Replacing Transfer Box With Servo Motor (With Integrated Control Unit)

Information 

Transfer gear with gas nitrocarburised (GNC) "hardened" steel plates.

• Check compatibility of hardware (transfer gear) and software. 
• If a transfer gear with GNC plates is installed for the first time, the PR number LU2 must be written under Maintenance of vehicle data in the PIWIS Tester. 

Information 

• If the transfer gear with servo motor (control unit) is replaced, there is no need to reload data (classification data).
• This data is already contained in the control unit for servo motor and transmission bundle replacement.
• If only the servo motor (control unit) is replaced, the data (wear values, classification data, etc.) must be read out of the old control unit and written into the new one using the PIWIS Tester.
• If the data can no longer be read out, the classification data on the transfer gear housing must be read off and written using the PIWIS Tester: - > All-wheel\Maintenance/repairs\Control unit replacement 
• Classification data can be found on the transfer gear housing.

Only valid for model year 2011 - 2012: 

> 391300 All-wheel drive control unit needs to be replaced: Missing offset and gradient values on the transfer gear (66/11)

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Example: classification data for transfer gear

If the transfer box (including servo motor) is replaced, the following steps must still be carried out: 

1. Convert support -1-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Transmission bracket to transfer box

   1. 1.1  Tightening torque for screw -2-  : > Tightening torque 23 Nm (17 ftlb.)  -- Dang --
   2. 1.2  Tightening torque for screw -3-  : > Tightening torque 23 Nm (17 ftlb.)  -- Dang --
2. Connect the PIWIS Tester to the vehicle and start it. Switch on ignition. Press I F12 to continue.

   Value group	Family	Value
   PR numbers	Transfer box differentiation	LU2 - Transfer box reinforced

3. Select the required all-wheel drive  control unit in the overview. 
4. Select the Control unit and transmission replacement (combined)  procedure in the Maintenance/repairs  menu.

   The PR number LU2 is checked automatically and written if necessary during the procedure

5. Reading out and erasing fault memories.

   Check whether LU2 was written correctly under: F7 menu\Maintenance of vehicle data 

6. Perform a test drive.