Transfer Fuel Pump (FP) -G23-, Checking

Transfer Fuel Pump (FP) -G23-, Checking

Special tools, testers and auxiliary items
- V.A.G 1526 A
- V.A.G 1594 A

Test conditions:
- Battery voltage at least 12.7 V
- Fuel Pump (FP) Control Module -J538-; checking. Testing and Inspection







- Safety device S81 OK (card location C) in the relay support driver's side behind the driver's side shelf.







- Fuel pump relay on card location 4 in the central electrical connection behind the driver's side shelf
- Fuel filter OK
- Switch ignition off

Test sequence:
- Briefly operate starter
- Vibration of the pump right on fuel tank must be felt.

If no vibration is felt:







- Remove screw -3- and pull fuel pump downward. Fuel hoses -2- and - 4- as well as connector -1- remain attached.







- Connect the multimeter for voltage measurement to contacts -1- and - 2- as shown, using probes and adapters from VAG 1594 A; the connection remains disconnected
- Briefly operate starter
- Desired value: Briefly (approx. 1 second) approx. battery voltage, then it drops to 10 V

Desired value is reached, although no vibration at the pump is felt:
- Replace defective fuel pump.

Desired value is not reached:
- Check circuit between Fuel Pump (FP) Control Module -J538- and Transfer Fuel Pump (FP) -G23- using circuit diagram

No wiring problem found:
- Checking Fuel Pump (FP) Control Module -J538-. Testing and Inspection