DAF LF45, LF55 Series. Manual — part 3

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1

Contents

EBS

DAVIE XD diagnostics manual

1

1 EBS

CONTENTS

Page

Date

1.

1.2

2.

2.2

3.

EBS

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Contents

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DAVIE XD diagnostics manual

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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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EBS fault codes

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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.