Reading And Writing Values
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 90 A to the vehicle battery.
Information
The PIWIS Tester 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 on the PIWIS Tester.
- Connect the Porsche System Tester to the vehicle and start the System Tester.
- Switch on ignition and press F12 to continue.
- Select the vehicle type and start the PIDT.
- Select Adaptive cruise control control unit in the overview.
- Maintenance/repairs must then be selected.
- Control unit replacement must now be selected. Then press F12 to continue.
- Read data must be selected. Then press F12 to continue.
- Press F8 to start reading out data.
- Check the chassis number and press F12 to continue.
- Switch off ignition and replace control unit.
> 278519 REMOVING AND INSTALLING CONTROL UNIT FOR DISTANCE MEASURING SENSOR
- Switch on ignition. Select the Write data menu (procedure described above), press F12 to continue and then press F8 to start installing the data that was read out.
- The System Tester displays the message Data has been written. Press F12 to continue.
- Read out the fault memory and erase it if necessary.