Calibrating Fuel Level Sender

Information 

• The setpoint values from the fuel level sender are backed up online. The PIWIS Tester must have an online connection in order to calibrate the fuel level sender. 
• Calibration of the fuel level sender is required after replacing the fuel tank or the fuel level sender. 
• After replacing the instrument cluster, the Restore tank sensor calibration values procedure can be carried out. The tank sensor calibration values are retrieved online and stored in the instrument cluster. 
• If no tank sensor calibration values are stored online for the vehicle, the fuel level sender must be calibrated after replacing the instrument cluster. 
• The fuel level sender does not have to be calibrated if the battery is disconnected or if a plug connection on the instrument cluster or fuel level sender is disconnected. The values remain stored in the instrument cluster. 
• A range on remaining fuel of less than 15 km is not displayed in the instrument cluster. 

Information 

After draining or filling the fuel tank, the fuel level sender needs about one minute to react to this. If the new fuel level is not displayed after this time, the calculation of the fuel level can be triggered by releasing, disconnecting, connecting and locking the electric plug connection on the fuel level sender.

1. Check whether an empty fuel level is displayed in the instrument cluster.
2. Only if no empty fuel level is displayed in the instrument cluster: 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Cover in floorpan

   1. 2.1  Remove rear seat at the rear right.

      > 724819 REMOVING AND INSTALLING REAR SEAT

      Information 

      The fuel pump cap can be damaged during removal. Replace it if necessary.

   2. 2.2  Remove fuel pump cap -1- 

      > 207019 REMOVING AND INSTALLING CONTROL UNIT FOR FUEL PUMP

3. Only if no empty fuel level is displayed in the instrument cluster: 

   Release and disconnect electric connections -3-  on the fuel pump unit -1-  and then reconnect them. The fault memory must then be read out and erased if necessary.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Fuel pump unit connections

4. Check whether an empty fuel level is displayed in the instrument cluster.
5. Calibrate fuel level sender.
   1. 5.1  Connect the PIWIS Tester  to the vehicle and start it.
   2. 5.2  Switch on the ignition.
   3. 5.3  Select the required vehicle type.
   4. 5.4  Select Instrument cluster  control unit.
   5. 5.5  Select whether or not you want to create a vehicle analysis log (VAL).
   6. 5.6  Select Maintenance/repairs  menu.
   7. 5.7  Select Fuel tank calibration  menu.
   8. 5.8  The preconditions specified on the Tester must be met.
   9. 5.9  In the Select fuel-level sensor  menu, select whether you only want to calibrate fuel-level sensor 2 or both fuel-level sensors.
   10. 5.10  Select Fuel tank calibration  menu and perform calibration in accordance with instructions on the Tester.
   11. 5.11  The message Fuel tank calibration completed successfully  appears on the PIWIS Tester  screen.
   12. 5.12 PIWIS Tester  must now be disconnected from the vehicle.
6. Fill in fuel.

   > 200317 DRAINING AND FILLING FUEL

   Information 

   After draining or filling the fuel tank, the fuel level sender needs about one minute to react to this. If the new fuel level is not displayed after this time, the calculation of the fuel level can be triggered by releasing, disconnecting, connecting and locking the electric plug connection on the fuel level sender.

7. Check whether a full fuel level is displayed in the instrument cluster.
8. Only if no full fuel level is displayed in the instrument cluster: 

   Release and disconnect electric connections -3-  on the fuel pump unit -1-  and then reconnect them.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Fuel pump unit connections

9. Check again whether a full fuel level is displayed in the instrument cluster.
10. Only if no full fuel level is displayed in the instrument cluster: 

    Change terminals.

    1. 10.1  Switch off the ignition.
    2. 10.2  Wait 30 seconds.
    3. 10.3  Switch on the ignition.
11. Check again whether a full fuel level is displayed in the instrument cluster.
12. Complete the rear of the vehicle again.

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Cover in floorpan

    Information 

    The fuel pump cap can be damaged during removal. Replace it if necessary.

    1. 12.1  Install cover -1-  in the floorpan.
    2. 12.2  Install rear seat at the rear right.

       > 724819 REMOVING AND INSTALLING REAR SEAT