DAF LF45, LF55 Series. Manual - part 5

 

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DAF LF45, LF55 Series. Manual - part 5

 

 

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1-7

EBS fault codes

EBS

DAVIE XD diagnostics manual 

1

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

-

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

-

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.

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 in foot brake valve

-

interruption 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 of the 
EBS unit

-

No noticeable system limitation in EBS

Fault code

Fault code description with possible cause

Symptom

EBS

1-8

©

EBS fault codes

1

DAVIE XD diagnostics manual

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

41-61

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

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

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

Fault code

Fault code description with possible cause

Symptom

©

1-9

EBS fault codes

EBS

DAVIE XD diagnostics manual 

1

41-69

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

communication problem with the tachograph 
(MTCO)

-

K-factor in MTCO incorrect or not there

-

delayed loss of supply voltage on EBS unit 
when switching off ignition (this is a common 
production situation but it has been solved in 
subsequent production versions by the 
addition of relay G426)

-

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

42-16

EBS unit does not receive correct CAN message 
from the rear axle modulator (D879) on pins B1 
and B4 of the 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

42-61

Interrupted CAN communication with the rear 
axle modulator (D879) 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

43-61

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

-

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 EBS unit 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 EBS unit 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

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

51-22

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

-

ABS on front axle deactivated

Fault code

Fault code description with possible cause

Symptom

EBS

1-10

©

EBS fault codes

1

DAVIE XD diagnostics manual

51-23

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

-

ABS on front axle, left deactivated

51-24

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

-

ABS on front axle, left 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

51-26

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

-

ABS on front axle, left deactivated

51-27

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

-

ABS on front axle, left deactivated

51-28

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

-

ABS on front axle deactivated

52-21

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

-

ABS on front axle, right deactivated

52-22

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

-

ABS on front axle deactivated

52-23

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

-

ABS on front axle, right deactivated

52-24

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

-

ABS on front axle, right 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 EBS unit

-

ABS on front axle deactivated

-

EBS pressure control on front axle and 
drawn vehicle deactivated

52-26

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

-

ABS on front axle, right deactivated

52-27

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

-

ABS on front axle, right deactivated

52-28

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

-

ABS on front axle 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

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

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

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

Fault code

Fault code description with possible cause

Symptom

 

 

 

 

 

 

 

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