Function and Voltage Supply
Fuel Pump, Checking
Special tools, testers and auxiliary items required
• Wrench (T10202)
• Fuel injection pressure gauge (VAG 1318)
• Pressure gauge adapter (VAG 1318/1)
• Adapter (VAG 1318/11)
• Hose adapter (VAG 1318/16)
• Adapter set (VAG 1318/17A)
• Fuel line feed adapter (VAG 1318/23)
• Torque wrench (40-200 Nm) (VAG 1332)
• Remote control (VAG 1348/3A)
• Connector test set (VAG 1594C)
• Multi-meter (VAG 1715)
• Test instrument adapter/DSO (5-pin) (VAS 5565)
• Voltage tester (VAG 1527B)
Function and Voltage Supply
• Fuel pump relay is OK.
• Battery voltage at least 11.5 volts.
• Fuse for fuel pump is OK. Fuse assignment.
• Fuel pump function is checked via the output Diagnostic Test Mode (DTM).
- Connect the (VAS 5051B) as follows:
- Connect the diagnostic cable - 2 - connector to the Data Link Connector (DLC) in the driver's footwell.
- Switch on the ignition.
- Press the buttons for "Vehicle Self-Diagnosis", " 01 - Engine electronics" and "Output Diagnostic Test Mode (DTM) " on display in succession.
- Press the right arrow button on the display to initiate the fuel pump activation.
Fuel pump must run.
- Switch off the ignition.
If the Fuel Pump is Not Activated
- Remove the rear seat bench.
- Remove the cover - arrows - from the fuel delivery unit.
- Disconnect the 5 pin electrical connector from the fuel delivery unit.
- Connect the (VAG 1527B) using adapter cables from the (VAG 1594C) to the outer terminals of the electrical connector.
- Initiate the output DTM again.
• Light Emitting Diode (LED) must now light up.
LED does not light up:
- Locate and repair the open circuit in the wiring using the wiring diagram.
LED lights up (voltage supply OK):
- Remove the locking ring using the (T10202).
- Check if the electrical wiring between the fuel delivery unit and fuel pump is connected.
If no open circuits are found:
- Fuel pump is faulty, replace the fuel delivery unit. Refer to => [ Fuel Delivery Unit ] Fuel Delivery Unit.