DAF LF45, LF55 Series. Manual — part 49

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1-7

EBS-2 fault codes

EBS-2

DAVIE XD diagnostics manual

12

24-44

Short circuit between pins C1 and C2 of the rear
axle modulator (D978), wheel speed sensor
(F514)

-

ABS on rear axle, left deactivated

-

ASR brake/engine control deactivated

-

VSC system deactivated

24-45

Incorrect wheel speed sensor sine-wave signal
from wheel speed sensor (F514) on pins C1 and
C2 of the rear axle modulator (D978) due to:
-

distorted wheel speed sensor ring

-

damaged wheel speed sensor ring

-

ABS on rear axle, left deactivated

-

ASR brake/engine control deactivated

-

VSC system deactivated

24-46

No uniformity (frequency changes) of wheel
speed sensor signal from wheel speed sensor
(F514) on pins C1 and C2 of the rear axle
modulator (D978) due to:
-

excessive wheel bearing play

-

incorrect mounting of wheel speed sensor
ring

-

ABS on rear axle, left deactivated

-

ASR brake/engine control deactivated

-

VSC system deactivated

24-47

Excessive oscillation of wheel speed sensor
signal (maximum/minimum level) from wheel
speed sensor (F514) on pins C1 and C2 of the
rear axle modulator (D978) due to:
-

excessive wheel bearing play

-

incorrect mounting of wheel speed sensor
ring

-

ABS on rear axle, left deactivated

-

ASR brake/engine control deactivated

-

VSC system deactivated

24-48

Minimum value of wheel speed sensor signal
from wheel speed sensor (F514) on pins C1 and
C2 of the rear axle modulator (D978) is too low
due to:
-

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

-

contact resistance on pin C1 and/or C2 of
the rear axle modulator

-

ABS on rear axle, left deactivated

-

ASR brake/engine control deactivated

-

VSC system deactivated

31-16

Large deviation between the duty cycle signals
from the foot brake valve (F628) on pins E2 and
E5 of the EBS unit due to:
-

internal fault in foot brake 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

-

Low voltage on connection point A9 inside
EBS unit

31-52

Large deviation between the duty cycle signals
from the foot brake valve (F628) on pins E2 and
E5 of the EBS unit due to:
-

internal fault in foot brake valve

-

No noticeable system limitation in EBS

32-37

No signal from brake pedal position switch 1 in
foot brake valve (F628) on pin E3 of the EBS unit
due to:
-

defective switch in foot brake valve

-

interruption on pin E3 of the EBS unit

-

No noticeable system limitation in EBS

32-41

Brake pedal position switch 1 remains closed in
foot brake valve (F628) or short circuit to earth on
pin E3 of the EBS unit

-

The actuating pressure control is active
when the brake pedal is not applied; after a
specified time (approx. 1 min.) the actuating
pressure control will automatically
disengage.

Fault code

Fault code description with possible cause

Symptom

EBS-2

1-8

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EBS-2 fault codes

12

DAVIE XD diagnostics manual

33-37

No signal from brake pedal position switch 2 in
foot brake valve (F628) on pin E6 of the EBS unit
due to:
-

defective switch

-

interruption on pin E6 of the EBS unit

-

short circuit to supply on pin E6 of the EBS
unit

-

No noticeable system limitation in EBS

33-41

Brake pedal position switch 2 remains closed in
foot brake valve (F628) or short circuit to earth on
pin E6 of the EBS unit

-

The actuating pressure control is active
when the brake pedal is not applied; after a
specified time (approx. 1 min.) the actuating
pressure control will automatically
disengage.

34-41

Lower signal level from brake pedal position
sensor 1 in foot brake valve (F628) on pin E2 of
the EBS unit is too low during a specified period
of time due to:
-

contact resistance on pin E2 of the EBS unit

-

internal fault in foot brake valve

-

short circuit to earth on pin E2 of the EBS
unit

-

No noticeable system limitation in EBS

34-43

Upper signal level from brake pedal position
sensor 1 in foot brake valve (F628) on pin E2 of
the EBS unit is too high during a specified time or
the pulse width of the signal is incorrect due to:
-

short circuit to supply on pin E2 of the EBS
unit

-

internal fault in foot brake valve

-

interruption on pin E1 of the EBS unit

-

interruption on connection point E2

-

No noticeable system limitation in EBS

35-41

Lower signal level from brake pedal position
sensor 2 in foot brake valve (F628) on pin E5 of
the EBS unit is too low during a specified period
of time due to:
-

contact resistance on pin E5 of the EBS unit

-

internal fault in foot brake valve

-

short circuit to earth on pin E5 of the EBS
unit

-

No noticeable system limitation in EBS

35-43

Upper signal level from brake pedal position
sensor 2 in foot brake valve (F628) on pin E5 of
the EBS unit is too high during a specified time or
the pulse width of the signal is incorrect due to:
-

short circuit to supply on pin E5 of the EBS
unit

-

internal fault in foot brake valve

-

interruption on pin E4 of the EBS unit

-

interruption on pin E5 of the EBS unit

-

No noticeable system limitation in EBS

41-39

No CAN message "TCO1" received from the
tachograph in relation to the vehicle speed

No CAN message "CCVS" received from the
engine management system with regard to the
parking brake switch, clutch pedal switch or
vehicle speed related to the wheel speed

-

No noticeable system limitation in EBS

Fault code

Fault code description with possible cause

Symptom

©

1-9

EBS-2 fault codes

EBS-2

DAVIE XD diagnostics manual

12

41-58

No CAN message "ERC1" received within a
specified period of time from the intarder in
relation to the intarder braking torque

-

No noticeable system limitation in EBS

41-59

No CAN message "CFG", "intarder configuration"
received from the intarder within a specified
period of time

-

No noticeable system limitation in EBS

41-61

Communication via V-CAN on pins A1 and A3 of
the EBS unit not possible when switching on
ignition due to:
-

interruption on pin A1 of the EBS unit

-

short circuit to earth on pin A3 of the EBS
unit

-

short circuit to supply on pin A1 and/or A3 of
the EBS unit

-

ASR brake/engine control deactivated

-

VSC system deactivated

41-62

Unacceptable vehicle speed information via V-
CAN compared with the vehicle speed measured
via wheel speed sensors

-

VSC system deactivated

41-63

Interrupted communication via V-CAN on pins A1
and A3 of the EBS unit due to:
-

interruption on pin A1 and/or A3 of the EBS
unit

-

short circuit to earth on pin A3 of the EBS
unit

-

short circuit to supply on pin A1 and/or A3 of
the EBS unit

-

ASR brake/engine control deactivated

-

VSC system deactivated

41-65

No CAN message "ERC1" received within a
specified period of time from the engine
management system in relation to the engine
braking torque

-

No noticeable system limitation in EBS

41-66

No CAN message "EEC1" received within a
specified period of time from the engine
management system in relation to the engine
torque and engine speed

-

No noticeable system limitation in EBS

41-67

No CAN message "ETC1" received within a
specified period of time from the gearbox
(AS Tronic) if the drive line is activated

-

No noticeable system limitation in EBS

41-68

No CAN message "CCVS" received within a
specified period of time from the engine
management system in relation to the parking
brake status, vehicle speed and clutch status

-

No noticeable system limitation in EBS

41-69

No CAN message "TCO1" received within a
specified period of time from the tachograph in
relation to vehicle speed

-

No noticeable system limitation in EBS

41-71

No CAN message received from VIC within a
specified period of time

-

No noticeable system limitation in EBS

41-72

No CAN message "CFG", "DEB configuration"
received from the engine management system
within a specified period of time

-

No noticeable system limitation in EBS

41-73

No CAN message "ERC1" received within a
specified period of time from the engine
management system in relation to the engine
braking torque

-

No noticeable system limitation in EBS

Fault code

Fault code description with possible cause

Symptom

EBS-2

1-10

©

EBS-2 fault codes

12

DAVIE XD diagnostics manual

41-74

No CAN message "CFG", "engine brake
configuration" received from the engine
management system within a specified period of
time

-

No noticeable system limitation in EBS

41-78

No CAN message "CFG", "engine configuration"
received from the engine management system
within a specified period of time

-

No noticeable system limitation in EBS

41-86

No CAN message "EEC2" received within a
specified period of time from the engine
management system in relation to the position of
the accelerator pedal/idling switch

-

No noticeable system limitation in EBS

41-87

No CAN message "EEC3" received within a
specified period of time from the engine
management system in relation to the torque
required to overcome frictional resistance

-

No noticeable system limitation in EBS

41-89

No CAN message "ETC2" received within a
specified period of time from the AS Tronic in
relation to the engaged gear

-

No noticeable system limitation in EBS

41-91

Unacceptable vehicle speed information via V-
CAN from tachograph compared with the
information from the sensors in the VSC module
(F702)

-

VSC system deactivated

42-16

EBS unit does not receive a correct CAN
message from the rear axle modulator (D978) on
pins B1 and B4

-

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

42-61

Interrupted CAN communication with the rear
axle modulator (D978) via pins B1 and B4 of the
EBS unit due to:
-

short circuit to earth on pin B4 of the EBS
unit

-

short circuit to supply on pin B1 and/or pin
B4 of the EBS unit

-

short circuit between pin B1 and pin 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

43-61

CAN communication problem with the drawn
vehicle ECU via pins B3 and B6 of the ECU

-

No noticeable system limitation in EBS

43-63

Interrupted CAN communication, with a driving
combination, with the drawn vehicle ECU via pins
B3 and B6 of the ECU due to:
-

interruption on pins B3 and B6 of the EBS
unit

-

short circuit between pin B3 and pin B6 of
the EBS unit

-

No noticeable system limitation in EBS

43-75

Interrupted CAN communication, with a driving
combination, with the drawn vehicle ECU via pin
B3 (CAN-H) of the ECU due to:
-

interruption on pin B3 of the EBS unit

-

short circuit on pin B3 of the EBS unit

-

No noticeable system limitation in EBS

Fault code

Fault code description with possible cause

Symptom