S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Fuel Level Signal: Testing and Inspection
Fuel Tank Level Signal, Checking
NOTE:
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The Engine Control Module (ECM) receives the fuel tank level signal from the instrument cluster.
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The processed signal enters on terminal 30 the Engine Control Module (ECM) and is used to determine certain malfunctions (e.g.: misfire)
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Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself.
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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).