engine VOLKSWAGEN JETTA 1998 Service Manual

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Display group number
Display zone
Designation
004 1 Steering angle sensor
2 Lateral accelerator sensor
3 Sender for rotation rate
4 Vacant
005 1 Brake pressure sensor
2 Vacant
3 Vacant
4 Vacant
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Display group number
Display zone
Designation
006 1
Longitudinal acceleration sensor
1)
2 Vacant
3 Vacant
4 Vacant
125 1 Data bus for engine
2
Data bus for steering angle
2)
3
Data bus for all-wheel drive
1)
4
Data bus for transmission
3)
1) 4MOTION vehicles only
2) ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP 4MOTION
3) Vehicles with automatic transmission only
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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-off 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.
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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...255 km/h)

Wheel speed at left rear speed sensor

(0...255 km/h)

Wheel speed at right front speed sensor
(0...255 km/h)

Wheel speed at left front speed sensor

(0...255 km/h)
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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-off 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.
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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/h1)
2 km/h2)
1 km/h2)
Indicated on display: (when driving off slowly)

Wheel speed at right rear speed sensor
(0...255 km/h)

Wheel speed at left rear speed sensor

(0...255 km/h)

Wheel speed at right front speed sensor
(0...255 km/h)

Wheel speed at left front speed sensor

(0...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 faults 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 faults may be present:
Note:

Air gap between speed sensor and rotor may be too big.
- Check that speed sensor is screwed correctly to wheel bearing housing.

Speed sensor or rotor exterior damaged.
- Change damaged component.
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Checking brake light switch, brake
system warning lamp, ABS warning
lamp and ASR/ESP warning lamp

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-off from the
following tables.
Read measured value block
3
not oper. off off off
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 afterward to
regain entry.
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Read measured value block
3 Display group number: 003
not
oper. off off off
Indicated on display

ASR/ESP warning light
off
on

ABS warning light
1)
off
on

Brake system warning light
1)

off

on

Brake light switch:
If "not oper." is indicated on the V.A.G 1551 display despite foot brake being
depressed or "operated", despite foot brake not being depressed, perform test step
No. 4 of electrical check, Page 01
-288 .
It is also possible that the brake light switch is not correctly adjusted.
Repair Manual, Brake System, Repair Group 46; Brake pedal
- Assembly
overview; Adjusting brake light switch
not oper. Brake pedal not depressed
operated Brake pedal depressed
1) During the diagnosis, ABS warning light -K47- and Warning light for brake system -K118- will
flash.
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Checking steering angle sensor, sensor
for transverse acceleration and sender
for rotation rate
1)

Display group number 004

- Press keys 0, 0 and 4

- Confirm entry with key Q.
Read measured value block
4
1 2 3
- There are always 3 display zones -
arrows- in the measured value block.
Decoding the individual values in display
zones 1 to 3 can be read-off from the
following tables.
Read measured value block
4
0.0 0.0m/s2- 1.26/s
Indicated on display: e.g. (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.
1) For ABS/EDL/ASR/ESP and
ABS/EDL/ASR/ESP 4MOTION only
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Read measured value block
4 Display group number: 004
0.0
0.0m/s2-
1.26 /s
Indicated on display (example)

Vacant

Sender for rotation rate:
Specification when vehicle is stationary:+/- 2.5 /s
Perform electrical check from Page 01-288

Sensor for transverse acceleration:

Specification when vehicle stationary:+/- 1.5m/s2

Specification at full lock at a speed of 20 km/h (13 mph) in a left-hand
curve: the values increase steadily.

Specification at full lock at a speed of 20 km/h (13 mph) in a right-hand
curve: the values increase steadily with a negative (-) sign.

Check lateral acceleration sensor -G200- Page 01-253
Perform electrical check from from Page 01-288

Steering angle sensor:

If the steering angle sensor -G85- is tested during straight-ahead travel, then zero
compensation must also be performed.
1)

Specification at straight ahead 4.5
Perform electrical checks from Page 01-288
- Initiate basic setting Page 01-264 Display group number 060
1) During a test drive with the V.A.G 1551 scan tool or tester VAS 5051 connected and in
"Diagnosis" or "Measured value block", there is no ABS or ESP regulation. The ABS or ESP
warning lights will flash. The OBD of ABS control module (w/EDL) -J104- is terminated when a
speed of 20 km/h (13 mph) is exceeded.
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