audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Renewing diesel direct injection system control unit J248 > < Checking spray pattern of injectors and checking for leaks

A4 Mk1

Wiring and component check with adapter V.A.G 1598/30 or V.A.G 1598/31
Wiring and component check with adapter -V.A.G 1598/30- or -V.A.G 1598/31-
  Note
t  The adapters (test boxes) are designed so that they can be connected to the wiring harness for the engine control unit and to the engine control unit itself at the same time.
t  The advantage of this is that the electronic engine control system remains fully functional when the test adapter is connected (for example, for measuring signals when the engine is running).
t  The relevant test procedure will state whether it is necessary to also connect the engine control unit to the test adapter.
t  Always use auxiliary measuring set -V.A.G 1594C- to connect test equipment (e.g. voltage tester -V.A.G 1527B-, hand-held multimeter -V.A.G 1526C- etc.).
–  Switch off ignition.
–  Pull off rubber seal towards the front -arrow-.
   
–  Detach plenum chamber cover -1- towards the front.
  A02-0021
–  Remove cover of protective housing for control units.
  A10-0761
–  Carefully lever off retaining strap with a screwdriver -arrow-.
–  Release catches and unplug control unit connectors.
  WARNING
To prevent damage to the electronic components, select appropriate measuring range before connecting the measuring cables and observe the test requirements.
Depending on the type of control unit installed:
  N28-0123
–  Connect test adapter -V.A.G 1598/30- to wiring harness connector. The instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test adapter.
  A23-0069
–  Connect test adapter -V.A.G 1598/31- to wiring harness connector. The earth clip on the test adapter must be connected to the negative battery terminal. The instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test adapter.
–  Carry out test as described in appropriate repair procedures.
Perform the following after reconnecting engine control unit:
–  Interrogate and, if necessary, erase fault memory.
  A24-0137

Renewing diesel direct injection system control unit J248 > < Checking spray pattern of injectors and checking for leaks