1998 VOLKSWAGEN JETTA check engine

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Function
As the control modules are interconnected with
a data bus wire, always start troubleshooting by
the Diagnostic Trouble Code (DTC) memories
of all the control modules in the vehicle.
This occurs in "Automatic test sequence" and is
activated with key function 00.
When doing this, check to see if there are
DTCs stored which may influence the ABS.
The On Board Diagnostic (OBD) relates to the
electrical/electronic part of the ABS, in other
words only malfunctions via the electrical
connection to the control module are
recognized (e.g. speed sensor open circuit).
The 47 pin ABS Control Module (w/EDL) -J104-
forms with the hydraulic unit a compact unit.
The unit is located on the left of the engine
compartment. The control module is equipped
with a DTC memory. The Data Link Connector
(DLC) is located in the center console below
the heating/air conditioning controls.
The control module recognizes malfunctions
during vehicle operation and stores them in a
permanent memory, the contents of which
remain even during periods of no battery
voltage.
Стр. 2из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Sporadic (irregular) malfunctions will also be
recognized and stored. But if malfunctions
affecting the data bus system do not occur again
within the next 15 vehicle start and driving off
sequences, or other malfunctions within the next
50 vehicle start and driving off sequences, they
will be erased from DTC memory except for the
malfunction "Control module faulty" (forget-
malfunction counter).
After switching on the ignition and/or starting the
engine, the ABS warning light -K47- and the ESP
control lamp -K155- will light up for approx. 2
seconds.
During this period a test sequence (self-check) is
run in the control module for the following
functions:

To check if the supply voltage is at least 10.0
Volt,

To check control module including the valve
windings,

To check the coding of the control module,

A static check of the speed sensor (no speed
signal),

If the wheel speed signal is not OK after the car
has been driven and a speed of approx. 20
km/h (approx. 13 mph) has been exceeded, the
ABS warning light -K47- will light up again.
Стр. 3из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Features of 4MOTION
In order to utilize the engine's maximum
performance for a test, e.g. on a rolling road
test bed, the longitudinal acceleration sensor -
G251- must be switched off Page 01
-264 ,
Initiating basic setting, Display group number
040.
Switch ignition off and on again to reactivate
the longitudinal acceleration sensor -G251-.
All-wheel drive vehicles with a Haldex coupling
are equipped with EDL (Electronic Differential
Lock).

Special detail for bleeding brake systems
with ABS/EDL
If a chamber in the brake fluid reservoir has run
empty, basic setting must be performed for
bleeding the brakes Page 01
-264 .

V.A.G 1551 scan tool or tester VAS 5051
The On Board Diagnostic must be initiated at
the commencement of troubleshooting.
Electrical malfunctions which influence the
braking characteristics will be stored.
They can be checked with the V.A.G 1551
Scan Tool, Vehicles system tester V.A.G 1552
or Vehicle Diagnosis, Testing and Information
System VAS 5051.
The program card in the V.A.G 1551 must be at
least version 9.0 and in vehicle system tester
V.A.G 1552, at least version 6.0.
Стр. 4из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Safety precautions and fundamental
points regarding troubleshooting


Note:

The ABS is a vehicle safety system; the
appropriate knowledge is necessary to work on
the system.

In order to check complaints and to be able to
carry out pin-pointed troubleshooting, the
Diagnostic Trouble Code (DTC) memory must
be checked before commencing work on the
ABS system.

Only separate connectors when the ignition is
switched off.

Observe the appropriate instructions regarding
the handling of brake fluid.
Repair Manual, Brake System, Repair Group
47
ABS malfunctions are indicated by the ABS
warning light illuminating. Certain malfunctions
will only be recognized at speeds above 20
km/h (approx. 13 mph) (carry out road test).

If the ABS -K47- and the brake system -K118-
warning lights do not illuminate, but the brake
system is not functioning correctly then the
malfunction must be sought in the conventional
braking system.
Repair Manual, Brake System, Repair Group
45
Стр. 7из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Troubleshooting with V.A.G 1551 scan tool or tester VAS 5051 on ABS Mark 60
(flow chart)




Start
Connect V.A.G 1551 Scan Tool and
select 1-rapid data transfer

or Connect tester VAS
5051 and select
vehicle self-
diagnosis




Compare control
module
identification
Select address word 03-Brake
electronics







Check DTC memory
02







Correct DTCs using DTC table No DTCs
recognized









Read measured
value block 08 Perform output Diagnostic
Test Mode (DTM) 03












Replace
comp.

1. Perform test drive at more than 20
km/h





2. Check DTC memory 02 again





3. "No DTCs recognized" is
displayed again








A B
C
D
E
Стр. 9из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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A B
C
D

E
















Perform directed
entry of electrical
tests Service
hydraulic/mechanical
parts of brake system (
Repair Manual Brake
System)

























1.
Perform all test steps
of electrical checks
from Page 01
-288

Identification not OK.




2. Service
hydraulic/mechanical
parts of brake system




( Repair Manual
Brake System)
Replace control module











- Connect V.A.G 1551 scan tool or tester VAS 5051 and check DTC memory
02.

- Erase DTC memory (05)

- Perform test drive at more than 20 km/h (13 mph) and allow the ABS regulate
braking.

- Check DTC memory after test drive. If "No DTC recognized" appears on
display of V.A.G 1551 scan tool or tester VAS 5051 after repair DTCs and
perform test drive, the On Board Diagnostic (OBD) is completed.







Стр. 10из 10 ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Electrical/electro
components and
installing locatio
Repair Manual, Brake
System, Repair Group 45;
Hydraulic unit, brake
booster/master cylinder -
Assembly overview; Rem
o
and installing control modu
and hydraulic control part 1 -
ABS hydraulic unit
N55-

Located on left of
engine compartm
e
The ABS hydraulic
pump -V64- and th
inlet/outlet valves i
hydraulic unit are
checked by On B
o
Diagnostic (OBD)

The ABS hydraulic
pump -V64- and va
block must not be
separated from o
n
another

Removing and
installing
When changing th
hydraulic unit, alw
a
seal the old part w
the plugs from the
repair set Part No.
698 311 A
Стр. 1из 17 Electrical/electronic components and installing locations

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Vehicles with
ABS/ESP only 2 -
ABS Control
Module
(w/EDL) -
J104-

Location: on
hydraulic unit
on left of
engine
compartment

Checked by
On Board
Diagnostic
(OBD)

Checking the
multi-pin
connector to
control
module
Page 01
-292
Do not
disconnect
connector
before
successfully
completing
On Board
Diagnostic
(OBD).
Switch
ignition off
before
separating
connection.

When the
ABS Control
Module
(w/EDL) -
J104- is
replaced, a
zero
compensation
must be
performed
Стр. 2из 17 Electrical/electronic components and installing locations