Connecting VAG 1598/31 Test Box

Wiring and component check with test box VAG 1598/31

NOTE:







- The test box VAG 1598/31 is designed in such a way that it can be connected simultaneously to the engine control module wiring harness and to the engine control module 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 module has to be additionally connected to the test box or not is described in the respective test procedures.
- Use the hand multimeter VAG 1526 or the multimeter VAG 1715 and the diode test lamp VAG 1527 or equivalent for the checks.
- To connect the test devices to the VAG 1598/31 test box, always use auxiliary cables from adapter set VAG 1594.

WARNING: To prevent damage to the electronic components, select the appropriate measuring range before connecting the test leads and observe the test requirements.

Connecting test box VAG 1598/31
- Switch ignition off.
- Remove cover of electronics box for control modules in plenum chamber.

NOTE: If the engine control module has a metal housing (anti-theft protection), the metal housing must be disconnected from the engine control module in order to connect the test box. Procedure. Reinstall metal housing to control module on completion of repairs.







- Carefully pry off retainer bar with a screwdriver -arrow-.
- Release connectors on control module and disconnect.







- Connect VAG 1598/31 test box to connector on wiring harness. Ground clamp -arrow- must be connected to Ground.

NOTE: Whether or not the engine control module has to be additionally connected to test box is described in the respective test procedures.

- Perform test as described in appropriate repair procedures.

After installing the engine control module, perform the following operations:
- After reconnecting engine control module, perform adaptation of engine control module to throttle valve control module.
- In vehicles with automatic transmission, perform adaptation of kick down switch.
Kick Down Switch Point, Checking