Service

Technical Information

145/21 ENU WML2

2

WML2 – Re-Programming 22 kW High-Voltage Charger (OBC) (Workshop Campaign)

Introduction
Revision:

This bulletin replaces bulletin Group 2 145/21 WML2, dated October 26, 2021.

Model Year:

As of 2021

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.

Vehicle Type:

Taycan (Y1A)
Taycan Cross Turismo (Y1B)

Concerns:

22 kW high-voltage charger (OBC)

Information:

Updated software is available for the 22 kW high-voltage charger (OBC). The software contains
improvements, enhanced functions and troubleshooting for the following topics:
•
•
•
•

Improved and enhanced "Plug-and-Charge" (PnC) comfort function
Enhanced "smart charging" comfort function
The high-voltage battery cannot be charged fully (100% state of charge (SoC) is not reached) at
certain charging pedestals
DC charging at certain charging pedestals with a duty cycle of between 6.1 and 7% is not possible
(e.g. Signet charging stations)

Action required: Re-program the 22 kW high-voltage charger using the PIWIS Tester with software version 40.550.050 (or
higher) installed.

Required tools
Information
The Taycan (Y1A/Y1B) is equipped as standard with a lithium starter battery.
Lithium starter batteries must only be charged using a suitable battery charger that has a current
and voltage-controlled charge map.
For further information about the battery chargers to be used, see  Workshop Manual '270689
Charging battery/vehicle electrical system'.

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Tools:

EN

•
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Battery charger with a current rating of at least 90 A and also with a current and voltagecontrolled charge map for lithium starter batteries, e.g. VAS 5908 battery charger 90 A.
9900 - PIWIS Tester 3 with software version 40.550.050 (or higher) installed.

Re-programming 22 kW high-voltage charger (OBC)
Work Procedure: 1

The basic procedure for control unit programming is described in the Workshop Manual 
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester'.
For specific information on control unit programming in this sequence, see the table
below:
Information
Points to note in relation to programming:
After programming the 22 kW high-voltage charger (OBC), the central computer (PCM) settings
must be reset to factory settings.
Please speak with customers and let them know comfort settings in the vehicle are likely to be erased /
reset during this workshop campaign. It is recommended to offer assistance re-configuring those
settings if necessary. Online Software Updates should also be confirmed through the MyPorsche
portal to ensure infotainment system updates take place.
In addition, discuss Plug and Charge (PnC) with customers, since this functionality is newly introduced
by this software update. The PnC function relies upon backend system connections between Porsche
Charging Service and the Charge Point Operator (Electrify America, for example) to automatically
process payment of charging sessions. These system connections can take time to synchronize, with
a waiting time ranging from overnight to approximately one week.
Therefore, it is recommended to leave Plug and Charge Deactivated via the PCM menu Home →
Charging → Options[…] until at least one overnight resting period and at least one DC charging
session is successfully completed. After that, the customer can activate Plug and Charge in the
PCM and attempt DC charging via PnC authentication.
Required PIWIS Tester software
version:

40.550.050 (or higher)

Type of control unit programming:

Control unit programming using the 'Campaign' function
in the Additional menu on the PIWIS Tester by entering a
programming code.

Programming code:

E8W5P

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 versions starts as soon as programming and
coding is complete.

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Programming time (approx.):

8 minutes

Software version programmed
during this sequence:

•

Procedure in the event of
abnormal termination of control
unit programming:

•

1256

Following control unit programming, the software version
can be read out of the relevant control unit in the 'Extended
identifications' menu using the PIWIS Tester.

•

•

•

•

Procedure in the event of error
messages appearing during the
programming sequence:

High-voltage charger (OBC)

2

End and restore operational readiness (switch ignition
off and then on again).
Read out and erase the fault memory  Workshop
Manual '9X00IN Basic instructions and procedure for
control unit programming using the PIWIS Tester'.
Repeat control unit programming by entering the
programming code again, whereby extended logging
must be started using the key combination •Ctrl“ +
•L“.
Extended logging records diagnostic software data,
particularly vehicle communication data, which
is required for analysing the issues that caused
programming to be aborted.
If control unit programming is aborted a second time,
end operational readiness for approx. 15 minutes
(switch off ignition) and repeat the procedure described
here again.

 Workshop Manual '9X00IN Basic instructions and
procedure for control unit programming using the PIWIS
Tester - section on "Fault finding"'.

Concluding work
Important:

After programming the 22 kW high-voltage charger (OBC), the central computer (PCM) settings will be
reset to factory settings.

Work Procedure: 1

2

Reset PCM to factory settings.
1.1

Select the "Central computer" control unit in the control unit selection screen ('Over-view'
menu) and open the "Maintenance/repairs" screen.

1.2

Select the "Reset to factory settings" function and follow the instructions on the screen.

Read out and erase the fault memories of all control units.
2.1

Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.

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2.2

Select the function “Read all fault memories
and erase if required” and press •F12“
('Next') to confirm your selection  Erasing
fault memories.
The fault memories of the control units are
read out.

2.3

Once you have read out the fault memories,
check the fault memory entries.
Erasing fault memories
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.

2.4

Press •F8“ to delete fault memory entries.

2.5

Press •F12“ ('Yes') in response to the question as to whether you really want to delete all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If fault memory entries for individual control units cannot be deleted, proceed as follows:

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•

End operational readiness (switch off ignition).

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key and remove the driver's key from the
proximity of the vehicle (approx. 10 metres).

•

Wait approx. 15 minutes before unlocking the vehicle again.

•

Restore operational readiness (switch on ignition).

•

Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore
communication with the vehicle.

•

Read out the fault memory again and delete any fault memory entries that are stored.

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145/21 ENU WML2

2

Once you have erased the fault memories,
select the 'Overview' menu to return to the
control unit selection screen  Control unit
selection.

Manually retract the rear spoiler, which extended
automatically during programming.
3.1

Select the 'Rear spoiler' control unit in the
control unit selection screen ('Overview'
menu) and press •F12“ ('Next') to confirm.

3.2

Control unit selection
Once the rear spoiler control unit has been found and is displayed in the overview, select the
'Maintenance/repairs' menu.

3.3

Select the function ‘Teach rear spoiler’ and press •F12“ (‘Next’) to confirm.

3.4

Read the instructions and confirm by pressing •F12“ ('Next').

3.5

Meet the displayed conditions that must be checked manually and tick the relevant 'Status'
box.

3.6

Select the Teach rear spoiler function and press •F8“ ('Execute') to confirm.

3.7

Once the rear spoiler has been taught and retracted fully, select the 'Overview' menu to
return to the control unit selection screen.

4

End operational readiness (switch off ignition).

5

Disconnect the PIWIS Tester from the vehicle.
Information
Connect the PIWIS Tester to a network as soon as possible and log into the PPN in order to transfer
the backup documentation created during this campaign to the PAG systems.

6

Switch off and disconnect the battery charger.

7

Enter the campaign in the Warranty and Maintenance booklet.

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Warranty processing
Scope 1:

Re-programming 22 kW high-voltage charger (OBC)
Working time:
Re-programming 22 kW high-voltage charger (OBC)
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out and erasing fault memories

Labor time: 53 TU

 Damage Code WML2 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.

© 2021 Porsche Cars North America, Inc.

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