Audi Workshop Service and Repair Manuals

Notes:

• ◆ The test box V.A.G 1598/31 is designed in such a way that it can be connected simultaneously to the engine control unit wiring harness and to the engine control unit itself.
• ◆ This has the advantage that the electronic motor control system remains fully functional when the test box is connected (for example, for measuring signals when the engine is running).
• ◆ Whether the engine control unit has to be additionally connected to the test box or not is described in the respective test procedures.
• ◆ Always use adapter set V.A.G 1594 A for connecting up measuring instruments (e.g. voltage tester V.A.G 1527 B, hand-held multimeter V.A.G 1526 A etc.)

Special tools, testers and workshop equipment required

• ◆ V.A.G 1598/31

Work sequence

• ‒ Switch off ignition.
• ‒ Pull rubber gasket off front of plenum chamber cover.

• ‒ Detach plenum chamber cover to front.
• ‒ Remove cover for E-box in plenum chamber.
• ‒ → Carefully lever off the retainer bar with a screwdriver -arrow-.
• ‒ Then release connectors on control unit and pull off.

• ‒ → Connect V.A.G 1598/31 test box to connector on wiring harness. The earth clip on the test box (not visible on the figure) has to be connected to the battery negative. Whether or not the engine control unit has to be additionally connected to the test box is described in the respective test procedures.
• ‒ Carry out test as described in the appropriate repair procedures.

Note:

After re-connecting the engine control unit, perform adaption of engine control unit to throttle valve control unit

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