DAF 95XF. Manual — part 185

©

200438

1-11

EMAS fault codes

EMAS

DAVIE XD diagnostics manual

5

630-31

Short circuit to supply in front axle angle sensor
(F687) on pin C14 of the ECU

-

Trailing axle in centre position and does not
steer anymore

Short circuit to earth or to supply in angle sensors
(F687 and F688) on pin C3 of the ECU

Short circuit to supply in trailing axle angle sensor
(F688) on pin C12 of the ECU

Short circuit to earth or to supply in pressure
sensors (PSX and PSY) on pin D4 of the ECU

Short circuit to earth or to supply in centring circuit
pressure sensor (PSY) on pin C9 of the ECU

Short circuit to supply in steering circuit pressure
sensor (PSX) on pin C10 of the ECU

631-31

Cannot reach nominal pressure in steering circuit
while steering circuit needs to be filled, due to:
-

the fluid flow not being controlled due to
mechanical blocking of the pressure relief
valve (SP201)

-

non-switching release valve (SP051)

-

Trailing axle in centre position and does not
steer anymore

632-31

Difference between desired and actual trailing
axle angle too large due to:
-

control valve (SP011)

-

Trailing axle in centre position and does not
steer anymore

633-31

Difference between desired and actual trailing
axle angle too large due to:
-

loose angle sensor lever

-

defective angle sensor

-

Trailing axle in centre position and does not
steer anymore

634-31

Internal failure in EBS electronic unit (D880)

-

Trailing axle in centre position and does not
steer anymore

-

EBS or ABS warning

Internal failure in VIC electronic unit (D900)

-

Trailing axle in centre position and does not
steer anymore

Short circuit to supply of vehicle speed-
dependent signal on pin A3 of the ECU

-

Trailing axle co-steers

635-31

Internal MTCO failure (B525)

-

Trailing axle in centre position and does not
steer anymore

Fault code

Fault code description with possible cause

Symptom

EMAS

1-12

©

200438

EMAS fault codes

5

DAVIE XD diagnostics manual

©

200438

2-1

System inspection with DAVIE XD

EMAS

DAVIE XD diagnostics manual

5

2. SYSTEM INSPECTION WITH DAVIE XD

2.1 GENERAL

When changes are made to the EMAS system or

when it is opened, the system must be calibrated.

2.2 "CALIBRATION" MENU

The "Calibration" menu is divided into several

tests:

-

Air test

-

Bleeding

-

Releasing the pressure

-

Hydraulic test

-

Electric test

-

Complete calibration

Air test
This test is used to check whether there is air in

the EMAS system.

If so, the EMAS system must be bled.

Bleeding
With this test, an air test will be carried out first. If

air is found in the EMAS system, the trailing axle

will be steered back and forth and there is a

possibility of releasing air. Afterwards another air

test will be carried out to check whether there is

still air in the system.

If air is still present, the above routine is repeated.

Releasing the pressure
If centring circuit components or components

connected to the centring circuit need to be

removed, the pressure in the centring circuit must

be released. When this test is selected, the

pressure in the centring circuit will be released by

opening and closing various valves.

Hydraulic test
Checking the hydraulic system:

With this test it is checked whether the various

valves are properly steered and/or the system

lines are properly connected. Furthermore, the

central position of the steering cylinder is also

calibrated.

EMAS

2-2

©

200438

System inspection with DAVIE XD

5

DAVIE XD diagnostics manual

Electric test
Checking the electric system:

With this test it is checked whether all sensors

and valves of the EMAS system are connected;

furthermore, the resistors of the coils are

checked.

Complete calibration
The complete calibration consists of:

-

Electric test

-

Hydraulic test

-

Air test

The sensors are calibrated in between.

This complete calibration is necessary after

virtually any work is carried out on the system.