DAF 95XF. Manual — part 157

©

200438

1-1

EBS fault codes

EBS

DAVIE XD diagnostics manual

1

1. EBS FAULT CODES

1.1 INTRODUCTION

If the electronic unit detects a system fault, this

fault is usually stored in the memory of the

electronic unit as a fault code.

Most system faults will also generate a warning.

EBS

1-2

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200438

EBS fault codes

1

DAVIE XD diagnostics manual

1.2 EXPLANATORY NOTES TO EBS FAULT CODES

If there is an electrical fault in the EBS system,

the symptom "open circuit in EBS pressure

control" or "deactivation of EBS pressure control"

may occur as a system reaction.

Open circuit in EBS pressure control
On application of the foot brake valve, the

electronic unit will receive information on the

desired vehicle deceleration from the brake pedal

position sensor in the foot brake valve.

In the electronic unit, this vehicle deceleration

command is converted into brake pressure to the

brake cylinders.

If there is no feedback from the output pressure

or wheel speed, there will be less accurate

electronically controlled deceleration and brake

force distribution.

Deactivation of EBS pressure control
The output pressure control in the brake cylinders

is entirely pneumatic; i.e. there is no more

electronically controlled deceleration and brake

force distribution.

Fault code

Fault code description with possible cause

Symptom

11-18

Voltage on pin A8 of the EBS unit is too low due
to:
-

contact resistance or poor connection to pin
A8 of the EBS unit

-

ABS on front axle deactivated

-

ASR brake control deactivated

-

EBS pressure control on front axle and
drawn vehicle deactivated

11-31

Extremely low voltage (<3 V) on pin A8 of the
EBS unit due to:
-

excessive contact resistance on pin A8 of
the EBS unit

-

interruption on pin A8 of the EBS unit

-

ABS on front axle deactivated

-

ASR brake control deactivated

-

EBS pressure control on front axle and
drawn vehicle deactivated

12-18

Voltage on pin A9 of the EBS unit is too low due
to:
-

contact resistance or poor connection to pin
A9 of the EBS unit

-

short circuit to earth on pin B7 of the EBS
unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

12-31

Extremely low voltage (<3 V) on pin A9 of the
EBS unit due to:
-

excessive contact resistance on pin A9 of
the EBS unit

-

interruption on pin A9 of the EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

Short circuit to earth on pin E4 or B7 of the EBS
unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

EBS pressure control on rear axle
deactivated

-

Pin B7 is connected to earth inside the EBS
unit while the power supply to A9 and E4 is
interrupted inside the unit.

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200438

1-3

EBS fault codes

EBS

DAVIE XD diagnostics manual

1

13-18

Voltage on pin A7 of the EBS unit is too low due
to:
-

contact resistance or poor connection to pin
A7 of the EBS unit

-

No noticeable system limitation in EBS

14-32

Sensor supply voltage on pins D9, B13 or E1 of
the EBS unit due is too low due to:
-

contact resistance or poor connection on
specified connection points of the EBS unit

-

short circuit to earth on specified connection
points of the EBS unit

-

No noticeable system limitation in EBS

14-33

Constant voltage, even if the ignition is turned off
and the brake is not applied, on pin D9, B13 or E1
of the EBS unit due to:
-

short circuit to supply on specified
connection points of the EBS unit

-

No noticeable system limitation in EBS

15-33

Constant voltage, even if the ignition is turned off
and the brake is not applied, on pin B7 of the EBS
unit due to:
-

short circuit to supply on pin B7 of the EBS
unit

-

No noticeable system limitation in EBS

16-11

Internal failure in EBS electronic unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

16-12

Configuration parameters in the electronic unit
incorrect due to:
-

incorrect programming

-

retrofitted components without identification
card (oxford) change

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

16-15

Internal failure in EBS electronic unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

16-17

Voltage (>32 V) on pins A7, A8 and A9 of the EBS
unit is too high due to:
-

excessive alternator/battery voltage

-

inductive voltage of external component

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

16-18

Voltage on pins A7, A8 and A9 of the EBS unit at
a speed of >2 km/h is too low due to:
-

insufficient battery voltage

-

poor earth connection to EBS electronic unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

16-53

Incorrect tyre size due to:
-

incorrectly programmed tyre size

-

tyre sizes of front and rear axles in different
tyre classes without unit having been
reprogrammed

-

The difference in peripheral speed between
the left and right wheel on the same axle
exceeds 10%

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

21-37

Interruption on pin C4 and/or C5 of the EBS unit,
wheel speed sensor (F513)

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

Fault code

Fault code description with possible cause

Symptom

EBS

1-4

©

200438

EBS fault codes

1

DAVIE XD diagnostics manual

21-38

Unacceptable wheel speed sensor frequency
signal from wheel speed sensor (F513) on pins
C4 and C5 of the EBS unit due to:
-

loose pole ring

-

wrong assessment by EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

21-41

Short circuit to earth on pin C4 and/or C5 of the
EBS unit, wheel speed sensor (F513)

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-42

Short circuit to supply on pin C4 and/or C5 of the
EBS unit, wheel speed sensor (F513)

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-44

Short circuit on pin C4 and/or C5 of the EBS unit,
wheel speed sensor (F513)

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-45

Incorrect wheel speed sensor sine-wave signal
from wheel speed sensor (F513) on pins C4 and
C5 of the EBS unit due to:
-

distorted wheel speed sensor ring

-

damaged wheel speed sensor ring

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-46

No uniformity (frequency changes) of wheel
speed sensor signal from wheel speed sensor
(F513) on pins C4 and C5 of the EBS unit due to:
-

heavy point due to brake disc wobble, for
example

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-47

Excessive oscillation of wheel speed sensor
signal (maximum/minimum level) from wheel
speed sensor (F513) on pins C4 and C5 of the
EBS unit due to:
-

excessive wheel bearing play

-

incorrect mounting of wheel speed sensor
ring

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

21-48

Minimum value of wheel speed sensor signal
from wheel speed sensor (F513) on pins C4 and
C5 of the EBS unit is too low due to:
-

too large an air gap between wheel speed
sensor ring and wheel speed sensor

-

contact resistance on pin C4 and/or C5 of
the EBS unit

-

ABS on front axle, right deactivated

-

ASR brake/engine control deactivated

22-37

Interruption on pin D7 and/or D8 of the EBS unit,
wheel speed sensor (F512)

-

ABS on front axle, left deactivated

-

ASR brake/engine control deactivated

22-38

Unacceptable wheel speed sensor frequency
signal from wheel speed sensor (F512) on pins
D7 and D8 of the EBS unit due to:
-

loose pole ring

-

wrong assessment by EBS unit

-

ABS on front and rear axles deactivated

-

ASR brake/engine control deactivated

-

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

22-41

Short circuit to earth on pin D7 and/or D8 of the
EBS unit, wheel speed sensor (F512)

-

ABS on front axle, left deactivated

-

ASR brake/engine control deactivated

22-42

Short circuit to supply on pin D7 and/or D8 of the
EBS unit, wheel speed sensor (F512)

-

ABS on front axle, left deactivated

-

ASR brake/engine control deactivated

22-44

Short circuit on pin D7 and/or D8 of the EBS unit,
wheel speed sensor (F512)

-

ABS on front axle, left deactivated

-

ASR brake/engine control deactivated

Fault code

Fault code description with possible cause

Symptom