1998 VOLKSWAGEN JETTA warning

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Measured value block, reading

Note:
All functions that have been carried out so far
with V.A.G 1551 can now also be carried out with
the tester VAS 5051.
The control module can transfer a considerable
amount of test data. This test data delivers
information on the operational condition of the
system and/or sensors connected to it. In many
cases the transferred test data supports
troubleshooting and repair. The test data has
been summarized into single display groups
because all the information cannot be evaluated
at the same time. The information can be
selected via display group numbers.

Safety precautions

WARNING!

If the use of test and information devices
during a test drive is necessary, observe the
following:

You must always secure testing and
measuring equipment on the rear seat.

When vehicle is being driven, a second
technician must operate this equipment.
Стр. 82из 129 On Board Diagnostic (OBD), performing

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Overview of selectable display group numbers
Display group number
Display zone
Designation
001 1 Wheel speed at left front wheel sensor (km/h)
2 Wheel speed at right front wheel sensor (km/h)
3 Wheel speed at left rear speed sensor (km/h)
4 Wheel speed at right rear speed sensor (km/h)
002 1 Wheel speed at left front speed sensor (km/h)
2 Wheel speed at right front wheel sensor (km/h)
3 Wheel speed at left rear speed sensor (km/h)
4 Wheel speed at right rear speed sensor (km/h)
003 1 Brake light switch
2 Brake system warning light
3 ABS warning light
4 ASR/ESP warning light
Стр. 84из 129 On Board Diagnostic (OBD), performing

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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.
Стр. 91из 129 On Board Diagnostic (OBD), performing

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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.
Стр. 92из 129 On Board Diagnostic (OBD), performing

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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.
Стр. 94из 129 On Board Diagnostic (OBD), performing

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Read measured value block
6 Display group number: 006
0.0m/s
2

Indicated on display (example)

Vacant

Vacant

Vacant

Longitudinal acceleration sensor:
1)

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

Specification when accelerating forwards: The values increase steadily.

Specification when accelerating in reverse: The values increase steadily
with a negative sign (-).

Check longitudinal acceleration sensor -G251- Page 01-259
Perform electrical check Page 01-288
1) When performing a test drive where the V.A.G 1551 scan tool or tester VAS 5051 is
connected and in diagnosis or read measured value block mode there is no ABS regulation.
The ABS warning light does not light up. The OBD of ABS control module (w/EDL) -J104- is
terminated when exceeding a speed of 20 km/h (13 mph).
Стр. 100из 129 On Board Diagnostic (OBD), performing

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Rapid data transfer HELP
Enter address word XX Indicated on display:
- Press keys 0 and 4. (The function
"Initiating basic setting" is selected with
04).
Rapid data transfer Q
04 - Basic settin
g
Indicated on display:
- Confirm entry with key Q.
Basic setting HELP
Enter displa
y group number XXX
Indicated on display:
- Press keys 0, 4 and 0
- Confirm entry with key Q.
ABS warning light flashes.
Basic setting 40 Indicated on display:
- The longitudinal acceleration sensor -
G251- is now switched off.
- After completing the checks, reactivate
the longitudinal acceleration sensor -
G251- by switching the ignition off and
on again, once.
Стр. 112из 129 On Board Diagnostic (OBD), performing

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Basic setting HELP
Enter dis
play group number XXX
Indicated on display:
- Press keys 0, 6 and 0
- Confirm entry with key Q.
ABS warning light flashes.
Basic setting 60 OFF <4-ON>
Compens. OK.
0.0 And then the display shows e.g.:
Function is unknown or cannot be
-
performed at moment
If this display appears the login procedure
has not been performed successfully.
Стр. 115из 129 On Board Diagnostic (OBD), performing