DAF 95XF. Manual — part 175

©

200438

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System inspection with DAVIE XD

AS TRONIC

DAVIE XD diagnostics manual

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2.3 'CLUTCH ACTUATOR' MENU

This test provides an indication of the

performance of the clutch/clutch actuator, and

can best be carried out on a moving vehicle.

The "absolute clutch stroke" is the clutch stroke

from a fully closed to a fully opened position,

expressed in mm.

The "relative clutch stroke" indicates the position

of the clutch in % instead of mm.

The "clutch status" indicates whether at that

moment the clutch is "opened" or "closed" or

whether the clutch "slips".

The above measurements are closely connected.

For instance, the clutch position "closed" is

expressed in mm and %.

A closed clutch gives a relative clutch stroke of

100% in a position between 37 and 60 mm. An

opened clutch gives a relative clutch stroke of

about 0% in a position between 18 and 40 mm.

The clutch position sensor in the clutch actuator

measures the distance from a fully closed to a

fully opened clutch.

Example:

Clutch position/stroke:

fully closed (100%) = 37 mm

fully opened (approx. 0%) = 18 mm

Difference (clutch stroke) = approx. 19 mm

The position of clutch operation components

changes during the service life of the clutch plate.

For this reason the clutch stroke of approx.

19 mm will move along the "operating range" of

the clutch actuator. This is visible by the changing

clutch position (in mm) of the opened and closed

clutch.

The "absolute change-over" is the point at which

the clutch "engages"; depending on tolerances

and wear this point is between 12 and 45 mm.

If the accelerator pedal is not operated, the "low

idling switch" is active.

A number of situations are shown by way of

example:

Neutral
In neutral the clutch is closed; therefore "engine

speed in" and "input shaft speed" have to be

virtually equal.

With a closed clutch the "relative clutch stroke" is

100%; also, the "clutch status" indicates that the

clutch is closed.

If the accelerator pedal is not operated, the "low

idling switch" is active.

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System inspection with DAVIE XD

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DAVIE XD diagnostics manual

Selecting D or R
If D or R is selected, the clutch will open, which is

indicated by the "clutch status" and the "input

shaft speed" which has become 0 rpm.

With an opened clutch the "relative clutch stroke"

is approx. 0%.

If the accelerator pedal is not operated, the "low

idling switch" is still active.

When driving away, the clutch will close and the

engine and input shaft speeds will be virtually

equal.

At the same time the "low idling switch" status will

change to not active.

Selecting Manoeuvering R or Manoeuvering D
Selection of Manoeuvering R or Manoeuvering D

gives the same result as selection of D and R,

until the accelerator pedal is depressed.

The "low idling switch" status changes to not

active and the "clutch status" indicates that the

clutch slips.

Also, the "relative clutch stroke" indicates that the

clutch does not close completely; the stroke will

be between 30 and 50%, depending on the

resistance that has to be overcome.

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200438

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Contents

VIC

DAVIE XD diagnostics manual

4

4 VIC

CONTENTS

Page

Date

1.

VIC FAULT CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200438
1.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 . . . . . 200438

1.2

Explanatory notes to VIC fault codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 . . . . . 200438

2.

VIC CUSTOMER PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200438
2.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 . . . . . 200438

2.2

Explanatory notes to VIC customer parameters, restricted version. . . . . . 2-2 . . . . . 200438

2.3

Explanatory notes to VIC customer parameters, elaborate version . . . . . 2-6 . . . . . 200438

3.

SYSTEM INSPECTION WITH DAVIE XD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200438
3.1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 . . . . . 200438

VIC

2

©

200438

Contents

4

DAVIE XD diagnostics manual