Removing and installing engine control unit J623 without protective housing — VW

Removing and installing
engine control unit
J623
without protective housing
Note
If engine control unit is to be replaced, connect
Vehicle diagnostic tester
and carry out function
“Renew control unit”
.
Removing
Switch off ignition.
Remove wiper arms and plenum chamber cover.
Remove plenum chamber bulkhead
General body repairs, exterior
Rep. gr.
50
Plenum chamber bulkhead; Removing and installing plenum chamber cover
.
Release and detach front connector
1
from engine control unit.
Lever up catch
2
slightly.
Then push engine control unit out of retainer
arrow
.
Release and detach rear connector from engine control unit.
Installing
Connect and lock rear connector to engine control unit.
Push engine control unit onto retaining plate.
Push locking mechanism
2
towards engine control unit.
Connect and lock front connector
1
to engine control unit.
Install plenum chamber bulkhead
General body repairs, exterior
Rep. gr.
50
Plenum chamber bulkhead; Removing and installing plenum chamber cover
.
Install wiper arms and plenum chamber cover.
Reading and erasing engine control unit fault memory
Special tools and workshop equipment required
Vehicle diagnostic tester
Connect
vehicle diagnostic tester
as follows:
Connect diagnosis cable connector
2
to diagnostic connection in driver footwell.
Start engine and run at idling speed.
Only if engine does not start:
Switch ignition on.
Selecting operating mode:
Press button for
“Vehicle self-diagnosis”
on display.
Selecting vehicle system:
Press button
“01 - Engine electronics”
on display.
The control unit identification with code
2
as well as the vehicle identification number and immobiliser identification number will be indicated in the centre section of the display.
Note
A print-out can be made if required. To do this, press the
“Print”
button.
Selecting diagnostic function:
Press
“02 - Read fault memory”
button on the display.
If no fault is stored in engine control unit,
“0 fault detected”
is displayed.
If faults are stored in the engine control unit, these are listed on the display.
Press
←
button.
Press
“05 - Delete fault memory”
button on the display.
Press
“06 - End output”
function.
Note
If the fault memory was cleared, the readiness code must be generated
vehicle diagnostic tester
“Guided functions”
.