No. 197-22

Service
Technical Information
197/22 ENU
4890
4
Lane Keep Assist does not Function After Replacing the Power Steering Gear:
Re-Programming Power Steering Control Unit (197/22)
Vehicle Type:
911 (992)
Model Year:
2020
Equipment:
Lane Keep Assist incl. traffic sign recognition
Concerns:
Power steering control unit
Reason:
Replacing the power steering gear on the vehicles specified above can mean that Lane Keep Assist is no
longer available.
Cause:
This behavior is caused by the software version 430 pre-installed on the power steering gear, which
causes incompatibility on model year 2020 (L) vehicles.
Action required: In the event of a customer complaint or after replacing the power steering gear, the software version of
the power-steering control unit must be checked and re-programmed if necessary using the PIWIS Tester
with PIWIS Tester software version 41.375.040 (or higher) installed.
Required tools
Tool:
•
•
Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90A. For
further information about the battery chargers to be used, see the corresponding Workshop Manual.
 Workshop Manual '270689 Charging vehicle electrical system and battery'
9900 - PIWIS Tester 3 with PIWIS Tester software version 41.375.040 (or higher) installed
Preparatory work
NOTICE
Fault entry in the fault memory or control unit programming aborted, as the case may be, 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 commencing work, connect a suitable battery charger with a charging current of at least 90 A to
the jump-start terminals in the engine compartment.
NOTICE
Control unit programming will be aborted if the Wi-Fi connection is unstable.
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Technical Information
ENU 197/22
4890
•
An unstable Wi-Fi connection can interrupt communication between the PIWIS Tester II 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 detected.
•
If the driver’s key is not detected 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 ensure 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 '9X00IN Basic instructions and procedure for control unit programming – chapter on
“Preliminary work”'.
Checking software version of power steering control unit
Work Procedure: 1
Check software version of the power steering control unit.
1.1
Select Power steering control unit.
1.2
Select the Extended identifications menu.
1.3
Check software version of thepower steering control unit.
1.3.1
If the software version is '0120' (911 Carrera vehicles) or '0220' (911 Turbo
vehicles), the control unitis already at the required version; continue with 
Technical Information '9X00IN Concluding work'.
1.3.2
If the software version is earlier than '0430', re-program the power steering
control unit.  Technical Information '9X00IN Re-programming power steering
control unit'
Re-programming power steering control unit
Information
The procedure described here is based on the PIWIS Tester 3 software version 41.375.040.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed. Deviations may occur with later software versions, for example.
Work Procedure: 1
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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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Service
Technical Information
197/22 ENU
4890
4
For specific information on control unit programming during this campaign, see table
below.
Required PIWIS Tester software version:
41.375.040 (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:
L7S6F
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.
Programming time (approx.):
6 minutes
Software version programmed during this
campaign:
•
•
911 Carrera vehicles: 0120
911 Turbo vehicles: 0220
Following control unit programming, the software
version can be read out from 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:
 Workshop Manual '9X00IN Basic instructions
Procedure in the event of a termination in the
control unit programming:
Repeat control unit programming by restarting
programming.
and procedure for control unit programming using
the PIWIS Tester - section on “Fault finding"'.
Concluding work
Work Procedure: 1
2
Carry out general reworking for control unit programming as described in  Workshop Manual
'9X00IN Basic instructions and procedure for control unit programming using the PIWIS Tester Reworking section'.
Teach the power steering gear if necessary.  Workshop Manual '489025 Teach power steering
gear'
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Technical Information
ENU 197/22
4890
WARNING
Function tests as part of a test drive on public roads
•
Endangering other road users

Only carry out the required tests if the road, weather, traffic and regulations are conducive to doing so.
3
Check the function of Lane Keep Assist during a test drive.
Information
Lane Keeping Assist uses a camera to detect divider line markings on the road and helps the driver
to stay in lane by making corrective steering inputs (active at approximately 65 km/h – 250 km/h).
Invoicing
For documentation and invoicing in the event of a warranty, state the work items required depending on
the scope of work and the specified PCSS encryption in the warranty claim:
APOS
Labor operation
48900101
Check power steering gear
48902551
Programming power-steering gear
I No.
PCSS encryption:
Location (FES5)
48900
Power steering gear
Damage type (SA4)
1111
incompatible software version
References:
 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester'
 Workshop Manual '489025 Teach power steering gear'
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.
© 2022 Porsche Cars North America, Inc.
Oct 28, 2022
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