Ford Fiesta (2011 year). Manual — part 109

The test device has six different channels for noise
diagnosis. This means that six microphones
equipped with clamps can be attached to different
components on the vehicle. The emitted or
transmitted solid-borne sound will be transferred
from microphone to the headphones. There is an
amplifier between the microphone and the
headphones at which the signal strengths and the
corresponding channel can be set.

Only the noises from one microphone are
transferred to the headphones. Each channel is
color-coded on the clamp, cable and amplifier.

NOTE: In order to be able to relate the positions
of the different microphones during the test
process, they are entered in a special test sheet
according to their colors. Microphones, clamps and
cables must be carefully routed and attached.

Test process (example for transmission noise):

• Attach microphones to various positions on the

transmission or mountings. This first allows the
source of the noise to be determined, and then
the possible transfer routes.

• A road test can be performed after all the

clamps have been attached to the vehicle and
all the cables connected to the amplifier.

• Firstly, all the channels are switched through

one after the other in neutral, to check the
operation of the different channels as well as
the noise level in neutral.

• During the road test, all channels are listened

to in the different gears, engine speeds, vehicle
speeds and loads. This procedural method
permits unambiguous diagnosis of the cause of
the noise and the route of the noise until it
enters the bodywork structure.

• The characteristics of the noise which is the

cause of the concern should match those of the
noise which is heard. This means compare the
sound.

• Depending on the input signal level, there may

be a great deal of difference in the noise level
in the individual channels.

• Always set the amplifier volume to zero before

switching to another channel.

• In order to be able to make any comparisons,

the volume settings of the different channels
must be recorded on the test sheet.

G468076en

501-25-

90

Body Repairs - General Information

501-25-

90

DESCRIPTION AND OPERATION

201

SECTION 501-26 Body Repairs - Vehicle Specific
Information and Tolerance Checks

PAGE

CONTENTS

DESCRIPTION AND OPERATION

501-26-2

Body and Frame (Component Location). . . . . . . . . . . . . . . . . . .

501-26-7

Body and Frame (Overview). . . . . . . . . . . . . . . . . . . . . . . ...

501-26-7

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

501-26-7

High-strength and super-high-strength steels. . . . . . . . . . . . . . . . .

501-26-8

Usibor steel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

501-26-9

Crash elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

501-26-11

Sheet metal parts for quarter panel partial replacement. . . . . . . . . . . . .

501-26-12

Anti-corrosion protection. . . . . . . . . . . . . . . . . . . . . . . . . .

501-26-14

Laser weld seams on the front side members. . . . . . . . . . . . . . . . .

GENERAL PROCEDURES

501-26-15

Underbody Tolerance Check. . . . . . . . . . . . . . . . . . . . . . . ..

501-26-17

Frame Tolerance Check. . . . . . . . . . . . . . . . . . . . . . . . . .

501-26-

1

and Tolerance Checks

501-26-

1

.

VEHICLE APPLICATION: