No. 160-23-1 Service Bulletin/Repair Instructions

Service
Technical Information
160/23 ENU WPN9
9
WPN9 - Re-Programming Central Computer (PCM) Control Unit (Workshop/OTA

Campaign)

Model Line:
Taycan (Y1A/Y1B/Y1C)
Model Year:
As of 2020 up to 2024
Concerns:
Control unit for central computer (PCM)
Cause:
Optimized software is available for the central computer (PCM) control unit.

An overview of optimizations that will be implemented with the software update can be found in the

enclosure under  Technical Information 'Overview of optimisations of the software update'
Actions:
•

•
Re-program the central computer (PCM) control unit using the latest PIWIS Tester software release

in each case.

Minimum requirement: Release 42.250.050
Checklist:
For better clarity, a checklist was created as an aid for carrying out the campaign.

This does not replace TI.

The checklist does not have to be attached to the job line in PCSS.

For checklist, see  Technical Information 'Checklist'
Affected

Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

Information

Scope definition

Scope 1: Over-the-Air (OTA) software update via PCM.

•
Please note that as a rule the OTA software updates should be installed by the driver (main user)

via the Porsche Communication Management (PCM), provided that the software package for the

campaign has been downloaded to the vehicle via OTA (Scope 1) and the update is then displayed in

the PCM ‘Updates’ menu.
Scope 2: Re-programming central computer (PCM) control unit via PIWIS Tester.

•
For vehicles on which the preconditions for performing an OTA software update are not met at the

time of publication of the campaign (online software update in MyPorsche deactivated/Privacy

Mode), no OTA update is displayed in the vehicle (PCM). These vehicles are therefore assigned to

Scope 2 of this campaign and must be updated with the current PIWIS Tester test software for the

corresponding control unit.
AfterSales
Nov 3, 2023

Page 1 of 8
9
Service
Technical Information
ENU 160/23
WPN9
Required tools

Tools:
•

•

•
P90999 - P90999 - PIWIS Tester 4

Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90 A

USB storage medium Type A+C 32 GB (for PCM update), Part No. V04014999WW000
Re-programming central computer (PCM) control unit - scope 2

Work

Procedure:
Information

Before starting programming, particular attention must be paid to the following:

•
Switch off the charger off and on once; the battery charger display must be off before starting it

again, because the battery charger automatically switches to trickle charge after 5 hours (default

setting in the charger).
•
Set charge voltage to 14.8 volts.
•
Operate in charging mode.
•
Vehicles with a PVTS contract must be activated for Service mode.
•
The PIWIS Tester must not be charged using the cigarette lighter!
1
The basic procedure for control unit programming is described in the Workshop Manual 

Workshop Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS

Tester'.
2
Select Guest account from the central display (PCM) and activate Privacy mode (available in some

countries).

Information

If Privacy mode is not active, programming may be aborted, resulting in a defect in the central

computer (PCM). Central computers that are replaced as part of the workshop campaign are

checked by Porsche AG. If private mode was not set in the central computer before starting

programming, the costs will be re-debited.
3
Re-program main computer (PCM).

Prepare USB stick with the required PIUS software 9Y2909000R.

For specific information on control unit programming during this campaign, see the table below.
Nov 3, 2023

Page 2 of 8
AfterSales
Service
Technical Information
160/23 ENU WPN9
9
Required PIWIS Tester software release:
42.250.050 (or higher)
Type of control unit programming:
In the control unit selection (‘Overview’ menu)

select the PCM central computer control unit

and select the ‘Service/repairs’ menu.

Select the ‘Install software update’ function

and press •F12“ (‘Next’) to perform the

software update.
Programming code:
J1K2T
Programming sequence:
Read and follow the information and

instructions on the PIWIS Tester during the

guided programming sequence.

Do not interrupt programming and coding.

A backup documentation process for the

re-programmed software releases starts once

programming and coding is complete.
Programming time (up to):
25 minutes
Software release to be programmed during

this campaign:
•
Control unit programmed in this campaign:
•
Procedure in the event of error messages

appearing during the programming sequence:
 Workshop Manual '9X00IN Basic instructions
AfterSales
3882
Following control unit programming, the

software release can be read out from the

relevant control unit in the ‘Incremented identifications’ menu using the PIWIS Tester.

Control unit for central computer (PCM)
and procedure for control unit programming

using the PIWIS Tester - section on “Fault finding”'
Nov 3, 2023

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Service
Technical Information
ENU 160/23
WPN9
Procedure in the event of a termination in the

control unit programming:
Repeat control unit programming by restarting

programming.

Additional instructions for aborted programming

 Technical Information '9X00IN Additional

instructions if programming is aborted'
Integration test procedure:
•

•
4
The integration test shows a green result

independently of the necessary campaign

The WPN9 campaign must still be

carried out
Read out all fault memories, process and delete existing faults if necessary.

Information

If control units are found to have faults that are not caused by control unit programming, these

must first be found and corrected. This work cannot be invoiced under the workshop campaign

number.
5
Press •F3“ to start the integration test in the control unit selection.

All affected control units should now be successfully re-programmed or checked in the control unit

overview and their status.

Information

If a deviation in the integration test is still indicated despite programming being carried out, this must

be repeated. If the deviation persists, contact Technical Support.
6
Set battery charger back to a charge voltage of 14.4 volts.
7
Enter the campaign in the Warranty and Maintenance logbook.
Warranty processing

Scope 1:
Over-the-Air (OTA) software update via PCM.

•
Nov 3, 2023

Page 4 of 8
No invoicing possible.
AfterSales
Service
Technical Information

Scope 2:
160/23 ENU WPN9
9
Re-programming central computer (PCM) control unit via PIWIS Tester.

•
Vehicles without OTA activation.

Labor time:

Re-programming central computer (PCM) control unit

Includes:

Connecting and disconnecting battery charger

Connecting and disconnecting PIWIS Tester
Labor time: 73 TU
 Damage Number WPN9 066 000 1
Overview of the optimizations of the software update

Overview:
Description
Market relevance /

affected vehicles
The activation of the adjustment of the air conditioning is displayed in the

PCM inverted.
Only for right-hand drive

vehicles
The designations in the climate menu and the settings for the air conditioning in PCM for the footwell “warm” and “cold” are inconsistent.
Only for Swedish market
WiFi pop-ups appear too often in the PCM.
Unrestricted
When transferring a route via the MyPorsche app, the intermediate destinations are only titled as “offroad” in the PCM route overview.
Connect markets
When starting up the PCM, the PCM remains in the loading spinner (rotating

circle).
Unrestricted
The Porsche logo is displayed permanently when the PCM is started.
Unrestricted
Return to the introduction  Technical Information '9X00IN Introduction'
Additional instructions if programming is aborted

Information

If individual programming steps or reworking could not be carried out correctly, see Workshop Manual for

the basic procedure for control unit programming using the PIWIS Tester  Workshop Manual '9X00IN

Basic instructions and procedure for control unit programming using the PIWIS Tester – section on “Fault

finding”'

In the event of a fault, logging must always be created during programming using •Ctrl“ and •L“ using

the PIWIS Tester.

As a general rule, if programming is aborted during programming, programming must be continued.

The entire sequence can be started again at any time using the campaign code. The control unit that has

already been programmed is skipped, or programming is started via the integration test. Starting to use

the integration test is faster.

You can also find further information and instructions specifically for the PCM update, in the table below:
AfterSales
Nov 3, 2023

Page 5 of 8
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Service

WPN9
Work

Procedure:
Technical Information
ENU 160/23
Control unit:
Situation:
Action:
Integration test
The integration test shows a

“red” result despite successful

programming
•
Carrying out the integration

test multiple times
Central computer (PCM)
The central computer freezes

while loading
•

•
Restarting J1K2T

Perform PCM factory reset

using the guided PIWIS

Tester procedure
Central computer (PCM)
The central computer control

unit cannot be accessed
•
Pulling out fuse for central

computer control unit –>

Removing fuse for control

unit –> Ignition on –>

Ignition off –> Re-insert fuse
Central computer (PCM)
Programming of the central

computer (PCM) aborts when - >Fault 33 is detected
•
Fault 33 is displayed in the

central computer display

during programming

Start the update in the

Developer menu on the

central computer (PCM).

The update may only be

started from the Developer

menu in this case because

the PCM is already in the

Developer menu

If the update still cannot

be performed –> replace

central computer (PCM)
•
•
Central computer (PCM)
During the tester procedure,

a message appears reporting

that the software is already

up-to-date
•
•
Nov 3, 2023

Page 6 of 8
AfterSales
In the Tester, 2020 is

displayed as the vehicle

type in the top line next to

model year

Re-write vehicle order using

PIWIS Online
Service
Technical Information

Central computer (PCM)
160/23 ENU WPN9

During the tester procedure,

a message appears reporting

that the software is already

up-to-date
•

•
•
•
9
Checking the software

release

If the software release

is lower than 3397,

WMA5/WMA6/AMB5 was

not performed correctly!

Updating PCM to software

3397 as described in TI

WMA5/WMA6/AMB5

Restarting J1K2T
Central computer (PCM)
No start of programming
•
Programming is started

via the additional menu and

not in the central computer

(PCM) control unit under

Service / repairs as

described in the TI
Central computer (PCM)
Programming is not started or

programming is interrupted
•
For other topics that are not

listed in the TI, a PRMs ticket

must be created before

replacing the PCM system
Back to programming  Technical Information '9X00IN Re-programming control unit for central

computer (PCM) - scope 2'
Checklist

Checklist:
Work step:

The checklist is an aid for carrying out the campaign and does not replace the TI information.
Completed:
1. Charger set to 14.8 V and charging mode?

2. Internet connection for PIWIS Tester active?

3. USB stick prepared with the correct PIUS part number?

4. Select Guest account from the central display (PCM) and activate Privacy mode?

5. Central computer control unit programmed?

Read the warnings displayed on the Tester!

6. Fault memory deleted?

7. Integration test error-free?

8. Is the battery charger set to a charge voltage of 14.4 V?

9. Campaign entered in the Warranty and Maintenance logbook?

Return to the introduction  Technical Information '9X00IN Introduction'
AfterSales
Nov 3, 2023

Page 7 of 8
9
Service

WPN9
Technical Information
ENU 160/23
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.
Nov 3, 2023

Page 8 of 8
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