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

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

Special tools, testers and auxiliary items required

• Adapter Cable (V.A.G 1598/39-1)

• Adapter Cable (V.A.G 1598/39-2)

• Test Box 105 Pin (V.A.G 1598/42)

• The test box has 105 terminals. The connection cable can be separated from the test box. This means that as new engine control module (ECM) connectors are introduced in the future, only a new cable must be designed and no longer the entire test box.

• The smaller of the two connectors on the ECM is assigned with terminals 1 to 60. The larger of the two connectors is assigned with terminals 1 to 94.

• If a wiring connection to the ECM is to be tested, use the wiring diagrams to determine through which connector the electrical wiring connection leads to the ECM. Lead the electrical wiring connector to the 60-pin connected, then connect the smaller of the two connectors (V.A.G 1598/39-1) to the input "A" on the (V.A.G 1598/42).

• For testing at the 60-pin harness connection, 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 harness connection, 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 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.

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

To avoid damaging electronic components, switch to the corresponding measuring range and observe all test conditions before connecting the test leads.

- Remove engine control module (J623). Refer to => [ Engine Control Module (J623) ] Service and Repair.

- 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 test as described in relevant repair sequences.

Installing the ECM

Install in reverse order of removal.

- The ECM must be equipped with the metal retainer again.

- New shear bolts must always be used.

- Clean the threaded holes of residue and locking compound for the new shear bolts. Cleaning can be performed with a thread cutter (tap).

Perform the following step after installing a new engine control module:

- Activate the engine control module in "guided functions" under "replace engine control module". Use a vehicle diagnosis tester for this.