Scan Tool Connecting

Wiring and Components, Checking with Test Box VAG 1598/42

Special tools, testers and auxiliary items required

• Adapter Cable (V.A.G 1598/39)

• Test Box (V.A.G 1598/42)

• The (V.A.G 1598/42) is designed with 105 terminals. It can be connected to the engine control module (ECM) via 2 different adapter cables.





• The ECM is connected to the vehicle electrical harness via a 60-pin connector and a 94-pin connector.

• For testing at the 60-pin connector, the (V.A.G 1598/39-1) is connected to the test box with connector "A". Components of the 60-pin harness connection.

• For testing at the 94-pin connector, the (V.A.G 1598/39-2) is connected to the test box with connectors "A" and " B". Components of the 94-pin harness connection.

• The (V.A.G 1598/42) is designed so that it can be connected simultaneously to the ECM harness and the engine control module itself. This is advantageous because electronic engine control remains fully functional (for example measurement of signals with engine running) when the test box is attached.

• The procedure will indicate whether the engine control module is to remain connected to the test box or not.

• To connect measuring instruments (for example (V.A.G 1527B ), (V.A.G 1526C) etc.) always use (V.A.G 1594C).

The ECM must be removed to disconnect the ECM harness connectors. Refer to => [ Engine Control Module ] Engine Control Module.

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

- Connect (V.A.G 1598/42) to wiring harness with (V.A.G 1598/39-1) or (V.A.G 1598/39-2). Clamp test box Ground (GND) clip to battery negative terminal. The procedure will indicate whether the engine control module is to be connected to the test box or not.





- Perform the test as described in the corresponding repair procedure.

- After completing the test, install the ECM => [ Engine Control Module ] Engine Control Module.

After installing ECM, the following work steps must be performed:

- Check the DTC memory and, if necessary, erase it. After DTC memory is erased, a readiness code must be generated for the ECM using operating mode Guided Fault-Finding.