Volkswagen Golf / Golf GTI / Jetta. Manual — part 204

24-70

Special tools and equipment

Note:

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

Test requirements

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

Selector lever must be in

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

Engine must be cold.

Components, checking

24-71

Test sequence

Note:

Only gold plated terminals may be used when
servicing the sensor connector terminals.

- 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.

Read measured value block

Input display group number XXX

Indicated on display:

- Press buttons -0-, -0- and -4- for "Display group

number 4" and confirm entry with -Q- button.

Read measured value block 4

1

2

3

4

Indicated on display: (1 to 4

display zones)

- Read coolant temperature value in display zone

3.

Specification: approx. coolant temperature

Components, checking

24-72

If the specification is not obtained:

- Check according to following table:

Display

1)

Cause

Continuation of

check

Approx. -
42.0 C

Open circuit or

short to

positive

Page 24-74

Approx.
136.0 C

Short to Ground

(GND)

Page 24-76

1)

If a temperature is displayed which deviates

greatly from the ambient temperature of the
sensor, check sensor wiring for transfer
resistance.

If the specification is obtained:

- Start engine and run at idle speed. Temperature

value must increase uniformly

Note:

If irregular engine running occurs in certain

temperature ranges and the temperature figure
does not increase without interruption, the
temperature signal is temporarily interrupted and
the sensor must be replaced.

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24-73

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

If the display does not indicate as described:

- Replace Engine Coolant Temperature (ECT)

sensor -G62- / Engine Coolant Temperature
(ECT) sensor -G2-

Page 24-16

, item 14 .

- 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

.

Components, checking