Wiring and Components, Checking With Test Box 105 Pin (V.A.G 1598/42)

Wiring and Components, Checking with Test Box 105 Pin (V.A.G 1598/42)

Special tools, testers and auxiliary items required

• Adapter Lead (V.A.G 1598/39)

• Test Box 105 Pin (V.A.G 1598/42)

• Vehicle Diagnostic Tester

• Voltage Tester (V.A.G 1527B)

• Multimeter (V.A.G 1526E)

• Connector Test Set (V.A.G 1594C)

• 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 harness connection, the adapter lead (V.A.G 1598/39-1) is connected to the test box with connector - A -.






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

• The (V.A.G 1598/42) is designed so that it can be connected simultaneously to the ECM harness and the ECM 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.

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

It is necessary to remove the ECM first in order to disconnect the connectors from it. Refer to => [ Engine Control Module (J623) ] Engine Control Module (J623).

Danger of causing damage to electronic components.

• Before connecting test leads, switch on respective measuring range and observe test conditions.

- Remove the ECM. Refer to => [ Engine Control Module (J623) ] Engine Control Module (J623).

- Connect the (V.A.G 1598/42) to the wiring harness connector. Attach the ground clip on the test box to the battery negative cable. The procedures will indicate whether the ECM is to be connected to the test box.

- Perform test as described in relevant repair sequences.

Installing the ECM

Install in reverse order of removal.

The procedures to follow after connecting the new ECM are described in Guided Fault Finding and Guided Functions.

• When ending Guided Fault Finding, the tester attempts to erase the Diagnostic Trouble Code (DTC) memory of all control modules. If this is not successful, the remaining DTCs stored in memory must be corrected until all DTCs can be erased.