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