With Generic Scan Tool

Fuel Pump (FP) Relay J17 , checking

Special tools, testers and auxiliary items required
- Multimeter
- Wiring diagram

Test requirements
- The Engine Control Module (ECM) J220 fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, selector lever in position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.

Test procedure

- Perform a preliminary check to verify the customers complaint.

- Using a Multimeter, check the following wiring connection for voltage.






Specified value: 12.5 V

If the specified value was not obtained:

- Check the Fuel Pump (FP) Relay J17 socket 17/30 to the Battery A (+) terminal for an open circuit or short to Ground (GND).

- Check the electrical harness connectors for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

Checking voltage

- Switch the ignition on.

- Using a Multimeter, check the following wiring connection for voltage.






Specified value: 12.5 battery voltage

- Switch the ignition off.

If the specified value was not obtained:

- Check the Fuel Pump (FP) Relay J17 socket 19/15 to the Ignition/Starter Switch D terminal 15 for an open circuit or short to Ground (GND).

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

Checking Ground (GND)

- Using a Multimeter, check the Fuel Pump (FP) Relay J17 socket 16/s to the Engine Control Module (ECM) J220 electrical harness connector T80 terminal 4 for resistance.

Specified value: 1.5 Ohms

If the specified value was not obtained:

- Check the Fuel Pump (FP) Relay J17 socket 16/s to the Engine Control Module (ECM) J220 electrical harness connector T80 terminal 4 for an open circuit or a short to Battery (+) or to Ground (GND).

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK:

- Replace the Fuel Pump (FP) Relay J17.

- Perform a road test to verify repair.

If the fault does not return:

Repair complete, Generate readiness code. Audi Drive Cycle/Readiness Code

- End diagnosis.

If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK:

- Replace the Engine Control Module (ECM) J220.

- Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

End of diagnosis.