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