Wiring and Components, 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 is advantageous because electronic engine control remains fully functional (e.g. 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.

CAUTION: 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 (ECM).
- 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 the engine control module is to be connected to the test box.
- Perform test as described in relevant repair sequences.

Installing engine control module (ECM)
Installation is performed in reverse order.
- Thereafter, the engine control module must be equipped with the metal retainer.
- Clean threaded holes for shear bolts of locking compound residue. Cleaning can be performed with a thread cutter (tap).
- Always use new shear bolts.
- Check DTC memory and, if necessary, erase it. After DTC memory is erased, a readiness code must be generated for the engine control module using "Guided Functions" operating mode.

NOTE: When ending Guided Fault Finding, the tester attempts to erase the 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.