DAF 95XF. Manual — part 193
©
200438
3-1
System inspection with DAVIE XD
ECAS-2
DAVIE XD diagnostics manual
8
3. SYSTEM INSPECTION WITH DAVIE XD
3.1 CALIBRATING THE SENSORS
The sensors must be calibrated if the height and/
or pressure sensors of the ECAS unit are
replaced.
Note:
Calibration should be carried out with due care to
avoid physical injury and material damage.
Additionally, the trailing or leading rear axle may
be lowered automatically during these
operations.
When the unit is programmed, the standard
maximum chassis height of the rear axle and
subsequently the desired maximum chassis
height of the front axle are calibrated.
Explanation
1.
Place the gauges between the driven axle
and the chassis.
2.
Lower the chassis using DAVIE XD until it
rests on the gauges.
Note:
-
On the front axle the vertical rod is
adjustable. The height setting of this
vertical rod must be such that lever (1) is
horizontal when the driving height is
approx. 80 mm.
-
On high-volume vehicles the vertical rod
on the rear axle is adjustable. The height
setting of this vertical rod must be such
that lever (1) is horizontal when the
driving height is approx. 60 mm.
-
When the height sensors have been
calibrated, the pressure sensor is
subsequently calibrated automatically.
All the air is exhausted from the bellows.
3.
Now bring the chassis to the desired
maximum height at the front axle.
Note:
-
The maximum height of the chassis is
limited by the mechanical stop of the
shock absorber.
-
The highest level of standard sensor
sensitivity setting must be a minimum of
20 mm above the normal driving level;
otherwise an error will occur in the
height sensor values.
A.
Calibrating the sensors on replacing the
ECAS unit
ECAS-2
3-2
©
200438
System inspection with DAVIE XD
8
DAVIE XD diagnostics manual
If a height and/or pressure sensor has been
replaced, the sensor must be recalibrated.
The maximum desired chassis height at the rear
axle and the maximum desired chassis height at
the front axle are calibrated.
1.
Place the gauges between the driven axle
and the chassis.
2.
Lower the chassis using DAVIE XD until it
rests on the gauges.
Note:
-
On the front axle the vertical rod is
adjustable. The height setting of this
vertical rod must be such that lever (1) is
horizontal when the driving height is
approx. 80 mm.
-
On high-volume vehicles the vertical rod
on the rear axle is adjustable. The height
setting of this vertical rod must be such
that lever (1) is horizontal when the
driving height is approx. 60 mm.
-
When the height sensors have been
calibrated, the pressure sensor is
subsequently calibrated automatically.
All the air is exhausted from the bellows.
3.
Now bring the chassis to the desired
maximum height at the front axle.
Then bring the chassis to the desired
maximum height at the rear axle.
Note:
The maximum height of the chassis is limited
by the mechanical stop of the shock
absorber.
The shock absorber of the non-driven 3rd
axle may reach its stop before the shock
absorber of the driven axle.
The highest level of standard sensor
sensitivity setting must be a minimum of
20 mm above the normal driving level;
otherwise an error will occur in the height
sensor values.
B.
Calibrating the sensors when replacing
the height and/or pressure sensor
©
200438
3-3
System inspection with DAVIE XD
ECAS-2
DAVIE XD diagnostics manual
8
3.2 CHECKING HEIGHT SENSOR
The height sensor can be checked using
DAVIE XD.
1.
Admit air to the bellows. The value indicated
by DAVIE XD must now show a linear
increase.
2.
Exhaust air from the bellows. The value
indicated by DAVIE XD must now show a
linear decrease.
3.
If the value falls when air is admitted and
rises when air is exhausted, the height
sensor has been incorrectly fitted.
Item that requires special attention when
fitting the height sensor:
There is a projection (1) on the hub of the
height sensor. On the left-hand (L) height
sensor the projection should point in the
same direction as the electrical connection.
On the right-hand (R) height sensor the
position of the projection is turned 180
in
relation to the projection on the left-hand
height sensor.
Note:
If two height sensors are used, these two
sensors, with the vehicle at the driving level,
may give a different reading (caused, for
example, by play in the linkage).
This may result in the vehicle not being level.
This can be solved by recalibrating the
sensors.
1
1
C900143
R
L
ECAS-2
3-4
©
200438
System inspection with DAVIE XD
8
DAVIE XD diagnostics manual
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