Renewing diesel direct injection system control unit J248 — VW

Renewing
diesel direct injection system control unit
J248
WARNING
As of 01.05, an EU Directive will come into force whereby certain vehicles must be equipped with a speed limiter system.
These vehicles can be recognised by the lead seal on the engine control unit connector
Fig.
and instrument cluster
Fig.
.
Work on these vehicles' engine control units may only be carried out by workshops authorised to do so by Volkswagen AG.
Engine control unit connector lead seal with speed limiter system
A
: Adhesive seal (to be removed by authorised workshops only)
B
: Engine control unit connector (with armored cable)
C
: Engine control unit
Instrument cluster lead seal with speed limiter system
Special tools and workshop equipment required
Fault reader
V.A.G 1551
with
LT diagnostic cable
V.A.G 1551/5B
Procedure
First print out the control unit identification and thereby the previous control unit coding as follows:
Connect
fault reader
V.A.G 1551
and select engine electronics control unit with
“address word 01”
. The ignition must be switched on for this purpose. (Connect fault reader and select engine electronics control unit
Chapter
).
The
fault reader
V.A.G 1551
display will show the control unit identification, e.g.:
2D0906019A 2.8l R4 EDC G001SG 3704 ->
Coding 00002 WSC 00000
Print out the control unit identification by pressing the fault reader
Print
button.
Press
→
button.
Press buttons
0
and
6
for function
“End output”
and confirm entry with
Q
button.
Indicated on display:
Rapid data transfer HELP
Select function XX
Switch off ignition.
Remove centre console
Rep. Gr.
68
Release connector from control unit and pull off.
Unbolt the engine control unit retaining clip.
Remove old control unit and install new control unit.
Install centre console.
Check the previous coding and the coding of the new control unit
Chapter
.
Adapt engine control unit to electronic immobiliser:
Electrical system
Rep. Gr.
01
Self-diagnosis of immobiliser system
Activate cruise control system
Chapter
Activate working speed governor:
Chapter
Adapt working speed governor:
Chapter
Then read the fault memory of the new engine control unit and clear the fault memory if necessary, clearing fault memory
Chapter