check engine VOLKSWAGEN JETTA 1998 User Guide

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4 -
ABS/EDL and
ABS/EDL/ASR
Control
Module -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
-106
Do not
disconnect
connector
before
successfully
completing
OBD. Switch
ignition off
before
separating
connection.
Стр. 4из 14 Electrical/electronic components and locations

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5 -
Brake light
switch -F-

The brake
light switch is
open in the
rest position;

Adjusting
Page 01
-131
Can be
checked via
read
measured
value block
Page 01
-
61
6 -
Data Link
Connector
(DLC)

Installation
position: in
center
console
below
heating/air
conditioning
controls
7 -
Longitudinal
acceleration
sensor -G251-

All-wheel
drive
vehicles with
Haldex
coupling only
Стр. 5из 14 Electrical/electronic components and locations

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11 -
Right/left
front ABS
wheel speed
sensor -G45-/-
G47-

Checked by
On Board
Diagnostic
(OBD)

Before
inserting the
sensor clean
the inner
surface of
the sensor
mounting
and coat with
lubricating
paste G 000
650

When
connecting
the speed
sensor wire
ensure it is
not twisted in
the wheel
housing

Bolt
tightening
torque - 10
Nm
12 -
Wheel hub
with impulse
rotor for
right/left front
speed
sensors

Rotor and
speed
sensors for
front left and
right-hand
sides are
identical
Стр. 7из 14 Electrical/electronic components and locations

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13 -
Right/left rear
ABS wheel
speed sensor
-G44-/-G46-

Checked by
On Board
Diagnostic
(OBD)

Before
inserting the
sensor clean
the inner
surface of
the sensor
mounting
and coat with
lubricating
paste G 000
650

When
connecting
the speed
sensor wire
ensure it is
not twisted in
the wheel
housing

Bolt
tightening
torque - 10
Nm
14 -
Wheel hub
with impulse
rotor for
right/left rear
speed
sensors

Rotor and
speed
sensors for
left and right-
hand sides
are identical

Removing
and installing
Стр. 9из 14 Electrical/electronic components and locations

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Parking brake indicator light -K14-

Electrical Wiring Diagrams,
Troubleshooting & Component Locations
binder
Vehicles with ABS/EDL
Malfunction: Vehicle has no EDL
function
For this complaint a possible cause may be
the brake light switch -F- is incorrectly
adjusted. Adjusting brake light switch
Page 01
-131 .
Another possible cause may be the brake
light switch -F- is not functioning. The
function can be checked in Read measured
value block Page 01
-61 , display group
number 003.
If the parking brake indicator light -K14-
-3- does not go out after switching the
ignition on, the malfunction may be:
-a- The parking brake is applied.
-b- The parking brake warning light switch -
F9- for the parking brake indicator light -
K14- is faulty or incorrectly adjusted.
-c- There is a wire routing malfunction.
Стр. 14из 14 Electrical/electronic components and locations

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Test requirements

The tires installed to all wheels must be of
the same (approved) size; tires inflated to
prescribed pressure.

Mechanical/hydraulic parts of the brake
system including brake light switch and
brake lights OK.

Hydraulic lines and connections not leaking
(visual check of hydraulic unit, brake
calipers, wheel cylinders, tandem master
brake cylinder).

Wheel bearings and wheel bearing play
OK.

ABS control module (w/EDL) -J104- is
correctly bolted to hydraulic unit -N55-.

Connector on ABS control module (w/EDL)
-J104- correctly plugged-in (retainer is
engaged).

Check contacts of ABS components for
damage and correct seating.

All fuses OK according to wiring diagram
(remove fuse from fuse holder to check).

Supply voltage OK (at least 10.0 V).
Стр. 2из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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V.A.G 1551 Scan Tool, connecting and
selecting function


Note:

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

The ABS function is switched off in the control
module during the On Board Diagnostic (OBD)
.
The Diagnostic Trouble Code (DTC) memory
can be erased after successful checking and
repair.

Connecting VAS 5051 Page 01-31 . - Pull cover -1- off in direction of arrow.
- With ignition switched off connect V.A.G 1551
using cable V.A.G 1551/3(A) to Data Link
Connector
V.A.G - On Board Diagnostic HELP
1 - Ra
pid data transfer1)
2 - Blink code output1)
Indicated on display
1) Is displayed alternately
Note:
If there is no indication on display, check DLC,
Electrical checks Page 01
-102 , test steps 14
and 15.
Depending on the program, additional operating
information can be printed out by pressing the
HELP key of V.A.G 1551.
The key is used for moving forward within
the program.
Стр. 3из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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Control module code (03604).
Coding control module Page 01
-58
Workshop code
V.A.G 1551 Scan Tool operating
instructions
If the control module identification number
does not appear Summary of selectable
functions Page 01
-27

-
Press key.
Rapid data transfer HELP
Select function XX Indicated on display (select function, e.g. 02
- Check DTC memory).
Rapid data transfer HELP
Control module does not answer! Indicated on display
By pressing the HELP key, a list of possible
fault causes is printed out.
If "Control module does not answer!" again
appears: - After eliminating possible causes of
malfunctions, enter the address word 03
for "Brake electronics" again and
confirm.
Rapid data transfer HELP
Control module does not answer! Indicated on display
- Perform test steps 1, 2 and 3 Page
01-102 , Electrical check.
Rapid data transfer
No signal from control module!
malfunctions have occurred during checking
of control module identification (possibly
influenced from external sources?)
Стр. 5из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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- Check DLC as well as voltage supply and
Ground connection for ABS Control Module
(w/EDL) -J104-, Electrical check, Page 01
-
102 .

- After repairing possible causes of malfunction,
again enter address word 03 for "Brake
electronics" and confirm with Q key.
Стр. 6из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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List of selectable functions

Page
00
- Automatic test sequence Page
01-30
01
- Check control module version
Connecting V.A.G 1551 Scan
Tool and selecting functions Page
01-23
02
- Check DTC memory Page
01-28
03
- Output Diagnostic Test Mode Page
01-74
04
- Initiate basic setting Page
01-91
05
- Erase DTC memory Page
01-56
06
- End output Page
01-56
07
- Code control module Page
01-58
08
- Read measured value block Page
01-61
Стр. 7из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program