DAF LF45, LF55 Series. Manual — part 8

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1

Contents

UPEC

DAVIE XD diagnostics manual

2

2 UPEC

CONTENTS

Page

Date

1.

1.2

2.

2.2

3.

3.2

3.3

UPEC

2

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Contents

2

DAVIE XD diagnostics manual

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1-1

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

1. UPEC 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.

UPEC

1-2

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UPEC fault codes

2

DAVIE XD diagnostics manual

1.2 EXPLANATORY NOTES TO UPEC FAULT CODES

Fault code

Fault code description with possible cause

Symptom

11-1

Internal communication fault in ECU

-

Engine stalls and/or engine starts but does
not fire

11-2

Internal communication fault in ECU

-

Engine stalls and/or engine starts but does
not fire

12-1

Internal fault in ECU due to:
-

defective EEPROM

-

No noticeable system limitation in UPEC

13-1

Internal fault in ECU during the checking
procedure after the ignition was switched off

-

No noticeable system limitation in UPEC

13-2

Internal fault in ECU during the checking
procedure after the ignition was switched off

-

No noticeable system limitation in UPEC

13-4

Internal fault in ECU during the checking
procedure after the ignition was switched off

-

No noticeable system limitation in UPEC

13-8

Internal fault in ECU during the checking
procedure after the ignition was switched off

-

No noticeable system limitation in UPEC

14-1

Voltage on pin B15 but no voltage on pins B3 and
B4 of the ECU due to:
-

faulty relay G126

-

no activation of relay G126

-

no supply voltage on relay G126

-

open connection to pin B27

-

short circuit to supply on pin B27

-

Engine stalls and/or engine starts but does
not fire

-

Communication fault with DAVIE so that
fault code cannot be read out

-

Several systems will output error messages
in connection with the CAN communication

15-1

Internal fault in ECU

-

No noticeable system limitation

21-8

Voltage on pins B3 and B4, with no voltage being
applied anymore on pin B15 of the ECU due to:
-

faulty relay G126

-

short circuit to earth on pin B27

-

short circuit to supply on pin B3 and/or B4

-

Engine starts but will not fire

-

Communication fault with DAVIE so that
fault code cannot be read out

-

Several systems will output error messages
in connection with the CAN communication

22-1

Voltage on pins B3, B4 and B15 of the ECU is too
high (>30 V) due to:
-

excessive alternator/battery voltage

-

inductive voltage of external component

-

System response depending on voltage
level

22-2

Voltage on pins B3, B4 and B15 of the ECU is too
low (<14 V) due to:
-

insufficient supply voltage, for example
during starting

-

contact resistance in power supply circuit

-

System response depending on voltage
level

22-4

Internal supply voltage fault in ECU

-

System response depending on internal
supply voltage fault

31-1

Short circuit to supply on pump unit connections,
pin A24 and/or pin A25 of the ECU

-

Engine stalls and/or engine starts but does
not fire