Fuel Consumption Signal, Checking

- Connect adapter cable VAG 1598/13 to ten-point instrument cluster connector (black).
- Connect adapter harness to VAG 1598 test box.
- Set multimeter (Fluke 83 or equivalent) to 2 volt range.
- Connect multimeter between sockets 5 and 1 of VAG 1598 test box.
- Start engine.
- Raise and lower engine speed (RPM) between 1000 and 4000.
- Must be approximately 0.3 - 1.0 volt depending on engine speed