Fuel Tank Level Signal, Checking

NOTE:
- The Engine Control Module (ECM) receives the fuel tank level signal from the instrument cluster.
- The processed signal enters on terminal 30 the Engine Control Module (ECM) and is used to determine certain malfunctions (e.g.: misfire)


- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself.
- Check wiring from test box socket 30 to instrument cluster according to wiring diagram for an open circuit and short circuit to B+/Ground (GND).