Audi Workshop Service and Repair Manuals > A2 > Power unit | Motronic Direct Injection and Ignition System (4-Cyl.) | Mixture preparation system, electronic inj.,Gas | Servicing Motronic injection system | Wiring and component check using test box V.A.G 1598/31

Motronic Direct Injection and Ignition System (4-Cyl.)

Servicing Motronic injection system

Wiring and component check using test box V.A.G 1598/31

Notes:

◆ Use portable multimeter V.A.G 1526 or multimeter V.A.G 1715 and diode test lamp V.A.G 1527 for testing.
◆ Always use auxiliary leads from adapter set V.A.G 1594 for connection of testers to test box V.A.G 1598/31.
◆ Unplugging connectors from engine control unit erases learned values, however content of fault memory is retained.
◆ The test box V.A.G 1598/31 is designed for simultaneous connection to the engine control unit wiring harness and the actual engine control unit.
◆ This has the advantage that the electronic engine management system remains fully operational with the test box connected (e.g. measurement of signals with engine running).
◆ Whether or not the engine control unit is additionally to be connected to the test box is indicated in the appropriate test sequences.

Attention:
So as not to destroy electronic components, select required measuring range before connecting test leads and observe test conditions.

Special tools and workshop equipment required

Connecting test box V.A.G 1598/31

Important: Switch off ignition.

‒ → Connect test box V.A.G 1598/31 to wiring harness connector. Earth clip must be connected to earth.
‒ Perform testing as described in appropriate repair operations.

Vehicle diagnostic, testing and information system VAS 5051 must be used for this purpose.

After reconnecting the engine control unit carry out the following steps:

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