1998 VOLKSWAGEN JETTA Service Manual

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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:
Стр. 12из 129 On Board Diagnostic (OBD), performing

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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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- Connect V.A.G 1551 scan tool.

- Switch on ignition.

- Press key -1- for "Rapid data transfer" operating
mode.

- Select brake electronics control module
(address word 03); Page 01
-165 .
Rapid data transfer Q
03 - Brake electronics Indicated on display:
Note:
During the next work steps the ABS warning light -
K47- flashes. - Confirm entry with key Q.
- Read off control module version in V.A.G 1551
display.
-
Press key.
Стр. 16из 129 On Board Diagnostic (OBD), performing

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Rapid data transfer HELP
Select function XX Indicated on display
- Press keys 0 and 3
Rapid data transfer Q
03 - Out
put Diagnosic Test Mode
Indicated on display
ABS hydraulic pump -V64- must run. - Confirm entry with key Q.
Output Diagnosic Test Mode
-
ABS hydraulic pump - V64
Indicated on display
-
Press key.
Output Diagnosic Test Mode
-
Operate brakes
Indicated on display
- Operate brake pedal.
-
Press key.
Output Diagnosic Test Mode
-
IFL: 0V OFL: 0V Wheel FL locked
Indicated on display
Note:
If the wheel does not lock, there is a
possibility that there is a malfunction in the
mechanical/hydraulic part of the brake
system. - Indicate to 2nd mechanic which wheel
requires turning by hand.
Стр. 17из 129 On Board Diagnostic (OBD), performing

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-
Press key.
Output Diagnosic Test Mode
-
IFL: VBAT OFL: 0V Wheel FL locked
Indicated on display
ABS hydraulic pump -V64- must run.
Brake pedal must not give.
If the brake pedal gives, there is a
malfunction in the hydraulic unit. In this
case the hydraulic unit must be replaced.
Repair Manual, Brake System, Repair
Group 45 -
Press key.
Output Diagnosic Test Mode
-
IFL: VBAT OFL: VBAT Wheel FL free
Indicated on display
Note:
If the wheel locks there is a possibility that
the brake lines to the wheel
calipers/cylinders have been interchanged. - Indicate to 2nd mechanic which wheel
requires turning by hand.
Стр. 18из 129 On Board Diagnostic (OBD), performing