Wiring and components, checking with test box V.A.G 1598/31: Notes

WARNING: This page is about a different variant/trim than selected.

Refer to wiring diagrams. Electrical Wiring Diagrams, Troubleshooting and Component Locations

If it is not specifically mentioned in a particular component check whether the test box should be connected to the Engine Control Module (ECM) 1 wiring harness or Engine Control Module (ECM) 2 wiring harness, refer to the wiring diagram.

For example, if checking wiring from Knock Sensor (KS) 1 -G61- "to engine control module" (this example does not specify if wires to engine control module 1 or 2 should be checked), then refer to electrical wiring diagram to see that Knock Sensor (KS) 1 -G61- is connected to ECM 1.

Logically, this indicates that the test box should be connected to the engine harness that leads to ECM 1.

Fig 1: V.A.G 1598/31 Test Box

Courtesy of VOLKSWAGEN UNITED STATES, INC.

NOTE:

The test box V.A.G 1598/31 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.
For testing, use multimeter V.A.G 1526 or multimeter V.A.G 1715 or an equivalent as well as the diode test lamp V.A.G 1527B.
To connect testing devices to the test box V.A.G 1598/31, always use adapters from connector test set V.A.G 1594.

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