Volkswagen Golf / Golf GTI / Jetta. Manual — part 202

24-62

Test sequence

- 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-, -6- and -2- for "Display group

number 62" and confirm entry with -Q- button.

Read measured value block 62

1

2

3

4

Indicated on display: (1 to 4

display zones)

- Check throttle valve angle from Angle sensor -1-

for throttle drive -G187- at idling stop in display
zone 1

Specification: 3 to 93%

- Check throttle valve angle from Angle sensor -2-

for throttle drive -G188- at idling stop in display
zone 2

Specification: 97 to 3%

Components, checking

24-63

- Depress accelerator slowly to wide open throttle

position and observe angles displayed in display
zones 1 and 2:

Percentage display in display zone 1 must

increase evenly. Full tolerance range 3 to 93% is
not always displayed.

Percentage display in display zone 2 must drop

evenly. Full tolerance range 97 to 3% is not
always displayed.

Note:

The reason why the display in display zone 1

increases and the display in display zone 2
decreases is because the potentiometers
(angle sensors) in the Throttle Valve Control
Module -J338- run in opposite directions.

This means that the voltage of one angle

sensor moves towards 5 volts. (The more the
throttle valve is opened the higher the voltage;
the percentage figure increases).

While the voltage of angle sensor 2 decreases

from 5 volts towards 0 volts. (The more the
throttle valve is opened the lower the voltage;
the percentage figure decreases).

- Press

button.

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

output" and confirm entry with -Q- button.

Components, checking

24-64

- Switch off ignition.

If the display does not indicate as
described:

Checking resistance

- Disconnect 6-pin connector from

Throttle Valve Control Module -
J338- (arrow).

If the specification is not obtained:

- Measure resistance from throttle

valve drive between terminals 3
and 5

Specification: 1.0 to 5.0

- Replace Throttle Valve Control

Module -J338-

Page 24-13

,

item 6 .

- Check DTC memory, repair

malfunctions if necessary and
then erase DTC memory

Page

01-23

.

- Adapt Motronic Engine Control

Module (ECM) -J220- to Throttle
Valve Control Module -J338-

Page 24-182

.

Components, checking

24-65

- 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

.

If the specification is obtained:

- Check voltage supply of Throttle Valve Control

Module -J338- and wiring to control module

Page 24-66

.

- Check Throttle Position (TP) sensor:

Repair Manual, 2.8 Liter VR6 4V Engine

Mechanical, Engine Code(s): BDF; Repair Group
20

If the voltage supply and wiring are OK.:

- Replace Motronic Engine Control Module (ECM)

-J220-

Page 24-173

.

- Check DTC memory, repair malfunctions if

necessary and then erase DTC memory

Page

01-23

.

- Erase learned values and adapt Motronic

Engine Control Module (ECM) -J220- again

Page 24-182

.

Components, checking