Checking With Test Box V.A.G 1598/42

Wiring And Components, Checking With Test Box V.A.G 1598/42

NOTE:
- The test box is designed with 105-pins. 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 engine control module (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 engine control module (ECM) is to be tested, use the wiring diagrams to determine through which connector the wire leads to the engine control module (ECM). If it is a wire that leads to the 60-pin connector, e.g. the wire for activating the variable intake manifold valve, (T60/27) then connect the smaller of the two connectors adapter cable V.A.G 1598/391 to the input "A" of the test box V.A.G 1598/42 and measure to Pin 27.







- If a wiring connection leads to the 94-pin connector according to wiring diagram, connect the larger of the two connectors adapter cable V.A.G 1598/392 as follows. The connector designated with an "A" must be connected to input "A" of the test box V.A.G 1598/42 and the connector "B" must be connected to input "B" of the test box V.A.G 1598/42.
- The test box V.A.G 1598/42 is designed so that it can be connected simultaneously to the engine control module harness and the engine control module itself.
- This makes it possible for the electronic engine control to remain fully functional with the test box attached (e.g. measurement of signals with engine running).
- The procedures will indicate whether the engine control module is to remain connected to the test box or not.

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

- Remove Engine Control Module (ECM) Engine Control Module (ECM) J623, replacing
- Connect test box V.A.G 1598/42 to wiring harness connector. Ground (GND) clip at test box must be clipped to battery minus. The procedures will indicate whether engine control module is to be connected to test box.
- Perform test as described in relevant repair sequences.

Installing engine control module (ECM)
Installation is in reverse order of removal, ECM must be installed with protective housing. New shear bolts must be used.

Perform the following work after engine control module (ECM) is reconnected:
- Check DTC memory and erase it, if necessary. VAS 5051 Vehicle diagnostic, testing and information system.