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Spare Parts Requirements for High-Voltage Components - Check and Update Software as
Necessary (44/20)
Change overview
Version

Date

Change

0

April 8, 2020

First publication

1

July 28, 2020

•
•
•

Vehicle Type:

Taycan (Y1A)

Model Year:

As of 2020

Subject:

Spare parts requirements for
•
•
•

SW versions updated
PIWIS Tester release
updated
Information about WLG2
added

High-voltage battery
Battery isolator (HV battery E-box)
Control unit for battery monitoring (HV battery control unit)

Information:

If one of the components specified above needs to be replaced, the software version in the
high-voltage battery control unit must be checked after installation in the vehicle and a
software update should be performed if necessary.

Remedial
Action:

Check the software version in the "high-voltage battery" control unit and update it if necessary.
Information
If the vehicle is affected by workshop campaign WLG2 and this has not yet been carried out, this
campaign must also be carried out during the workshop visit.
Otherwise, the functionality of the vehicle cannot be guaranteed because of the different software
versions in the vehicle.

Information
The total time required for control unit programming is approx. 6 minutes.

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Software:

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Overview of software version:
Control unit

SW (old)

SW (new)

High-voltage battery

E842 or E860

E870

Information
If the software version stored in the high-voltage battery control unit is E842, the control unit must be
re-programmed.
If a different software version is stored in the high-voltage battery control unit, this technical information
does not apply.
Parts Info:

Overview of affected components:
Part No.

Designation

9J1915100xx

High-voltage battery (93kWh)

9J1915099xx

High-voltage battery (79kWh)

9J1915251x

Battery isolator (HV battery E-box) — complete

9J1915234x

Control unit for battery monitoring ( HV battery
control unit)

Tools:
Information
The Taycan (Y1A) 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'.
•

•

Battery charger with a current rating of at least 90 A and - if required - also with a current- and
voltage-controlled charge map for lithium starter batteries, e.g. VAS 5908 90 A battery
charger
9900 - PIWIS Tester 3 with PIWIS test software version 39.600.015 (or higher) installed.

Preparatory work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low voltage.

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•

Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which
can result in one or more fault entries and the abnormal termination of the programming process.



Before starting control unit programming, connect a suitable battery charger with a current rating of at
least 90 A to the vehicle.
NOTICE

Control unit programming will be aborted if the WLAN connection is unstable.
•

An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.



During control unit programming, always connect the PIWIS Tester to the vehicle communication module
(VCI) via the USB cable.
NOTICE

Control unit programming will be aborted if the driver's key is not recognized
•

If the driver's key is not recognized in the vehicle, programming cannot be started or will be interrupted.



Place the driver's key with the back facing down in the area in front of the storage compartment under
the armrest (emergency start tray) in order to guarantee a permanent radio link between the vehicle and
driver's key.
NOTICE

Programming interrupted
•

Malfunctions in control unit

•

Risk of damage to control unit



Route the line between the vehicle communication module (VCI) and diagnostic socket on the vehicle
without tension and make sure that the connector is inserted fully into the diagnostic socket.



Check that the rechargeable battery for the PIWIS Tester is charged sufficiently. Connect the PIWIS Tester
to the power supply unit if necessary.

Information
The procedure described here is based on the PIWIS Tester 3 software version 39.200.031.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed.
A discrepancy may arise with later software versions for example.

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Work Procedure: 1

Technical Information

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Carry out general preliminary work for control unit programming as described in  Workshop
Manual '9X00IN Basic instructions and procedure for control unit programming - section on
"Preliminary work"'.

2

Connect a suitable battery charger, e.g. battery charger 90A, to the jump-start terminals and
switch it on.

3

Position the driver's key with the back facing
forward upright between the holding struts in the rear
cupholder (emergency start tray) to guarantee a
permanent radio link between the vehicle and remote
control  Emergency start tray -arrow-.

4

9900 - PIWIS Tester 3 must be connected to the
vehicle communication module (VCI) via the USB
cable. Then connect the communication module
to the vehicle and switch on the PIWIS Tester.

5

Establish operational readiness (switch on ignition).

6

On the PIWIS Tester start screen, call up the 'Diagnostics' application.

Emergency start tray

The vehicle type is then read out, the diagnostic application is started and the control unit selection
screen is populated.
7

Select the high-voltage battery control unit.
7.1

Select the Extended identification menu.

7.2

Check the software version.
•

Software version E870  Check whether the vehicle is affected by campaign WLG2.
If it is and if the campaign has not yet been carried out, carry out the campaign. End of
remedial action.

•

Software version E842 or E860  Re-program control unit, see  Technical Information '9X00IN Re-programming control unit'.

Re-program the high-voltage battery control unit
Work Procedure: 1

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Specific information on control unit programming in the context of this Technical Information:

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Required PIWIS Tester software version:

39.600.015 (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:

F4C2J

Programming sequence:

Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During programming, the high-voltage battery
control unit is re-programmed and then re-coded
automatically.
Do not interrupt programming.

2

Programming time (approx):

6 minutes

Software version programmed during this
campaign:

E870

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

 Workshop Manual '9X00IN Basic instructions and

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

Repeat control unit programming by restarting
programming.

Following control unit programming, the software
version can be read out of the high-voltage battery
control unit in the  'Extended identifications' menu
using the PIWIS Tester.

procedure for control unit programming - section on
"Fault finding"'.

Check whether the vehicle is affected by workshop campaign WLG2. If it is and if the campaign has
not yet been carried out, carry out the campaign.

Concluding work
Work Procedure: 1

Read out and erase the fault memories of all control units.
1.1

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

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1.2

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

1.3

Once you have read out the fault memories,
check the fault memory entries.
Information
Erasing fault memories
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 must be invoiced using a separate warranty claim.

1.4

Press •F8“ to delete fault memory entries.

1.5

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.

•

Establish bus idle on the vehicle.

•

Establish operational readiness (switch on ignition).

•

End operational readiness and restore it after a waiting time of approx. 10 seconds.

•

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

2

End operational readiness (switch off ignition).

3

Disconnect the PIWIS Tester from the vehicle.

4

Switch off and disconnect the battery charger.
Control unit selection

Invoicing
Invoicing:

For documentation and warranty invoicing, enter the PQIS coding specified below in the warranty claim:
I No.

APOS

Labor operation

27940150

Checking high-voltage battery control unit

27942555

Programming high-voltage battery control unit
PQIS coding:

Location (FES5)

27080

High-voltage battery

Damage type (SA4)

9735

Repair in accordance with PAG instructions

References:

 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming'

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.

© 2020 Porsche Cars North America, Inc.

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