Fuel pump, checking
Special tools, testers and auxiliary items required
- Hand held remote control (jumper).
- Multimeter.
- Electrical connector test lead set.
Test requirements
- Battery voltage at least 11.5 volts.
- Fuel Pump (FP) Fuse 28 OK.
- Fuel Pump (FP) Relay J17 OK.
Checking voltage supply
- Remove the rear seat bench. Refer to 72 - SEAT - FRAMES .
- Disconnect the Transfer Fuel Pump (FP) G6 electrical harness connector.
Fig 1: Connecting Voltage Tester V.A.G 1527B Using Adapter Cables From Connector Test Kit V.A.G 1594C To Outer Terminals Of Connector
- Using a Multimeter , check the Transfer Fuel Pump (FP) G6 electrical harness connector terminals 1 to 4 for voltage.
Specified value: battery (+).
If the specified value was not obtained:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the electrical circuit.
If the specified value was obtained:
- Connect a Hand held remote control (jumper) to terminal - 1 - of the fuel pump electrical harness connector and to the vehicle battery (+).
Fig 2: A Jumper Cable From A Electrical Connector Test Lead Set Connected To Terminal Of The Fuel Delivery Unit And To Vehicle Ground
- Connect a jumper cable from a Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
- Press switch on the Hand held remote control (jumper).
NOTE:
- The Fuel Pump (FP) runs quietly. Avoid surrounding noises while testing the fuel pump.
- Listen for an operating noise from the fuel pump.
If no operating noise is heard:
- Remove the fuel delivery unit. Refer to 20 - FUEL SUPPLY .
Fig 3: Checking The Electrical Circuit Between Terminals Of The Fuel Delivery Unit And The Fuel Pump For Continuity
- Using a Multimeter , check the electrical circuit between terminals - 1 - and - 4 - of the fuel delivery unit and the fuel pump for continuity.
Specified value: 0 ohms.
If a malfunction is detected in the electrical circuit:
- Check the wiring for a short circuit to Battery positive (+) or an open circuit.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the electrical circuit.
- If no malfunction is detected in electrical circuit, replace the fuel pump. Refer to 20 - FUEL SUPPLY .
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory.
- If necessary, erase the DTC memory.
- If the DTC memory was erased, generate readiness code.
End diagnosis