Wiring and Component Testing Using VAG1598/31 Test Box

Electrical Testing Using VAG1598/31 Test Box

NOTE:
- If the Engine Control Module (ECM) is equipped with a metal anti-theft housing (for theft prevention), the metal anti-theft housing must be removed from the ECM to connect the test box. After repairs are complete, the metal anti-theft housing must be reinstalled.
- VAG1598/31 test box is designed so that it can be simultaneously connected to the wiring harness at the Engine Control Module (ECM) and also to the ECM itself.
- This is advantageous because electronic engine control remains fully functional (e.g. measurement of signals with engine running) when the test box is attached.
- Relevant test procedures note if Engine Control Module (ECM) should also be connected to the test box or not.
- Always use VAG1594A connector test kit to attach measurement devices (e.g. VAG1527B voltage tester, VAG1526 multimeter etc.).

CAUTION: To reduce the risk of damage to electronic components, switch on power to components before connecting test leads and observe test requirements.

Special tools and equipment







- VAG1598/31


Procedure
- Switch ignition off.
- Remove windshield wiper arms (unscrew).
- Disconnect cover for plenum chamber and place it on windshield side.
- Disengage locking lugs and remove control module connector.







- Connect VAG1598/31 test box to connector of wiring harness. Ground (GND) clip (arrow) at test box must be clipped to battery Ground. Relevant test procedures note if Engine Control Module (ECM) should also be connected to the test box.
- Perform test as described in relevant repair sequence.

NOTE: Important notes after re-connecting Engine Control Module (ECM):

- Check DTC memory and erase it if necessary.
- Generate readiness code. Readiness Code, Generating

NOTE: In the first adaptation phase during engine basic setting, it is possible that idle will be rough and vehicle may shake lightly in drive mode.