1998 VOLKSWAGEN JETTA check engine light

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Test table
Notes on test table

The socket designations of adapter V.A.G 1598/21 are identical to the control module -J104
contact designations in wiring diagram.
Electrical Wiring Diagrams, Troubleshooting & Component Locations binder
If the readings obtained deviate from the specifications, carry out repair measure in the
right-hand part of the table.
Electrical Wiring Diagrams, Troubleshooting & Component Locations binder
Continuity checks with adapter set V.A.G 1594 A (bridging).

If the measured figures only deviate slightly from the specifications, clean sockets and
connectors of the testers and adapter cables (with contact spray G 000 700 04 ) and repeat
check. Before replacing components, check wiring and connections and also, particularly for
specifications of less than 10 , repeat resistance check on the component.
Стр. 10из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Switch to measuring range:
Voltage measurement (20 V =)
Test
step V.A.G
1598
sockets Item tested
Test
conditions
- Additional
operations Specification
Measures for
deviations from
specification
3 8 + 4 Voltage supply
(terminal X) to
ABS Control
Module
(w/EDL) -
J104-
Ignition
switched on10.0 to 14.5 V
Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder - Check wire using
wiring diagram
4 8 + 18 Function of
brake light
switch -F- Ignition
switched off
Brake pedal
not
depressed
0.0 to 0.5 V
Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder - Check brake light
switch -F- and Read
measured value
block, display group
003
- Check wiring using
wiring diagram

- Press brake
pedal approx. battery
voltage - Checking brake light
switch -F- Page 01
-
131
Стр. 12из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Functional check: ABS warning light -K47-
Test
step V.A.G
1598
sockets Item
tested
Test
conditions
- Additional
operations Specification
Measures for
deviations from
specification
16 - Function of
ABS
warning
light -K47-
Switch
ignition on ABS warning light -
K47- lights up for
approx. 2 seconds
and goes out again

Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder
Repair Manual,
Body Interior,Repair
Group 70 - Check wiring using
wiring diagram
- Malfunction in
instrument cluster
Стр. 22из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Functional check: Warning light for brake system -K118-
Test
step V.A.G
1598
sockets Item
tested
Test
conditions
- Additional
operations Specification
Measures for
deviations from
specification
17 - Function of
warning
light for
brake
system -
K118-
Brake fluid
level is OK.

Switch
ignition on Warning light for
brake system -
K118- lights up for
approx. 2 seconds
and goes out again
Electrical Wiring
Diagrams,
Troubleshooting &
Component
Locations binder - Check brake fluid
level warning
switch -F34- in
sealing cap

- Pull
connectors off
both front speed
sensors
- Start engine
and run at more
than 2000 rpm Warning light -
K118- lights up and
3 warnings are
sounded
Electrical Wiring
Diagrams,
Troubleshooting &
Component
Locations binder
Repair Manual,
Body Interior,Repair
Group 70 - Check wiring
using wiring
diagram
- Malfunction in
instrument cluster

- Reconnect
connectors to
both front speed
sensors again
- Check DTC
memory and
erase
Стр. 23из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Functional check: ESP Control lamp -K155
Test
step V.A.G
1598
sockets Item
tested
Test
conditions
- Additional
operations Specification
Measures for
deviations from
specification
21 - Function of
ESP
Control
lamp -
K155-
Switch
ignition on ESP Control lamp -
K155- lights up for 2
seconds and goes
out again

Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder
Repair Manual,
Body Interior,Repair
Group 70 - Check wiring using
wiring diagram
- Malfunction in
instrument cluster
Стр. 29из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Brake light switch, adjusting

Vehicle up to my 02.00
Repair Manual, Brake System, Repair
Group 46; Installing brake light switch
Remove brake light switch to adjust.

- Disconnect connector from brake light
switch.
- Remove brake light switch by turning to
left through 90 .
- Pull brake light switch plunger fully out.
- Press brake pedal down as far as
possible by hand.
- Guide brake light switch through
assembly opening and reinstall by
turning 90 to right.
- Release brake pedal.
- Connect brake light switch connector.
- Install driver's side stowage tray if
necessary.
- Operate brake pedal.
Brake lights light up.
- Take foot off brake pedal.
Brake lights do not light up.
Стр. 30из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Vehicle from my 03.00

- Pull out brake light switch plunger to full
extension.

- Keep brake pedal in up position (IMPORTANT!
hold pedal up if necessary while installing
switch).

- Guide switch through mounting hole (only fits in
one position).

- Seat switch fully into opening (pressing plunger
against pedal to adjust.

-
Seat switch by turning it 45 clockwise. This
action also turns the plunger shoe into the
correct orientation to make electrical contracts in
switch operate as well as locks in plunger
adjustment.

- Connect brake light switch connector.

- Operate brake pedal to verify proper function.

- Reinstall lower cover panel.
Стр. 31из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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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