Volkswagen Golf / Golf GTI / Jetta. Manual — part 351

01-66

Test sequence and test tables
with measured values

Checking speed sensor
allocation

Display group number 001

- Press keys 0, 0 and 1.

- Confirm entry with key Q.

Read measured value block

1

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

1

0 km/h 0 km/h 0 km/h 0 km/h

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

01-67

Note:

For display group number 001 remember:

The actual wheel speeds are displayed. They serve to check the speed sensor allocation
to the wheel. (The vehicle must be raised and the wheel must be rotated by hand by a
2nd mechanic).

Read measured value block 1

Display group number: 001

0 km/h 4 km/h 0 km/h 0 km/h

Indicated on display: (Example)

Wheel speed at right rear speed sensor

(0 to 255 km/h)

Wheel speed at left rear speed sensor

(0 to 255 km/h)

Wheel speed at right front speed sensor

(0 to 255 km/h)

Wheel speed at left front speed sensor

(0 to 255 km/h)

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

01-68

Checking speed sensor

Display group number 002

- Press keys 0, 0 and 2.

- Confirm entry with key Q.

Read measured value block

2

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

2

255 km/h 255 km/h 255 km/h 255 km/h

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

01-69

Note:

For display group number 002 remember:

The reading of measured value blocks in display group number 002 must be

undertaken when driving off slowly. Then the ABS Control Module (w/EDL) -J104-
will store the first usable voltage signals provided by the speed sensors and display
these as a fixed value in the measured value block.

Read measured value block

2

Display group number: 002

3

km/h

1)

6

km/h

1)

2

km/h

2)

1

km/h

2)

Indicated on display: (when driving off

slowly)

Wheel speed at right rear speed sensor

(0 to 255 km/h)

Wheel speed at left rear speed sensor

(0 to 255 km/h)

Wheel speed at right front speed sensor

(0 to 255 km/h)

Wheel speed at left front speed sensor

(0 to 255 km/h)

1)

If the deviations in display zones 1 and 2 are greater than 6 km/h (approx. 3.75 mph),

the following malfunctions may be present:

2)

If the deviations in display zones 3 and 4 are greater than 2 km/h (approx. 1.25 mph),

the following malfunctions may be present:

Note:

Air gap between speed sensor and rotor may be too wide.

- Check that speed sensor is attached correctly to wheel bearing housing.

Speed sensor or rotor exterior damaged.

- Change damaged component.

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