Connecting VAG 1598/31 Test Box

Wire and component test using VAG1598/31 test box

NOTE:
- VAG 1598/31 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.).

CAUTION!
To reduce the risk of damaging electronic components, set the tester to the appropriate test range and observe test requirements before connecting test leads.

Special Tools and Equipment

- VAG1598/31

Procedure
- Switch ignition off.

- Pull off rubber seal of plenum chamber cover in direction of arrow.
- Remove cover -1- toward front.

- Remove Heater Core E-box cover -arrows-.

- Using a screwdriver, carefully pry off retaining bracket (arrow).
- Disengage locking lugs and remove control module connector.

NOTE: Adaptation values are erased when connector is disconnected from the Engine Control Module (ECM), DTC memory content remains intact.

- 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.

Important note:
After re-connecting the Engine Control Module (ECM), the following work steps must be performed:
- Check DTC memory and erase it if necessary.
- Perform adaptation of the Throttle Valve Control Module -J338-.

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.