DAF LF45, LF55 Series. Manual — part 47
EBS-2
2
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Contents
12
DAVIE XD diagnostics manual
©
1-1
EBS-2 fault codes
EBS-2
DAVIE XD diagnostics manual
12
1. EBS-2 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-2
1-2
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EBS-2 fault codes
12
DAVIE XD diagnostics manual
1.2 EXPLANATORY NOTES TO EBS-2 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
-
VSC system 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
-
VSC system 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
-
VSC system 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
-
VSC system 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 internally switched to earth in the
ECU and in addition the power supply to A9
and E4 is switched off internally.
-
VSC system deactivated
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