Volkswagen Golf / Golf GTI / Jetta. Manual — part 352

01-70

Checking brake light switch for
ABS and ABS/EDL function

Display group number 003

- Press keys 0, 0 and 3

- Confirm entry with key Q.

Read measured value block

3

1

2

3

4

There are always 4 display zones -

arrows- in the measured value block.
Decoding the individual values in
display zones 1 to 4 can be read
from the following tables.

Read measured value block

3

0

Indicated on display

Press C key for the next display
group number entry.

If the

key is pressed, keys 0 and

8 for work sequence "Read
measured value block" must be
pressed again afterwards to regain
entry.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-71

Read measured value block

3

Display group number: 003

0

Indicated on display

Vacant

Vacant

Vacant

Brake light switch:

If despite pressed foot brake a -0-, or not pressed foot brake a -1- is displayed
on the V.A.G 1551 display; perform test step No. 4 of Electrical check,

Page

01-102

.

There is also a possibility that the brake light switch has not been correctly
adjusted. Adjusting brake light switch,

Page 01-131

.

0

Brake pedal not depressed

1

Brake pedal depressed

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-72

Checking data bus wiring

Display group number 125

- Press keys 1, 2 and 5

- Confirm entry with key Q.

Read measured value block 125

1

2

3

4

There are always 4 display zones -

arrows- in the measured value block.
Decoding the individual values in
display zones 1 to 4 can be read
from the following tables.

Read measured value block

125

Engine 1 4WD 1 Gear. 1

Indicated on display: (vehicle

stationary)

Press C key for the next display
group number entry.

If the

key is pressed, keys 0 and

8 for work sequence "Read
measured value block" must be
pressed again afterwards to regain
entry.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-73

Read measured value block 125

Display group number: 125

Engine

1

AWD

1

Gear.

1

Indicated on display (example)

Vacant

Data bus connection for transmission

1)

1

Data bus connection is available.

0

Data bus connection is not available.

3)

Data bus for all-wheel drive

2)

1

Data bus connection is available.

0

Data bus connection is available.

Data bus for engine

1

Data bus connection is available.

0

Data bus connection is not available.

1)

Vehicles with automatic transmission only.

Incorrect transmission control module or incorrect transmission control module

coding.

Transmission control module faulty.

Repair Group 01 for relevant transmission code.

2)

All-wheel drive vehicles with Haldex coupling only.

3)

Data bus connection is interrupted or data bus wires are interchanged.

Electrical Wiring Diagrams, Troubleshooting & Component Locations binder.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program