not critical), or a red symbol on
the right portion (critical faults). The ECU must keep the
levels required by the driver constant and, at the same time,
reduce air consumption, by cyclically monitoring the level
sensor signals, cutting in ONLY when the discrepancy
between sensors is > 5 counts.
Correction will be made with a delay of:
D approximately 1 second when the vehicle is stationary
D approximately 60 seconds when the vehicle is moving.
The ECU will store a plausibility error if the level is not
restored within a maximum time of 30 seconds.

When braking, the ECU receives a signal from the brake light
switch, interrupting automatic trim adjustments. The ECU is
equipped with an extremely advanced self-diagnostic system
which is capable of recognising and storing system failures
(also intermittent), according to environmental conditions,
during operation, for ensuring correct, reliable repairs, in
addition to blink codes displayed by the red warning light for
preliminary troubleshooting. Diagnostic, programming and
error memory deletion operations, etc., can be carried out
using the MODUS computerised diagnostic station. All
system components, except for the steering system, are
connected to the ECU, by means of a comb connector. The
pin numbering and ECU type change according to the version.

This is ONLY valid providing that the vehicle has
been moving for at least five minutes, because the
system details checks to allow recharging the
pneumatic system.

The level sensor consists of a coil fastened to the chassis and
a piston.
The piston is moved by an eccentric gear and a lever
connected to the axle when the height changes, whereby
changing the inductance of the coil.
These variations are used by the ECU to intervene in the
various phases of system work.
The sensor connection lever is fixed and cannot be adjusted.

62421

This elastic element contains pressurised air and changes its
extension, regardless of the applied load.

30106

Figure 27

62422

Sensor nominal characteristic curve according to angular
lever movement

[conteggi]

[gradi]

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12-26 t

FRONT AND REAR PNEUMATIC SUSPENSIONS

Base - February 2003

5007 Air springs

(NEWAY for Models 110EL..P-120EL..P)

Figure 28

72815

Arrange the vehicle on level ground and block the front
wheels.
Remove the wheel fastening nut guards and loosen the wheel
fastening nuts.
Lift the back of the vehicle and position it on stands.
Arrange hydraulic jack 99321024 under the wheels, remove
the wheel fastening nuts and remove the wheels.

Removal

The following procedure described for one arm is valid for
both.
- Disconnect the electrical connections (4) to prevent

damage.

- Loosen nut (8), remove the anchoring pin and detach

shock absorber (9) from the support on the arm.

- Remove the nuts (7) and the rear axle anchoring

brackets (10).

Stop the rocker arms (3) from moving while
removing the nuts (7).

- Loosen the fastener and remove the level sensor tie-rod

(2).

- Loosen air spring fastening nut (5).

- Loosen the fastening nuts and remove the bars (6).

- Loosen fastening nut (1). Remove the anchoring pin and

remove the concerned arm (3).

Refitting

Refit by reversing the removal sequence. Fasten
screws and nuts at the specified torque.

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ECTOR

12-26 t

FRONT AND REAR PNEUMATIC SUSPENSIONS

Base - February 2003

REAR PNEUMATIC SUSPENSIONS REMOVAL-REFITTING

Figure 29

500940

REAR SHOCK ABSORBERS

Removal

Loosen the upper and lower nuts (3), remove the upper and
lower anchoring pins (1) and remove the shock absorber (2)
from the vehicle.

Refitting

Refit by reversing the removal sequence. Fasten
screws and nuts at the specified torque.

Figure 30

528960

REAR SWAY BAR

Removal

Loosen the air spring anchoring screws (1). Loosen the
fastening nuts (2) and remove the sway bar (3) from the
rocker arms.

Refitting

Refit by reversing the removal sequence. Fasten
screws and nuts at the specified torque.

72816

72817

Figure 31

500731

REAR AIR SPRINGS

Removal

Disconnect the air supply tubes (2).

Loosen the fastening screws (1), loosen the nut (4) and
remove the air spring (3) from the vehicle.

Refitting

Refit by reversing the removal sequence. Fasten
screws and nuts at the specified torque.

72818

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12-26 t

FRONT AND REAR PNEUMATIC SUSPENSIONS

Base - February 2003

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