Service

Technical Information

106/21 ENU

AMB5

9

AMB5 - Re-Programming Power Electronics (Stop Delivery/Recall Campaign)

Revision:

This bulletin replaces bulletin Group 9 106/21 AMB5 (Y1A, Y1B), dated July 14, 2021.

Model Year:

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.

Model Line:

Taycan (Y1A)
Taycan Cross Turismo (Y1B)

Concerns:

Power electronics and engine electronics (DME)

Information:

Due to an internal software error in the high-voltage power electronics, there is a possibility
that the warning message "Drive system control fault Park vehicle safety" will be displayed in
the instrument cluster on the affected vehicles.
If this is the case, the possibility of the drive system switching off sporadically while driving cannot be
ruled out and it may be necessary to park the vehicle safely. The customer can start the vehicle again
after switching the ignition off and on again.

Action required: •
•

Re-program the power electronics and engine electronics (DME control unit) using the PIWIS Tester
with test version 40.550.040 (or higher) installed.
Depending on the software version of the individual control units installed in the vehicle, other control
units must also be re-programmed or coded.

Information
Each vehicle affected by this measure has been assigned exactly one scope, which includes the
measures required for updating the software.
For details of the exact scope of this campaign that is assigned to each vehicle, see PCSS Vehicle Information.
An overview of the corresponding action required for each scope can be found in the table below.

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Overview of scopes:
Allocation

Scope of work for control unit programming

Scope 1:

•
•
•
•

VR8.6
VR8.7
VR12.1.1
Power electronics

Scope 2:

•
•
•

VR8.7
VR12.1.1
Power electronics

Scope 3:

•
•

VR12.1.1 - Model year 2020 vehicles
Power electronics

Scope 4:

•
•

VR12.1.1 - Model year 2021 vehicles
Power electronics

Scope 5:

•

Power electronics

Information
After each completed programming session, a working log must be created and, after the campaign has
been completed, will be uploaded to the quality line using the PIWIS Tester.
Affected
vehicles:

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

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'.
Tools:

•
•
•

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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 test version 40.550.040 (or higher) installed.
USB storage medium, type A+C 32 GB (for PCM update), Part No. V04014999WW000

AfterSales

Service

Technical Information

106/21 ENU

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Information
The central computer (PCM) software update is performed using a USB storage medium. The software
version that is specific to each region must be downloaded using the software tool PiUS (Porsche integrated Update Service) and installed on a blank USB storage medium.
Pay particular attention to the following:
•

For this PCM software update, the USB storage medium USB Type A+C 32 GB with the part number
V04014999WW000 must be used.

•

To use the software tool, one blank or re-writable USB storage medium is required for each individual software.

•

The software available in PiUS must only be used in accordance with the instructions provided in a
Technical Information published for this purpose.

The software mentioned here must only be used on the vehicles assigned to the campaign. Damage
to the central computer cannot be ruled out if the software is used on other vehicles.
You will find further information on how to install and use the PiUS software tool in the PPN portal under
*PiUS (Porsche integrated Update Service) goes live*.
Overview of PiUS software versions – PCM update VR12.1.1
Part No.

Designation
– Region

Vehicle allocation

9J1919360C

PCM update software
– Europe
– RoW

I-no. ER1/ER2

9J1919360D

PCM update software
– North America
– Mexico

I-no. ER3/ER4

9J1919360E

PCM software update
– Japan
– China
– Korea
– Taiwan

I-no. ER5/ER6/ER7/ER8

Preparatory work - all scopes
NOTICE
Fault entry in the fault memory and control unit programming aborted due to undervoltage.
•

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.

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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 WiFi 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.



Position the driver's key with the back facing forward upright between the holding struts in the rear
cupholder (emergency start tray) to ensure a permanent radio link between the vehicle and remote
control.
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
To carry out the campaign, the PIWIS Tester must be online and logged into the Porsche Partner Network
(PPN).

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Technical Information

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Information
Use the new PIWIS Tester data cable to carry out the
campaign. The difference between the old  PIWIS Tester
data cable -1- and new  PIWIS Tester data cable -2data cable is shown in the illustration.
If the connection between the vehicle and PIWIS Tester is
interrupted, check the data cable for the PIWIS Tester for
signs of damage. If the data cable is damaged, it must be
replaced. To do this, follow the instructions in the PPN
for "Returning faulty USB cable caps" (PPN portal > Dr
Ing. h.c. Porsche AG > Aftersales > Workshop > PIWIS >
Documents).

Information
The procedure described here is based on the PIWIS
Tester 3 software version 40.350.035.
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.
Work Procedure: 1

PIWIS Tester data cable

Connect a suitable battery charger, e.g. Battery charger 90A, to the jump-start terminals in the
luggage compartment and switch it on.
Information
To prevent any excessive and potentially noticeable heating of the charging clamp of the negative
cable while charging the 12-volt vehicle electrical system battery using an external battery charger,
always check the following points:
•

Always connect the charging terminal of the negative cable vertically from above to the ground
point for the external power connection. Make sure that the charging clamp cable is routed
loosely to prevent the charging clamp from tilting sideways at the ground point.

•

When connecting the charging clamp, make sure that it is a sufficient distance away from
peripheral parts (e.g. pneumatic supply line for air-spring strut).

•

Before raising the vehicle using a lifting platform, always disconnect the battery charger
completely from the vehicle in order to prevent the connecting line of the charging terminal from
becoming taut and the charging terminal tipping sideways at the ground point as a result.

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2

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.

3

Connect 9900 - PIWIS Tester 3 to the vehicle
communication module (VCI) via the USB cable.
Then, connect the communication module to the
vehicle and switch on the PIWIS Tester.
Operate the PIWIS Testervia the power supply
unit due to the long programming time.

Emergency start tray

4

Establish operational readiness (switch on ignition).

5

On the PIWIS Tester start screen, call up the 'Diagnostics' application.
The vehicle type is then read out, the diagnostic application is started and the control unit selection
screen is populated.

6

Create vehicle analysis log (VAL) using the PIWIS Tester.
Mark the vehicle analysis log you have just created with the attribute "Pre-VAL" and after carrying
out the campaign, return it using the PIWIS Tester.
Then, perform the control unit update in accordance with the scope that is uniquely
assigned to the respective vehicle.
For details of the exact scope of this campaign that is assigned to each vehicle, see PCSS Vehicle
Information.

7

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Delete the working logs currently stored on the Tester.
7.1

In the control unit overview, select •F10“ ('Logs') in the menu bar at the bottom and select
the working log.

7.2

Mark and erase the stored working logs.

Allocation

Software release

Action required

Scope 1:

•
•
•
•

VR8.6
VR8.7
VR12.1.1
Power
electronics

Not relevant for this model year.

Scope 2:

•
•
•

VR8.7
VR12.1.1
Power
electronics

Not relevant for this model year.

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Technical Information

106/21 ENU

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Scope 3:

•
•

VR12.1.1
Power
electronics

Not relevant for this model year.

Scope 4:

•
•

VR12.1.1
Power
electronics

 Technical Information '270689 Updating software for

•

Power
electronics

 Technical Information '270689 Programming power

Scope 5:

various control units - Scope 4'

electronics - Scope 5'

Updating software for various control units - Scope 4
WARNING
Electrically moved side windows and rear spoiler