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Renewing engine electronics control unit > < Renewing injection timing device cover O-ring

A4 Mk1

TDI diesel injection and glow plug system (4-cyl.) 08.99 ä
Servicing Diesel direct injection system
Wiring and component check with test box V.A.G 1598/31
 
W00-0943

Notes:

  • ◆ Test box V.A.G 1598/31 is designed so that it can be connected to the wiring harness for the engine control unit and to the engine control unit itself at the same time.
  • ◆ This has the advantage of enabling the engine management system to remain fully operational even with the test box connected (for example, when testing signals while the engine is running).
  • ◆ The instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test box.
 
A02-0021
  • ◆ Always use adapter set V.A.G 1594A to connect test equipment (e.g. voltage tester V.A.G 1527B, hand-held multimeter V.A.G 1526A etc.).
  • ‒ Switch off ignition.
  • ‒ → Remove rubber seal from the front -arrow-.
  • ‒ Remove plenum chamber cover -1- from the front.
  • ‒ Remove cover for electronics box in plenum chamber.
 
N28-0123
  • ‒ → Carefully lever off the retainer bar with a screwdriver -arrow-.
  • ‒ Release catches and unplug control unit connectors.
Warning!
To prevent damage to the electronic components, switch to the respective measuring range before connecting the measuring cable and observe the test prerequisites.
 
A24-0137
  • ‒ → Connect test box V.A.G 1598/31 to wiring harness connector. Also connect earth clamp on test box to battery negative 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 box.
  • ‒ Carry out test as described in the repair instructions.

Renewing engine electronics control unit > < Renewing injection timing device cover O-ring