DAF LF45, LF55 Series. Manual — part 50

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1-11

EBS-2 fault codes

EBS-2

DAVIE XD diagnostics manual

12

43-76

Interrupted communication, with a driving
combination, with the drawn vehicle ECU via pin
B6 (CAN-L) of the EBS unit due to:
-

interruption on pin B6 of the EBS unit

-

short circuit on pin B6 of the EBS unit

-

No noticeable system limitation in EBS

45-16

Interruption, short circuit to earth or short circuit to
supply on pin A18 of the EBS unit

-

No noticeable system limitation in EBS

51-21

Short circuit to earth on pin D11 of the EBS unit,
ABS valve (B256)

-

ABS on front axle, left deactivated

-

VSC system deactivated

51-22

Short circuit to supply on pin D11 of the EBS unit,
ABS valve (B256)

-

ABS on front axle deactivated

-

VSC system deactivated

51-23

Interruption on pin D12 of the EBS unit, ABS
valve (B256)

-

ABS on front axle, left deactivated

-

VSC system deactivated

51-24

Interruption on pin D11 of the EBS unit, ABS
valve (B256)

-

ABS on front axle, left deactivated

-

VSC system deactivated

51-25

Continuous actuation of ABS valve (B256) via
pins D10 and D12 and/or D11 and D12 of the
EBS unit due to:
-

internal short circuit in EBS unit

-

ABS on front axle deactivated

-

EBS pressure control on front axle and
drawn vehicle deactivated

-

VSC system deactivated

51-26

Interruption on pin D10 of the EBS unit, ABS
valve (B256)

-

ABS on front axle, left deactivated

-

VSC system deactivated

51-27

Short circuit to earth on pin D10 of the EBS unit,
ABS valve (B256)

-

ABS on front axle, left deactivated

-

VSC system deactivated

51-28

Short circuit to supply on pin D10 of the EBS unit,
ABS valve (B256)

-

ABS on front axle deactivated

-

VSC system deactivated

52-21

Short circuit to earth on pin C2 of the EBS unit,
ABS valve (B257)

-

ABS on front axle, right deactivated

-

VSC system deactivated

52-22

Short circuit to supply on pin C2 of the EBS unit,
ABS valve (B257)

-

ABS on front axle deactivated

-

VSC system deactivated

52-23

Interruption on pin C3 of the EBS unit, ABS valve
(B257)

-

ABS on front axle, right deactivated

-

VSC system deactivated

52-24

Interruption on pin C2 of the EBS unit, ABS valve
(B257)

-

ABS on front axle, right deactivated

-

VSC system deactivated

52-25

Continuous actuation of ABS valve (B527) via
pins C1 and C3 and/or C2 and C3 of the EBS unit
due to:
-

internal short circuit in ECU

-

ABS on front axle deactivated

-

EBS pressure control on front axle and
drawn vehicle deactivated

-

VSC system deactivated

52-26

Interruption on pin C1 of the EBS unit, ABS valve
(B257)

-

ABS on front axle, right deactivated

-

VSC system deactivated

52-27

Short circuit to earth on pin C1 of the EBS unit,
ABS valve (B257)

-

ABS on front axle, right deactivated

-

VSC system deactivated

52-28

Short circuit to supply on pin C1 of the EBS unit,
ABS valve (B256)

-

ABS on front axle deactivated

-

VSC system deactivated

53-32

Short circuit to earth on pin D12 or C3 of the EBS
unit, ABS valve (B256 or B257)

-

No noticeable system limitation in EBS

53-33

Short circuit to supply on pin D12 or C3 of the
EBS unit, ABS valve (B256 or B257)

-

ABS on front axle deactivated

-

VSC system deactivated

Fault code

Fault code description with possible cause

Symptom

EBS-2

1-12

©

EBS-2 fault codes

12

DAVIE XD diagnostics manual

55-12

Incorrect redundancy valve (B306) parameters
due to:
-

redundancy valve connected to the EBS unit
without the EBS unit having been
programmed for a redundancy valve

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on front axle, rear axle
and drawn vehicle deactivated

-

VSC system deactivated

55-31

Interruption in redundancy valve (B306),
measured via pin B12 of the EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

55-32

Short circuit to earth in redundancy valve (B306),
measured via pin B12 of the EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

55-33

Short circuit to supply in redundancy valve
(B306), measured via pin B12 of the EBS unit

-

ABS on front axle deactivated

-

VSC system deactivated

57-12

Incorrect ASR cut-off valve (B309) parameters
due to:
-

ASR cut-off valve connected to the EBS unit
without the EBS unit having been
programmed for an ASR cut-off valve

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on front axle, rear axle
and drawn vehicle deactivated

-

VSC system deactivated

57-31

Interruption on pin C6 of the EBS unit, ASR cut-
off valve (B309)

-

ASR brake control deactivated

57-32

Short circuit to earth on pin C6 of the EBS unit,
ASR cut-off valve (B309)

-

ASR brake control deactivated

57-33

Short circuit to supply on pin C6 of the EBS unit,
ASR cut-off valve (B309)

-

No noticeable system limitation in EBS

61-16

The current through the front axle modulator
(B307) magnet coil measured via pins D1 and D2
of the EBS unit is incorrect due to:
-

copper short circuit in the magnet coil

-

short circuit or contact resistance between
pins D1 and D2 of the EBS unit

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

61-55

Front axle modulator (B307) output pressure
measured on pin D6 of the EBS unit is incorrect
in relation to the current through the magnet coil
due to:
-

defective pressure sensor

-

too low a supply pressure

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

62-42

Pressure sensor failure in front axle modulator
(B307) due to:
-

short circuit to supply on pin D6 of the EBS
unit

-

interruption on pin D3 of the EBS unit

-

short circuit to supply on pin D3 of the EBS
unit

-

Open circuit in EBS pressure control, front
axle

-

VSC system deactivated

Fault code

Fault code description with possible cause

Symptom

©

1-13

EBS-2 fault codes

EBS-2

DAVIE XD diagnostics manual

12

62-43

With a nonactivated front axle modulator, the
front axle modulator (B307) pressure sensor
output signal on pin D6 of the EBS unit is too low
or too high due to:
-

defective pressure sensor

-

no supply voltage or supply voltage too low
on pin D9 of the EBS unit

-

interruption on pin D6 of the EBS unit

-

short circuit to earth on pin D6 of the EBS
unit

-

air pressure at connection point 4 of the front
axle modulator (B307) if the foot brake valve
(F628) is not activated

-

Open circuit in EBS pressure control, front
axle

-

VSC system deactivated

63-25

Permanent actuation of the front axle modulator
(B307) due to:
-

short circuit to supply on one side and short
circuit to earth on the other side

-

Brake remains applied to front axle

-

VSC system deactivated

63-32

Short circuit to earth on pin D1 of the EBS unit,
front axle modulator (B307)

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

63-33

Short circuit to supply on pin D1 of the EBS unit,
front axle modulator (B307)

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

63-34

Short circuit to earth on pin D2 of the EBS unit,
front axle modulator (B307)

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

63-35

Short circuit to supply on pin D2 of the EBS unit,
front axle modulator (B307)

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

63-36

Interruption on pin D1 and/or D2 of the EBS unit,
front axle modulator (B307)

-

EBS pressure control on front axle
deactivated

-

VSC system deactivated

64-13

The ECU parameters for the rear axle modulator
type do not correspond with the parameters in the
rear axle modulator (D978)

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on front axle, rear axle
and drawn vehicle deactivated

-

VSC system deactivated

64-14

The EBS unit detects a fault in the CAN message
from the rear axle modulator (D978)

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on front axle, rear axle
and drawn vehicle deactivated

-

VSC system deactivated

64-16

Fault in the solenoid valves of the rear axle
modulator (D978)

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

64-51

Output pressure of the rear axle modulator
(D978) is too high

-

ABS on rear axle deactivated

-

VSC system deactivated

Fault code

Fault code description with possible cause

Symptom

EBS-2

1-14

©

EBS-2 fault codes

12

DAVIE XD diagnostics manual

64-52

Brake pressure signal difference between both
pressure sensors in rear axle modulator (D978) is
too high

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

64-54

No pressure sensor signal in rear axle modulator
(D978) or signal is incorrect (too high/too low)

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

Open circuit in EBS pressure control, rear
axle

-

VSC system deactivated

64-64

CAN communication problem of the EBS unit with
the rear axle modulator (D879) via pins B1 and
B4 of the EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

Supply voltage on pin B7 of the EBS unit
interrupted

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

-

With an interruption on pin B7, connection
points A9 and E4 inside the ECU will have a
low voltage, causing brake pedal position
sensor 2 to give no output signal, for
instance. If the measurement is performed
at B7, it will also turn out that B7 in this
situation will be internally connected to earth
in the ECU

Interrupted earth connection or contact
resistance in the earth connection of the rear axle
modulator (D978)

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

64-77

The rear axle modulator (D978) has not received
a CAN message from the VSC module within a
specified period of time

-

VSC system deactivated

64-83

The EBS unit establishes that the rear axle
modulator (D978) has not sent the correct check
message during a check phase

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

VSC system deactivated

66-12

Incorrect drawn vehicle control valve (B308)
parameters due to:
-

drawn vehicle control valve connected to the
EBS unit without the EBS unit having been
programmed for a drawn vehicle control
valve

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on front axle, rear axle
and drawn vehicle deactivated

-

VSC system deactivated

66-16

The current measured by the drawn vehicle
control valve (B308) magnet coil via pins B10 and
B11 of the ECU is incorrect due to:
-

copper short circuit in the magnet coil

-

short circuit or contact resistance between
pins B10 and B11 of the EBS unit

-

EBS pressure control on drawn vehicle
deactivated

-

VSC system deactivated

Fault code

Fault code description with possible cause

Symptom