check engine VOLKSWAGEN JETTA 1998 Owner's Manual

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Diagnostic Trouble Code (DTC),
memory

All functions which could previously be
performed with V.A.G 1551 can also be
performed with the new tester VAS 5051.
Rapid data transfer HELP
Select function XX Indicated on display:
- Press keys -0- and -2-; 02 enters the
"Check DTC memory" function.
Rapid data transfer Q
02 - Check DTC memor
y
Indicated on display
- Confirm entry with Q key.
X DTCs recognised! The number of stored DTCs or "No DTCs
recognized" appears in the display.
-
Press key.
The stored DTCs are displayed and
printed out one after the other.
- With DTC information print-out eliminate
malfunctions according to DTC table,
Page 01
-35 .
As with "No DTC recognized", the
program returns to the start position after
pressing the key:
Rapid data transfer HELP
Select function XX Indicated on display
- End output (Function 06) Page 01
-56 .
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- Switch off ignition and disconnect tester at
DLC.
Work sequence if a DTC has been detected:
1. Repair according to DTC table, Page 01
-
35
2. Check DTC memory (Function 02)
3. Erase DTC memory (Function 05)
4. End output (Function 06)
5. Perform a test drive
6. Check DTC memory again
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Automatic test sequence
The automatic test sequence checks all the
Diagnostic Trouble Code (DTC) memories
of the control modules.

- Switch ignition on.
V.A.G - On Board Diagnostic HELP
1 - Ra
pid data transfer1)
2 - Blink code output1)
Indicated on display
1) Is displayed alternately
- Press key -1- for "Rapid data transfer"
operating mode.
- Switch on printer with the Print key
(indicator lamp in key lights up).
Rapid data transfer HELP
Select function XX Indicated on display
- Press key -0- twice; 00 enters "Automatic
test sequence" function.
- Confirm entry with Q key.
1J0 907 379 D ABS 20 IE CAN0001
Coding 03604 WSC XXXXX
The V.A.G 1551 Scan Tool display will
show the control module identification, e.g.:
Thereafter all control module
identifications with eventual DTC
memory entries are displayed
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Note:

The ABS function is switched off in the control
module during the On Board Diagnostic.

The DTC memory can be erased after
successful checking and repair.

Note:
Operating instructions for Vehicle Diagnosis,
Testing and Information System VAS 5051. - Pull cover -1- off in direction of -arrow-.
- With ignition switched off, connect tester VAS
5051 to diagnosis connection using diagnosis
cable VAS 5051/1 or VAS 5051/3.
In the functions 04 - Basic setting/08 - Read
Measured value block, the display zones will b
e
listed from top to bottom.
If the display does not indicate as described in
the work sequence:
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Diagnostic Trouble Code (DTC) table
Note on DTC table:

When beginning OBD of the vehicle control modules, always start with function "Automatic
test sequence" by pressing keys 0 and 0 because the control modules are interconnected
with a data bus wire. This checks the DTC memories of the control modules in the vehicle.

All the possible DTCs which can be recognized by the ABS control module -J104- and
printed-out on V.A.G 1551 or VAS 5051, are listed on the following pages according to the
5-digit DTC.

DTC appears (in the "Rapid data transfer" mode) only on the print-out.
Example:


DTC P code DTC type code
5-digit 5-digit 3-digit
18256 P1848 035

The 5-digit P code which may appear next to the DTC, is for use with the On Board
Diagnostic (OBD) II and may be disregarded.

The 3-digit DTC type code is a data code and may be disregarded, but the DTC type text is
of use.

Before replacing components indicated as being faulty, check all the appropriate
connectors, wiring and Ground connections using the wiring diagram
Electrical Wiring Diagrams, Troubleshooting & Component Locations binder
On completion of repairs always check the DTC memory with V.A.G 1551 Scan Too. or the
tester VAS 5051 and erase.

Carry out road test exceeding 20 km/h (13 mph).

After the road test check DTC memory again.
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V.A.G 1551
print-out Possible cause
Repair
No DTC
recognized If "No DTC recognized" appears after carrying out repairs, On Board
Diagnostic (OBD) is ended.
If, despite "No DTC recognized" appearing in the display, the ABS system
does not function properly, then proceed as follows:
1. Carry out road test exceeding 20 km/h (13 mph),
2. Again check DTC memory, if there is still no DTC stored,
3. Continue troubleshooting without OBD and work through the complete
Electrical check Page 01
-102 .
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01-37


V.A.G 1551
print-out Possible cause

Repair
00283
Left front
ABS wheel
speed
sensor -
G47-
Open circuit, shor
t to positive or
Ground, or loose contact in
connections betwe en left front ABS
wheel speed sens or -G47- and
ABS Control Mo dule (w/EDL) -
J104- - Check wiring and
connections using
wiring diagram
- Perform electrical checks from
Page 01
-102
Damaged rotor or left front ABS
wheel speed sensor -G47

Left front ABS whee l speed sensor
windings -G47- faulty - Check left front
ABS wheel speed
sensor -G47- and rotor for damage
- Replace rotor/speed sensor -G47-
Repair Manual, Brake System,
Repair Group 45; Removing and
installing parts of ABS system on front
and rear axles
If the malfuncti on occurs again:

ABS Control Module (w/EDL) -
J104- faulty
Repair Manual, Brake System,
Repair Group 45; Hydraulic unit, brake
booster/brake master cylinder -
Assembly overview; Removing and
installing control mo dule and hydraulic
unit
- Replace ABS Control Module
(w/EDL) -J104-
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ABS ITT Mk 20 IE On Board Diagnostic (OBD) program
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V.A.G 1551
print-out Possible cause
Repair
00283
Left front ABS
wheel speed
sensor -G47-
Signal outside
tolerances
1)
Open circuit, short to positive or
Ground, or loose contact in
connections between left front ABS
wheel speed sensor -G47- and ABS
Control Module (w/EDL) -J104- - Check wiring and
connections using wiring
diagram
- Perform electrical checks
from Page 01
-102

Electrical interference from other
sources (high frequency radiation e.g.
non-insulated ignition cable) - Read measured value block
Page 01
-61 Display group
number 001

Damaged rotor or left front ABS wheel
speed sensor -G47-


Excessive air gap between left front
ABS wheel speed sensor-G47- and
rotor (signal not OK.)
Repair Manual, Brake
System, Repair Group 45;
Removing and installing parts
of ABS system on front and
rear axles - Check left front ABS wheel
speed sensor -G47- and rotor
for damage
- Replace rotor/speed sensor
1) Type of DTC, this DTC is only recognized above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-
out Possible cause
Repair
00283
Left front ABS
wheel speed
sensor -G47-
Mechanical
malfunction
1)
Excessive air gap
between left front ABS
wheel speed sensor -
G47- and rotor (signal
not OK.) Repair Manual, Brake System, Repair
Group 45; Removing and installing parts of
ABS system on front and rear axles - Check installation of left front ABS wheel
speed sensor -G47- and rotor
- Read measured value block Page 01-
61 Display group number 002
- Perform output Diagnostic Test Mode
(DTM) Page 01
-74
If the malfunction occurs again:

Outlet valve in ABS
hydraulic unit -N55-
faulty Repair Manual, Brake System, Repair
Group 45; Hydraulic unit, brake
booster/brake master cylinder - Assembly
overview; Removing and installing control
module and hydraulic unit - Replace ABS hydraulic unit -N55-
1) Type of DTC, this DTC is only recognized above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551
print-out Possible cause
Repair
00285
Right front
ABS wheel
speed
sensor -
G45-
Open circuit, short to positive or
Ground, or loose contact in
connections between right front
ABS wheel speed sensor -G45-
and ABS Control Module (w/EDL) -
J104- - Check wiring and connections using
wiring diagram
- Perform electrical checks from
Page 01
-102

Damaged rotor or speed sensor -
G45

Speed sensor windings -G45-
faulty
Repair Manual, Brake System,
Repair Group 45; Removing and
installing parts of ABS system on front
and rear axles - Check right front ABS wheel speed
sensor -G45- and rotor for damage
- Replace rotor/right front ABS wheel
speed sensor -G45-
If the malfunction occurs again:


ABS Control Module (w/EDL) -
J104- faulty
Repair Manual, Brake System,
Repair Group 45; Hydraulic unit, brake
booster/brake master cylinder -
Assembly overview; Removing and
installing control module and hydraulic
unit - Replace ABS Control Module
(w/EDL) -J104-
Стр. 20из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program