Wiring and Component Testing Using VAG1598/31 Test Box

Wiring And Component Testing Using VAG1598/31 Test Box


NOTE:
- 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 whether 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.).


WARNING!
To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.


Special tools and equipment

VAG1598/31:

Procedure







- Switch ignition off.
- Remove Engine Control Module (ECM).
- Connect VAG1598/31 test box to connector of wiring harness. Ground (GND) clip at test box (not visible in illustration) must be connected to Ground (GND). Relevant test procedures note whether Engine Control Module (ECM) should also be connected to the test box.
- Perform test as described in relevant repair sequence.

NOTE:
Important note:
After re-connecting the Engine Control Module (ECM), the following work steps must be performed:
- Perform adaptation of the Throttle Valve Control Module -J338-.
- For vehicles with automatic transmission, the kick down function must be adapted.
- Check DTC memory and erase it if necessary.
- If DTC memory was erased, readiness code must be re-generated. Readiness Code, Generating

During the first adaptation phase, it is possible that idle will be rough and vehicle may shake lightly in drive mode.