check engine VOLKSWAGEN JETTA 1998 Manual Online

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Functional check: ABS hydraulic pump -V64-
Test
step V.A.G
1598
sockets Item
tested
Test conditions
- Additional
operations Specification
Measures for
deviations from
specification
18 - Function of
ABS
hydraulic
pump -
V64-
Ignition switched
off
- Pull hydraulic
pump -V64-
connector T2 off
control module

- Connect Ground to
connector T2/1 and
battery voltage to
connector T2/2 on
hydraulic pump Hydraulic pump
runs without
malfunction (max.
10 secs.) - Perform output
Diagnostic Test
Mode (DTM)
Page 01
-74 .
- Replace control
module.
Hydraulic pump
does not run
Repair Manual,
Brake System,
Repair Group 45 - Replace
hydraulic unit.
Стр. 24из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Switch to measuring range:
Resistance measurement (200 /20 M )
Test
step V.A.G
1598
sockets Item
tested Test conditions
- Additional operationsSpecification
Measures for
deviations from
specification
19 11 +10 Data
bus
wiring
Ignition switched
off

Set to measuring
range 200


- Disconnect multi-pin
connection from a
control module which
is connected via data
bus wiring:

- Connect test box
V.A.G 1598/21

- Check data bus
wiring for open circuit max. 1.5
Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder - Check wiring using
wiring diagram
Test step 19: Continued on next page
Стр. 25из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Continuation of test step 19
Test
step V.A.G
1598
sockets Item
tested
Test conditions
- Additional
operations Specification
Measures for deviations
from specification
19

Set to
measuring
range 20 M

- Remove fuse S9

- Check wiring for
short circuit to
positive or earth




Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder - Check wiring using
wiring diagram
Стр. 26из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Switch to measuring range:
Resistance measurement (200 /20 M )
Test
step V.A.G
1598
sockets Item tested Test conditions
- Additional
operations Specification
Measures for
deviations from
specification
20 -
Longitudinal
acceleration
sensor -
G251- wiring
Ignition switched
off
Select 200
measuring range
- Disconnect
connector for
longitudinal
acceleration sensor -
G251-
- Disconnect multi-pin
connector T25 from
ABS control module
(w/EDL) -J104-
- Connect test box
V.A.G 1598/21

- Check wiring
between multi-pin
connector for
longitudinal
acceleration sensor -
G251- and multi-pin
connector for ABS
control module
(w/EDL) -J104- for
open circuit max. 1.5
Electrical Wiring
Diagrams,
Troubleshooting &
Component
Locations binder - Check wiring
using wiring
diagram
Test step 20: Continued on next
page.
Стр. 27из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Continuation of test step 20
Test
step V.A.G
1598
sockets Item
tested
Test conditions
- Additional
operations Specification
Measures for deviations
from specification


Set to
measuring
range 20 M

- Remove fuse S9

- Check wiring for
short circuit to
positive or Ground




Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations
binder - Check wiring using
wiring diagram
Стр. 28из 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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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