Electrical Testing, With Test Box VAG 1598/31

Electrical Testing, with Test Box VAG 1598/31

• If the Engine Control Module (ECM) is equipped with a metal antitheft housing (for theft prevention), the metal anti-theft housing must be removed from the ECM to connect the test box. Refer to => [ Engine Control Module with Metal Anti-Theft Housing, Replacing ] Engine Control Module With Metal Anti-Theft Housing, Replacing. After repairs are complete, the metal anti-theft housing must be reinstalled.

• The test box (VAG1598/31) 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 engine control system remains fully functional when the test box is connected (for example, for measuring signals when the engine is running).

• Relevant test procedures note if ECM should also be connected to the test box or not.

• Always use (VAG1594A) connector test kit to attach measurement devices (e.g. voltage tester (VAG1527B), Multimeter (VAG1526) etc.).

Work sequence

- Switch ignition off.

- Remove ECM => [ Removing ] Engine Control Module With Metal Anti-Theft Housing, Replacing.

- Connect test box (VAG1598/31) to connector of wiring harness. Ground (GND) clip at test box must be clipped to battery Ground. Connect test box (VAG1598/31) to connectors of wiring harness.





- Relevant test procedures note if ECM should also be connected to test box.

- Perform test as described in appropriate repair procedures.

• Important notes after re-connecting ECM:

- Check DTC memory and erase, if necessary. Refer to => [ DTC Memory, Erasing ] DTC Memory, Erasing.

- Generate readiness code. Refer to => [ Readiness Code, Generating ] Readiness Code, Generating.