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Home >> Porsche >> 2013 >> Cayenne Base, Automatic Trans >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> 39 - Final Drive - Differential, Differential Lock -- 92A Cayenne >> WM 397855 Replacing Transfer Gear Control Unit (All Models) >> Coding Transfer Gear Control Unit
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Coding Transfer Gear Control Unit

NOTE: Voltage drop
  • Risk of irreparable damage to control unit
  • Risk of damage to control unit
  • Fault entries in the control unit
  • Coding in the control unit is aborted
  • Malfunctions in control unit, even during programming

→ Prior to disconnecting the control unit, switch off ignition and remove ignition key.

→ Ensure that the power supply is not interrupted during programming.

→ Connect a battery charger with a current rating of at least → Nominal value: 40 A  to the vehicle battery.

Information 

The PIWIS Tester II 9818  instructions take precedence since the description may be different with later Tester releases.

The procedure described here has been structured in general terms. Different text or additional information may appear in PIWIS Tester II 9818  .

  1. Connect the PIWIS Tester to the vehicle and start the Tester. Switch on ignition.
  2. Select the vehicle type and start the diagnostic application.
  3. Select the All-wheel  control unit in the overview  .
  4. Extended identification  must now be selected.
  5. Enter the vehicle identification number  and press [Enter] to confirm your entry.
  6. Select Programming  and press to continue.
  7. Automatic programming  must now be selected. Then press [F12] to continue.
  8. Follow the instructions on the Tester and press [F12] to continue.
  9. Maintenance/repairs  must then be selected.
  10. Control unit replacement  must now be selected. Then press [F12] to continue.

    Information 

    Only select the function if just the control unit will be replaced. If the control unit and transfer gear will be replaced, "Control unit and transmission replacement (together)" must be selected.

  11. Write data to new control unit/Start-up  must then be selected. Then press [F12] to continue.
  12. Enter the chassis number and press [F12] to continue.
  13. Follow the instructions on the Tester and press [F12] to continue.
  14. Select Write data  and press [F8] to start. The data is now loaded.
  15. The Tester displays the message Data was written successfully to the control unit  . Press [F12] to continue.
  16. Switch off ignition and press [F12]
  17. Start the engine and press [F12] to continue.
  18. Check operation of transmission.
  19. Read out the fault memory and erase it if necessary.
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