1998 VOLKSWAGEN JETTA check engine light

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Warning!
DTC memor
y was not interrogated.
Indicated on display
Note:
Adhere exactly to test sequence: First
check DTC memory, then erase
2. Ending output
- Press keys -0- and -6-, to end output.
Rapid data transfer Q
06 - End output Indicated on display
- Confirm input with Q key.
Rapid data transfer HELP
Select function XX Indicated on display
ABS warning light -K47- and warning light
for brake system -K118- must go out after
approx. 2 seconds. - Switch ignition off.
- Disconnect V.A.G 1551 Scan Tool at
Data Link Connector (DLC).
- Switch ignition on.
Стр. 37из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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Checking brake light switch for ABS and
ABS/EDL function

Display group number 003

- Press keys 0, 0 and 3

- Confirm entry with key Q.
Read measured value block
3
1 2 3 4
There are always 4 display zones -arrows-
in the measured value block. Decoding the
individual values in display zones 1 to 4 can
be read from the following tables.
Read measured value block 3
0
Indicated on display
Press C key for the next display group
number entry.
If the key is pressed, keys 0 and 8 for
work sequence "Read measured value
block" must be pressed again afterwards to
regain entry.
Стр. 50из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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Read measured value block
3 Display group number: 003
0
Indicated on display

Vacant

Vacant

Vacant

Brake light switch:
If despite pressed foot brake a -0-, or not pressed foot brake a -1- is displayed on the
V.A.G 1551 display; perform test step No. 4 of Electrical check, Page 01
-102 .
There is also a possibility that the brake light switch has not been correctly adjusted.
Adjusting brake light switch, Page 01
-131 .
0 Brake pedal not depressed
1 Brake pedal depressed
Стр. 51из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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-
Press key.
The ABS warning light -K47- goes out.
Function is unknown or
cannot be carried out at the moment
Indicated on display
The Output Diagnostic Test Mode (DTM) is
completed
-
Press key.
Rapid data transfer HELP
Select function XX Indicated on display
Note:
There is a malfunction in the system if
the ABS warning light -K47- does not go
out.
Adhere exactly to test sequence: First
check Diagnostic Trouble Code (DTC)
memory, then erase.
- End output (Function 06) Page 01
-56 .
Стр. 70из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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Test requirements

Switch ignition and electrical
consumers off before beginning the
check (headlights, lighting, fan ...).

Fuses S9, S13, S178 and S179 must
be OK (remove fuses from fuse holder
to check).

Removing air cleaner
- Pull connector -2- off mass air flow
sensor.
- Release spring-type clip -1- on air duct
hose with pliers V.A.G 1921 and pull
hose off air cleaner.
- Remove air cleaner bolts -3- and take
out air cleaner -4-.
Стр. 3из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Contact
Wiring connection to component ...
13
Longitudinal acceleration sensor -G251-(all-wheel drive vehicles with Haldex
coupling only)
14
Coding bridge to contact 3
15
Longitudinal acceleration sensor -G251-(four-wheel drive vehicles with Haldex
coupling only)
15
ESP Control lamp -K155- activation (vehicles with ABS/EDL/ASR only)
16
ABS warning light -K47- activation
17
Longitudinal acceleration sensor -G251-(four-wheel drive vehicles with Haldex
coupling only)
18
Brake light switch -F-
19
Right front ABS wheel speed sensor -G45-
20
Right front ABS wheel speed sensor -G45-
21
Vehicles with navigation system only
22
Right rear ABS wheel speed sensor -G44-
23
Right rear ABS wheel speed sensor -G44-
24
Ground point left in engine compartment and Ground connection in engine
compartment wiring harness
25
Voltage supply from battery +
Стр. 7из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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Test step overview
To test component

Voltage supply for ABS hydraulic pump -V64- to ABS control module
(w/EDL) -J104- - Perform test
step 1
Voltage supply for valves in ABS hydraulic unit -N55- to ABS control
module (w/EDL) -J104- - Perform test
step 2
Voltage supply (terminal X) on ABS control module (w/EDL) -J104-
- Perform test
step 3
Function of brake light switch -F-
- Perform test
step 4
Resistance of right front ABS wheel speed sensor -G45-
- Perform test
step 5
Resistance of left front ABS wheel speed sensor -G47-
- Perform test
step 6
Resistance of right rear ABS wheel speed sensor -G44-
- Perform test
step 7
Resistance of rear left ABS wheel speed sensor -G46-
- Perform test
step 8
Voltage signal of right front ABS wheel speed sensor -G45-
- Perform test
step 9
Voltage signal of left front ABS wheel speed sensor -G47-
- Perform test
step 10
Стр. 8из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check

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To test component

Voltage signal of right rear ABS wheel speed sensor -G44-
- Perform test step 11
Voltage signal of rear left ABS wheel speed sensor -G46-
- Perform test step 12
Coding bridge
- Perform test step 13
Voltage supply for V.A.G 1551, T16 connector
- Perform test step 14
Resistance of K wire for On Board Diagnostic (OBD), T16 connector
- Perform test step 15
Function of ABS warning light -K47-
- Perform test step 16
Function of warning light for brake system -K118-
- Perform test step 17
Function of ABS hydraulic pump -V64-
- Perform test step 18
Check of data bus wiring
- Perform test step 19
Activation of longitudinal acceleration sensor -G251-
1)
- Perform test step 20
Function of ESP Control lamp -K155-
- Perform test step 21
1) All-wheel drive vehicles with Haldex coupling only.
Стр. 9из 31 ABS, ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE, electrical check