check engine VOLKSWAGEN JETTA 1998 Service Manual

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List of selectable functions

Page
00
- Automatic test sequence Page
01-169
01
- Check control module version
Connecting V.A.G 1551 scan
tool and selecting function Page
01-163
01
- Check control module version
Connecting tester VAS 5051 and
selecting function Page
01-31
02
- Check Diagnostic Trouble Code
(DTC) memory Page
01-170
03
- Output Diagnostic Test Mode
(DTM) Page
01-74
04
- Initiate basic setting Page
01-264
05
- Erase DTC memory Page
01-230
06
- End output Page
01-230
07
- Code control module Page
01-232
08
- Read measured value block Page
01-240
11
- Login procedure Page
01-287
Стр. 10из 129 On Board Diagnostic (OBD), performing

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Automatic test sequence

The automatic test sequence checks all the
Diagnostic Trouble Codes (DTC) memories of
the control modules.

- Switch on ignition.
V.A.G - On Board Diagnosic HELP
1 - Rapid 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 to enter "Check
automatic test sequence" function.
- Confirm entry with Q key.
032906026BI 1.6l R4 MONO 1.3 D1 TEV
Codin
g 00002 WSC XXXXX
The V.A.G 1551 scan tool will show the engine
control module identification is displayed first e.g.
Thereafter all control module identifications with
eventual DTC memory entries are displayed.
Стр. 11из 129 On Board Diagnostic (OBD), performing

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Diagnostic Trouble Code (DTC)
memory, checking


Note:
All functions which could previously be
performed with V.A.G 1551 can now also
be carried out with the 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 recognized! The number of stored DTCs or "No DTC
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
malfunction according to DTC table,
Page 01
-189 .
As with "No DTC recognized", the
program returns to the start position after
pressing the key:
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Rapid data transfer HELP
Select function XX Indicated on display:
Work sequence if a DTC has been
recognized:
1. Repair malfunction according to DTC
table, Page 01
-189
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 - End output (Function 06) Page 01
-
230 .
- Switch off ignition and unplug diagnostic
connector.
Стр. 13из 129 On Board Diagnostic (OBD), performing

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Output Diagnosic Test Mode (DTM)

Note:

All functions which could previously be
performed with V.A.G 1551 can now also be
carried out with the tester VAS 5051.

The pump motor and the correct functioning of
the hydraulic circuits (allocation of brake lines to
wheel cylinders and function of valves) can be
checked via the output DTM for interchange or
leaks.

The vehicle must be raised until all wheels are
free to turn. (2nd mechanic required to rotate
wheels)

The -C- key can be used to exit the test
sequence at any time.

After depressing the brake pedal several times
the vacuum in the brake booster will be
exhausted. Therefore more pressure must be
applied to the brake pedal in order to attain the
same fluid pressure in brake system, as that
attained with vacuum.

When vacuum in brake booster is exhausted it
can happen that the wheels do not lock; start
engine and build-up vacuum in brake booster.
Стр. 14из 129 On Board Diagnostic (OBD), performing

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Example:
Indicated on V.A.G 1551 display during Output
DTM:
(e.g. front left wheel, FL)

Output Diagnosic Test Mode -
IFL: VBAT OFL: 0V Wheel FL locked
IFL = Inlet valve Front Left
VBAT = Voltage Battery; Voltage at valve
OFL = Outlet valve Front Left
0V = 0 Volt; No voltage at valve
Locked/free = Wheel condition; must be
checked by 2nd mechanic if required

Output Diagnosic Test Mode -
EDL valves/Hyd-P: VBAT Wheel FL/FR
locked
Hydr-P = Hydraulic pump
Стр. 15из 129 On Board Diagnostic (OBD), performing

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-
Press key.

The ABS warning light -K47- goes out.
Function is unknown or
cannot be carried out at the moment
Indicated on display
The final control diagnosis is completed
-
Press key.
Rapid data transfer HELP
Select function XX Indicated on display
Note:
There is a malfunction in the system if
the ABS warning light -K47- does not go
out.
Adhere exactly to test sequence: First
check DTC memory, then erase.
- End output (Function 06) Page 01
-
231 .
Стр. 30из 129 On Board Diagnostic (OBD), performing

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Diagnostic Trouble Code (DTC) table
Note:

When beginning On Board Diagnostic (OBD) troubleshooting 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 (w/EDL) -J104-
and printed-out on V.A.G 1551 or VAS 5051, are listed on the following pages according to
the 5 digit DTC code.

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


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

The 5 digit P code which may appear next to the DTC code, is for use with the On Board
Diagnosis (OBD) 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 tool or the
VAS 5051 and erase.

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

After the road test check DTC memory again.
Стр. 31из 129 On Board Diagnostic (OBD), performing

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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
-288 .
00003
Fault number:
00003 / literature ABS Control Module (w/EDL) -
J104- malfunction
Repair Manual, Brake System,
Repair Group 45 - Replace ABS Control Module
(w/EDL) -J104-
Стр. 32из 129 On Board Diagnostic (OBD), performing

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V.A.G 1551 print-
out Possible cause
Repair
00283
Left front ABS
wheel speed
sensor -G47-
1)
Electrical
malfunction in
current circuit
Open circuit in wiring between
left front ABS wheel speed
sensor -G47- and ABS control
module (w/EDL) -J104-
Repair Manual, Brake System,
Repair Group 45; Removing and
installing parts of ABS system on
front and rear axles - Check wiring and connections
using wiring diagram
- Perform electrical check Page
01-288
- Read measured value block
Page 01
-240 Display group number
001
If the malfunction occurs again:

Left front ABS wheel speed
sensor -G47- faulty
Repair Manual, Brake System,
Repair Group 45 - Replace left front ABS wheel
speed sensor -G47-
1) This DTC is recognized when vehicle is stationary.
Стр. 33из 129 On Board Diagnostic (OBD), performing