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Home >> Porsche >> 2016 >> Cayman GTS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (27 - Starter, Power Supply, Cruise Control -- 92A Cayenne) >> WM 279455 Replacing Control Unit For HV Battery (Cayenne S Hybrid) >> Reading And Writing Values

Reading And Writing Values

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
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 Porsche System Tester to the vehicle and start the System Tester. Switch on ignition.
  2. Select the vehicle type and start the PIDT.
  3. Select the High-voltage battery  control unit in the overview  .
  4. Select Maintenance/repairs  .
  5. Select Control unit replacement  and press [F12].
  6. Select Read data  and press [F12].
  7. Press [F8] to start reading out data.
  8. Check the chassis number and press [F12].
  9. Switch off ignition and replace control unit. → 279419 REMOVING AND INSTALLING BATTERY MANAGEMENT SYSTEM CONTROL UNIT .
  10. Switch on ignition. Select the Write data  menu (procedure described above), press [F12] and then press [F8] to start installing the data that was read out.
  11. The System Tester displays the message Data has been written  . Press [F12] to continue.
  12. Read out the fault memory and erase it if necessary.
  13. Select the Calibrate phase angle  function and follow the instructions on the Tester.
  14. Function test: Perform a test drive.
  15. Read out fault memory.
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