Volkswagen Golf / Golf GTI / Jetta. Manual — part 236

24-198

If no malfunctions can be found in
the wiring:

- Connect VAG 1598/31 test box to

control module wiring harness.
Engine Control Module (ECM) -
J220- remains disconnected.

- Check wiring for open circuit

between test box sockets 40 and
41 and air conditioning system
referring to Electrical Wiring
Diagrams.

Wire resistance: max. 1.5

- Check function of air conditioning

system.

- Check DTC memory, repair

malfunctions if necessary and
then erase DTC memory

Page

01-23

.

- Read readiness code

Page 01-

146

. If DTC memory has been

erased or Motronic Engine
Control Module (ECM) -J220- was
disconnected from battery
positive (B+), readiness code
must be generated again

Page

01-149

.

Additional signals, checking

24-199

Signal from Clutch Vacuum
Vent Valve Switch -F36-,
checking

Special tools, materials and
equipment

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with the VAS
5051.

VAG 1551 Scan tool (or VAG

1552) with VAG 1551/3 adapter
cable

VAG 1526 or Fluke 83 Hand

multimeter or VAG 1715
multimeter

VAG 1594 Adapter set

VAG 1598/31 test box

Electrical Wiring Diagrams

Additional signals, checking

24-200

Test requirements

Test sequence

The fuses must be OK.

The battery voltage must be at

least 11.5 V.

All electrical accessories, e.g.

lights and rear window defroster
must be switched off.

If the vehicle is equipped with air

conditioning, this must be
switched off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

- Connect VAG 1551 Scan tool (or

VAG 1552). Then switch ignition
on and select Motronic Engine
Control Module (ECM) -J220- with
"Address word" 01. ((VAG 1551
and Motronic Engine Control
Module (ECM) -J220-, connecting
and selecting

Page 01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -8- for

function "Read measured value
(data) block" and confirm entry
with -Q- button.

Additional signals, checking

24-201

Read measured value block

Input display group number XXX

Indicated on display:

- Press buttons -0-, -6- and -6- for

"Display group number 66" and
confirm entry with -Q- button.

Read measured value block 66

1

2

3

4

Indicated on display: (1...4

display

zones)

If the specifications are not
obtained:

- Observe display in display zone 2

(6th digit from left).

Specification: xxxxx0xx

- Depress clutch pedal fully and

observe values in display zone 2.

Specification: xxxxx1xx

- Press

button.

- Press buttons -0- and -6- for

function "End output" and confirm
entry with -Q- button.

- Switch off ignition.

- Remove cover in footwell (driver's

side).

Additional signals, checking