WNW4

Service
Technical Information
255/22 ENU WNW4
2
WNW4 - Re-Coding DME Control Unit (Workshop Campaign)
Important:
CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order.
Model Year:
2022
Vehicle Type:
911 Carrera (992)
Macan (95B)
Cayenne E-Hybrid Coupé (9YB)
Concerns:
DME control unit
Information:
There is a possibility that the DME control unit was not coded according to specifications
during the handover inspection on the affected vehicles.
Action required: Re-code the DME control unit with the latest PIWIS Tester software version.
Minimum requirement: Version 41.550.010
Affected
Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information).
Required tools
Tool:
•
•
9900 - PIWIS Tester 3
Battery charger with a current rating of at least 90 A and a current and voltage-controlled
charge map for lithium starter batteries, e.g. VAS 5908 battery charger 90A
Re-coding DME control unit
Work Procedure: 1
Re-code DME control unit.
The basic procedure for control unit coding is described in the Workshop Manual  Workshop
Manual 'Basic instructions and procedure for control unit programming using the PIWIS Tester'.
For specific information on control unit coding during this campaign, see the table below:
Required PIWIS Tester software version:
41.550.010 (or higher)
AfterSales
Feb 14, 2023
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Service
WNW4
ENU
Technical Information
255/22
Control unit coding using the ‘Automatic coding’
function for the control unit:
Type of control unit coding:
Control unit ‘DME’ – ‘Coding / Programming’
menu – ‘Automatic coding’ function.
Read and follow the information and instructions
on the PIWIS Tester during the guided procedure.
Coding sequence:
Do not interrupt coding.
When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the ‘Status’ box.
Procedure if control unit coding is not
successful:
Repeat control unit coding.
2
Read out and erase the fault memories of all control units.
3
Enter the campaign in the Warranty and Maintenance booklet.
Warranty processing
Information
The specified labor time was determined specifically for carrying out this campaign and includes all
necessary preliminary work and rework.
The labor time may differ from the working times published in the Labor Operation List in the PCSS.
Scope 1:
Re-coding DME control unit
Labor time:
Re-coding DME control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out and deleting fault memories
Labor time: 37 TU
 Damage code WNW4 066 000 1
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2023 Porsche Cars North America, Inc.
Feb 14, 2023
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