DAF LF45, LF55 Series. Manual — part 156

©

200505

1

Contents

DIAGNOSTICS

ΛΦ45/55 series

2

1

1 Diagnostics

CONTENTS

Page

Date

1.

TRACTIVE PROBLEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200505
1.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200505

1.2

Acceleration test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 . . . . . 200505

1.3

Acceleration test form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 . . . . . 200505

1.4

Acceleration test using DAVIE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 . . . . . 200505

2.

BE/CE ENGINE, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200505
2.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200505

2.2

Fault-finding table, engine functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 . . . . . 200505

2.3

Fault-finding table, vehicle functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 . . . . . 200505

3.

BE/CE ENGINE COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200505
3.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200505

3.2

Fault-finding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 . . . . . 200505

4.

BE/CE ENGINE LUBRICATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . 200505
4.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 . . . . . 200505

4.2

Fault-finding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 . . . . . 200505

DIAGNOSTICS

2

©

200505

Contents

1

ΛΦ45/55 series

2

©

200505

1-1

Tractive problems

DIAGNOSTICS

ΛΦ45/55 series

2

1

1. TRACTIVE PROBLEMS

1.1 INTRODUCTION

There may be many reasons why a vehicle's

performance is below standard.

Some of these may be mechanical, but some

may be psychological in nature.

It is therefore important to identify the problem

properly.

Try to get as much information as possible from

the customer or driver.

-

When does the vehicle not perform properly?

-

What are the road or weather conditions

when this occurs?

-

What are the vehicle's loading conditions?

-

Is the vehicle not being compared with a

vehicle with completely different

specifications, for instance engine power?

-

Is the vehicle being driven in the correct

engine speed range?

If the answers are unsatisfactory, ask the

customer or driver for facts.

-

Tachograph cards of trips

-

Reliable consumption figures of trips

Following correct identification of the complaint,

vehicle performance can be tested by an

acceleration test.

If the vehicle fails to pass the acceleration test, a

boost pressure curve may be plotted as an aid to

identifying the cause.

Note:

Checking the boost pressure will in general only

make sense after the vehicle has covered at least

20,000 km.

DIAGNOSTICS

1-2

©

200505

Tractive problems

1

ΛΦ45/55 series

2

1.2 ACCELERATION TEST

1.

Use the "Acceleration test form", which is

included in the Workshop Manual.

2.

Do the checks set out under "Before starting

the acceleration test".

Note:

The work described depends on the type of

engine and vehicle.

3.

Establish a test route where the difference

between the measured times in both

directions does not exceed 15%. If the

difference in time exceeds 15%, find another

test route.

4.

Establish the starting and end points on the

selected test route, to ensure that exactly the

same route can be taken in both directions.

Do the entire test at least twice and take the

average time.

5.

Run the drive train at operating temperature

(drive for at least 15 minutes with a loaded

vehicle).

Note:

When switched on, the air compressor, air-

conditioning compressor and fan consume

10 to 15 kW engine power on average.

During the test try to avoid these consumers

being switched on.

6.

Connect DAVIE and follow the instructions

given.

7.

Fully depress the accelerator pedal during

the acceleration test.