S6 V8-4.2L (BBD) (2004)
NOTE: Electrical circuits -1- to the fuel pump can not be disconnected from the control module -2- for the fuel pump. This is why the voltage supply is
measured directly at the fuel pump.
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Remove rear seat
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Remove cover located under rear seat
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Briefly operate starter
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Operating noise of the Fuel Pump (FP) -G6- must be audible at the locking flange (right)
NOTE: Fuel pump runs very quietly. During the checking of the fuel pump, excess noise should be avoided.
If no operating noise is audible:
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Connect the multimeter for voltage measurement to contacts 1 and 4 as shown, using probes and adapters from VAG 1594 A; the connection
remains disconnected.
NOTE: Pin numbers are located on the back of connector
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Briefly operate the starter
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Desired value: Briefly (approx. 1 second) approx. battery voltage, then it drops to 10 V
Desired value not reached:
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Check the circuit connection between fuel pump control module -J538- and fuel pump -G6- for open circuits according to the schematics.
No problem found:
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Replace Fuel Pump (FP) Control Module -J538-.
Voltage Supply For Fuel Pump -G23 (from Fuel Pump Control Module -J538), Checking