audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Renewing engine control unitJ623 > < Engine control unit

A5

Wiring and component check with isolator boxes VAS 6606
Wiring and component check with isolator boxes -VAS 6606-
Special tools and workshop equipment required
t  Isolator box, 198-pin -VAS 6606/1-1-
t  Isolator box, 198-pin -VAS 6606/1-2-
t  Isolator box, 198-pin -VAS 6606/1-3-
t  Sheets -VAS 6606/1-1-
t  Sheets -VAS 6606/2-1-
t  Sheets -VAS 6606/3-1-
   
t  Set of cables -VAS 6606/7-1- and -VAS 6606/7-2-
  Note
t  Always make sure that the cables are properly connected.
t  Do not use damaged or worn tools and accessories.
t  Observe operating instructions.
–  Connect both cable sets -VAS 6606/7-1- and -VAS 6606/7-2- to the three isolator boxes -VAS 6606-.
–  Use the following sheets:
t  -VAS 6606/1-1- for isolator box, 198-pin -VAS 6606/1-1-
t  -VAS 6606/2-1- for isolator box, 198-pin -VAS 6606/1-2-
t  -VAS 6606/3-1- for isolator box, 198-pin -VAS 6606/1-3-
  Note
Make sure that all plug-in bridges are inserted completely in all isolator boxes.
–  Connect earth strap to an isolator box and to an earth point on the vehicle.
–  Remove engine control unit → Chapter „Renewing engine control unit -J623-“.
–  Connect engine control unit to cable set -VAS 6606/7-1-.
–  Connect vehicle wiring harness to cable set -VAS 6606/7-2-.
The connection on the engine control unit consists of a large and a small connector.
The large connector has 105 pins and is assigned to the sheets for the isolator box marked „A 1 to A 105“.
The small connector has 91 pins and is assigned to the sheets for the isolator box marked „B 1 to B 91“.
When a push-in bridge is pulled out, the corresponding wiring connection is disconnected.
  Note
t  The „In“ contact -1- (red socket) leads to the engine control unit.
  W00-10858
t  The „Out“ contact -2- (blue socket) leads to the wiring harness.
–  Carry out test as described in appropriate repair procedures.
Installing engine control unit
Installation is performed in the reverse sequence.
–  Make sure you fit protective housing (if fitted) back on engine control unit.
–  Clean threaded holes for shear bolts to remove any residue from locking fluid. This can be done using a thread tap.
–  Always use new shear bolts.
The procedure required after connecting the new engine control unit is described in the Guided Fault Finding or Guided Functions.
  Note
After completion of the Guided Fault Finding routine, the tester will attempt to erase the event memories of all control units. If this is not successful, the remaining faults registered in the memories must be rectified until all faults can be erased.
  A24-10954

Renewing engine control unitJ623 > < Engine control unit