Volkswagen Golf / Golf GTI / Jetta. Manual — part 255

28-40

Misfire detection, checking

Special tools and equipment

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with the VAS
5051.

Test requirements

VAG 1551 Scan tool (or VAG

1552 Scan tool) with VAG 1551/3
adapter cable

The fuses must be OK.

The battery voltage must be at

least 11.5 V.

Engine mechanically OK.

No DTCs must be stored in DTC

memory

Page 01-23

.

Ignition system, servicing

28-41

Test sequence

- Test drive vehicle.

Observe the valid safety precautions when
performing a road test

Page 28-12

.

- Connect VAG 1551 Scan tool (or VAG 1552)

and select engine electronics control module
with "Address word" 01. Engine must be running
at idling speed: (Connecting scan tool and
selecting engine electronics control module

Page 01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -8- for function "Read

measured value (data) block" and confirm entry
with -Q- button.

Read measured value block

Input display group number XXX

Indicated on display:

- Press buttons -0-, -1- and -4- for "Display group

number 14" and confirm entry with -Q- button.

Read measured value block 14

1

2

3

4

Indicated on display: (1 to 4

display zones)

Ignition system, servicing

28-42

- Check misfire detection status in display zone

4.

Specification: "activated"

- Check total number of misfires in display zone

3.

Specification: 0

If the specifications are obtained:

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

If the specifications are not obtained:

- Change to display group 15 as follows:

- Press button 3 ((VAG 1551) or button (VAG

1552).

Read measured value block 15

1

2

3

4

Indicated on display: (1 to 4

display zones)

Ignition system, servicing

28-43

- Check misfire detection status in display zone

4.

Specification: "activated"

- Check display zones 1 to 3 for detected misfires

in cylinders cylinders 1 to 3.

Specification: 0

If the specifications are not obtained:

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

Evaluating display group 15 and display group
16,

Page 01-207

.

If the specifications are obtained:

- Change to display group 16 as follows:

- Press button 3 ((VAG 1551) or button (VAG

1552).

Read measured value block 16

1

2

3

4

Indicated on display: (1 to 4

display zones)

Ignition system, servicing