Service

Technical Information

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AJ13 - Re-programming Electric Power Steering Control Unit (Delivery Stop/Recall
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:

As of 2017 up to 2019

Model Line:

Panamera (971)

Subject:

Control unit for electric power steering

Information:

There is a possibility that the electric power steering may not be available for a limited period
of time sporadically on the affected vehicles due to a software error.
Greater force will then be required to turn the steering wheel. Power steering will be fully available again
after switching the ignition off and on again.

Remedial
Action:

Re-program control unit for electric power steering using the PIWIS Tester with software version
37.900.010 (or higher) installed.
Information
During the campaign, the control unit for electric power steering is re-programmed and then re-coded
automatically.
It takes about 6 minutes to program and code the control unit.

Affected
Vehicles:

Only the vehicles assigned to the campaign (see also PIWIS Vehicle information). This campaign affects
17,667 vehicles in North America.

Required tools
Tools:

•
•

9900 - PIWIS Tester 3 with PIWIS Tester software version 37.900.010 (or higher) installed
Battery Charger/Power Supply - Suitable for AGM Type batteries, recommended current rating of
90A fixed voltage 13.5V to 14.5V.

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Technical Information

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

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 or power supply, suitable for
AGM type batteries, recommended current rating of 90A fixed voltage 13.5V to 14.5V.
NOTICE

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

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



During control unit programming, always connect 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 into the front left storage compartment in the center
console to guarantee a continuous radio link between the vehicle and the driver's key.

Work Procedure: 1

Carry out general preliminary work for control unit programming as described in  Workshop
Manual 'Basic instructions and procedure for control unit programming using the PIWIS Tester'.

Re-programming control unit for electric power steering
Information
The procedure described here is based on the PIWIS Tester 3 software version 37.900.010.
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

Re-program control unit for electric power steering.
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'.

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For specific information on control unit programming during this campaign, see the table
below:
Required PIWIS Tester software version:

37.900.010 (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:

U3V8L

Programming sequence:

Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
The control unit for electric power steering is
re-programmed and then re-codedautomatically during the programming sequence.
Do not interrupt programming and coding.

Programming time (approx):

6 minutes

Software version programmed during this
campaign:

2110

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

•
•

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

 Workshop Manual '9X00IN Basic instructions and

Following control unit programming, the software
version can be read out of the "Power steering"
control unit in the 'Extended identifications' menu
using the PIWIS Tester.
Switch ignition off and then on again.
Repeat control unit programming by entering
the programming code again.

procedure for control unit programming using the
PIWIS Tester - section on "Fault finding"'.

Reading out and erasing fault memory
Information
Brief breaks in communication between the control units during programming and coding can result in
fault memory entries in all control units in the vehicle system, which might not be deleted automatically.
In addition to the automatic deletion of the fault memories during programming, the fault memories
of all control units must therefore be read out and deleted again as described below after each
programming and coding process.

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Work Procedure: 1
2

Technical Information

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

3

Once you have read out the fault memories, check
the fault memory entries.
Information
If control units are found to have faults that are not
Erasing fault memories
caused by control unit programming, these must first
be found and corrected. This work cannot be invoiced under the workshop campaign number.

4

Press •F8“ to delete fault memory entries.

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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•

Switch off the ignition.

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key.

•

Wait approx. 1 minute before unlocking the vehicle again.

•

Start the engine, leave it running for a short time and then stop it again.

•

Switch off the ignition and wait approx. 10 seconds before switching it back on again.

•

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.

Control unit selection

Concluding work
Work Procedure: 1

Teach steering lock settings.
1.1

Start the engine.

1.2

Move steering wheel into center position. The steering wheel must remain in centre position
without force and without moving.

1.3

Turn the steering wheel fully to the left and hold it there for at least 2 seconds.

1.4

Turn the steering wheel fully to the right and hold it there for at least 2 seconds.

1.5

Move steering wheel into center position.

1.6

Check the teaching process.
To do this, select 'Software limit stop' in the 'Actual values/input signals' menu of the "Power
steering" control unit using the PIWIS Tester and press •F12“ ('Next') to confirm your
selection.
The status of each steering lock can be read out in the 'Value' field in the overview that is then
displayed.

2

Carry out general concluding work for control unit programming as described in  Workshop
Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS
Tester'.

3

Enter the campaign in the Warranty and Maintenance booklet.

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Warranty processing

Information
The specified working time was determined specifically for carrying out this campaign and includes all
necessary preliminary and subsequent work.
The working time may differ from the working times published in the Labor Operation List in PIWIS.
Scope:

Working time:
Re-programming control for electric power steering
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out and erasing fault memory
Teaching steering lock settings

Labor time: 63 TU

 Damage Code AJ13 099 000 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.

© 2018 Porsche Cars North America, Inc.

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