Volkswagen Golf / Golf GTI / Jetta. Manual — part 207

24-82

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.

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

VAS 5024 Assembly tool for

spring-type clips

Electrical Wiring Diagrams

Chilling spray (commercially

available)

Selector lever must be in

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

Components, checking

24-83

Test sequence

Note:

Only gold plated terminals may be used to
service the terminals in the Intake Air
Temperature (IAT) sensor.

- 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 intake air temperature value in display

zone 4.

Specification: approx. ambient temperature

Components, checking

24-84

If the specification is not obtained:

- Check according to following table:

Display

1)

Cause

Continuation of

check

Approx. -
37.0 C

Open circuit or

short to

positive

Page 24-86

Approx.
126.0 C

Short to Ground

(GND)

Page 24-88

1)

If a temperature is displayed which is below

the ambient air temperature of the sensor, check
sensor wiring for transfer resistance. Note when
doing this that sensor may be heated from
external sources, e.g. radiated heat when engine
is not running.

If the specification is obtained:

- Remove intake hose between Mass Air Flow

(MAF) sensor and Throttle Valve Control Module
-J338- (

Page 24-32

, item 16 ) using VAS

5024 assembly tool for spring-type clips.

- Note intake air temperature value in display

zone 4.

Components, checking

24-85

- Spray sensor (arrow) with

commercial chilling agent while
observing temperature value.
Temperature value must
decrease.

- Press

button.

- Press buttons -0- and -6- for

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

- Switch off ignition.

- Replace Mass Air Flow (MAF)

sensor -G70-

Page 24-30

,

item 6 .

- 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