Service

Technical Information

160/19 ENU

4562

4

Symptom: Brakes - Error Message "Brake System Fault" Appears: Re-programming PSM
Control Unit (SY 160/19)
Model line:

Macan (95B)

Model Year:

As of 2019 up to 2020

Subject:

PSM control unit

Symptom:

•
•
•

A brake system fault is indicated at times by the white warning message "Fault - Service necessary –
Driving permitted" on the multi-function display in the instrument cluster.
The fault memory entry "0D2602 - Vacuum sensor – below lower limit value" can also be stored in the
fault memory of the PSM control unit.
Pedal force and braking power are unchanged.

Information
If there is a problem in relation to pedal force and/or braking power, the remedial action described below
is not relevant and will not correct the problem.
In this case, the cause must first be found and corrected separately.
Cause:

Due to the new generation of engines with modified components used for Macan vehicles from model
year 2019 onwards, vacuum monitoring by the PSM control unit may be too sensitive particularly after
the engine is restarted using Start/Stop and after pressing the brake pedal during the previous Stop
phase (e.g. because the "Hold" function was activated).
The fault symptom can occur in certain geographical and/or climatic conditions (e.g. driving at sea level
and/or in high-pressure weather conditions).

Remedial
Action:

In the event of a customer complaint and if the PSM software version is less than "0530", re-program the
PSM control unit.
Information
The total time required for control unit programming is approx. 4 minutes.

Date of
Introduction:

New software version "0530" used from:
Date

November 25, 2019

VIN

WP1AA2959LLB09246
WP1ZZZ95ZLLB36773

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Service

Technical Information

ENU 160/19

4562

Required tools
Tools:

•
•

9900 - PIWIS Tester 3 with installed PIWIS Tester software version 39.050.000 (or higher)
Battery charger with a current rating of at least 90 A, e.g. Battery charger 90A.

Preparatory work
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.



Before getting started, connect a suitable battery charger with a current rating of at least 90 A to the
jump-start terminals.
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, 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 vehicles with Porsche Entry & Drive, programming cannot be started
or will be interrupted.



Switch on the ignition using the original driver’s key. To do this, replace the control unit in the ignition lock
with the original driver’s key if necessary.

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 - section on
"Preliminary work"'.

Re-programming PSM control unit
Work Procedure: 1

The basic procedure for programming a control unit is described in the Workshop Manual 
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming - section
on "Programming"'.
Specific information on control unit programming in the context of this Technical Information:

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AfterSales

Service

Technical Information

160/19 ENU

4562

4

Required PIWIS Tester software version:

39.050.000 (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:

J5T3U

Programming sequence:

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

Programming time (approx):

4 minutes

Software version programmed during this
campaign:

0530

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 PSM control unit in the
 'Extended identifications' menu using the PIWIS
Tester.

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

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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4562

Technical Information

ENU 160/19

1.2

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.

1.3

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 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:

1.6

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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.

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

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Technical Information
2

160/19 ENU

4562

4

Perform PSM sensor calibration.
2.1

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

2.2

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

2.3

Select 'PSM sensor calibration' in the menu
and press •F12“ ('Next') to confirm  PSM
sensor calibration.

PSM sensor calibration
2.4

Select 'Calibrate axial-acceleration
sensor' in the PSM sensor calibration
overview and press •F12“ ('Next') to confirm
your selection  PSM sensor calibration.

2.5

Comply with the displayed preconditions and
press •F8“ ('Execute') to confirm.

2.6

Follow the instructions on the PIWIS Tester
while the axial-acceleration sensor is being
calibrated.

PSM sensor calibration

Once calibration is completed successfully, a tick will appear in the "Result" box for the axialacceleration sensor on the PIWIS Tester display.
If calibration of the axial-acceleration sensor is not completed successfully, calibration must
be repeated.
2.7

Press •F12“ ('Next') to confirm successful calibration.

2.8

Select 'Lateral-acceleration sensor' in the PSM sensor calibration overview and proceed
in the same way as for steps 2.5 to 2.7 in order to calibrate the lateral-acceleration sensor.

2.9

Select 'Calibrate pressure sensors' in the PSM sensor calibration overview and proceed in
the same way as for steps 2.5 to 2.7 in order to calibrate the pressure sensors.

2.10

Press •F11“ ('Back') to return to the start page of the 'Maintenance/repairs' menu.

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Technical Information

ENU 160/19

4562
3

Select the 'Overview' menu and press •F11“ ('Back') to return to the control unit selection screen.

4

Switch off the ignition.

5

Disconnect the PIWIS Tester from the vehicle.

6

Switch off and disconnect the battery charger.

Invoicing
Invoicing:

For documentation and warranty invoicing, enter the labor operation and PQIS coding specified below in
the warranty claim:

APOS

Labor operation

45302500

Programming hydraulic unit

I No.

PQIS coding:
Location (FES5)

45620

PSM control unit

Damage type (SA4)

1143

Programming error

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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