No. 211-23-1

Symptom-based workshop manual
Service
211/23 ENU
4530
4
Brake Symptom - Yellow Warning Message “PSM Failure” in the Instrument Cluster:
Checking Hydraulic Unit and Re-Program PSM Control Unit (SY 211/23)
Vehicle Type:
Cayenne E-Hybrid (9YA / 9YB) / Cayenne Turbo S E-Hybrid (9YA / 9YB)
Model Year:
As of 2022 up to 2023
Concerns:
Hydraulic unit
Symptom:
The yellow warning message “PSM failure” lights up in the instrument cluster.
At the same time, a brake pedal travel that is subjectively perceived as “too long” can occur.
The following fault memory entry is stored in the fault memory of the PSM control unit and/or the brake
booster control unit:
•
Remedial
Action:
P05FF00 - Brake pressure sensor / brake pedal travel sensor, deviation
If there is a complaint, carry out functional test of the hydraulic unit and, depending on the test result:
•
Bleed the brake system and re-program the PSM control unit.
or
•
Replace PSM control unit, including hydraulic unit, bleed brake system and re-program PSM control
unit.
Information
The minimum programming requirement is the PIWIS Tester software release: 42.500.020
Required parts and materials
Parts Info:
Material:
Required parts if the PSM control unit including hydraulic unit needs to be replaced.
Part No.
Designation
– Location
Quantity
9Y0614508SY
 Hydraulic unit
1 piece
9Y0698009
 Set of seals
– Supply line (to reservoir) to hydraulic unit
1 piece
Required materials (usually already available in the Porsche Center):
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Symptom-based workshop manual
ENU 211/23
4530
Part No.
Designation
– Location
Quantity
00004321086
 Brake fluid, 30-liter/ 7.9 gal container
- Brake system
Quantity as required
(Approx. 1.25
liter/ 42.27 fl oz
are required for
conventional bleeding
and approx. 2.5
liter/ 84.53 fl oz are
required for replacing
the hydraulic unit)
Required tools
Tools:
•
•
•
•
P90999 - PIWIS Tester 4
Battery charger with a current rating of at least 90 A, e.g., VAS 5908 90A battery charger. For
further information about the battery chargers to be used, see the corresponding Workshop Manual.
 Workshop Manual '270689 Charging vehicle electrical system and battery'
VAS 6860 - Brake Filling and Bleeding Equipment
VAS 6122 - Engine plug set
Checking hydraulic unit, replace if necessary, and re-program PSM control unit
Work Procedure: 1
Check hydraulic unit.
1.1
Connect and switch on the battery charger.
1.2
Connect the Tester to the vehicle and start it. Switch on ignition.
1.3
In the control unit Overview, select the control unit “Brake electronics (PSM incl. parking
brake)”.
1.4
Select the “Service and repairs” menu and then perform and assess the “Functional
testing of the hydraulic unit” function with menu guidance.
Assessment
( )
Hydraulic unit function OK
Action
Bleed the brake system and re-program
the PSM control unit.
Continue with Step  2.
(✗)
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Hydraulic unit function not OK
AfterSales
Replace PSM control unit incl. hydraulic
unit.
For procedure, see:
Service
Symptom-based workshop manual
211/23 ENU
4530
4
 Workshop Manual '453019 Removing and
installing hydraulic unit' (includes bleeding
the brake system)
 Workshop Manual '453055 Replacing
PSM control unit' (includes automatic
programming of the PSM control unit)
End of action.
2
Bleed the brake system.
 Workshop Manual '470107 Bleeding brake system'
3
Re-program PSM control unit.
The basic work 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 - section on “Programming”'.
Specific information on control unit programming as part of this Technical Information:
Required PIWIS Tester software release:
42.500.020 (or higher)
Type of control unit programming:
Control unit programming using the ‘Automatic
programming’ function of the brake electronics
control unit.
“Brake electronics (PSM, including parking
brake)” control unit – “Coding/programming”
menu – “Automatic programming” function.
Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During the programming sequence, the brake
electronics (PSM, including parking brake)
control unit is re-programmed and then automatically re-coded.
Programming sequence:
Do not interrupt programming and coding.
Once the control units have been programmed and
coded, you will be prompted to switch the ignition off
and then back on again after a certain waiting time.
Backup documentation of the new software versions
is then performed.
Programming time (approx.):
Programming takes up to 15 minutes, depending
on equipment.
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Service
ENU 211/23
4530
Symptom-based workshop manual
Software programmed during this action:
PSM control unit software release: 0192
•
Following control unit programming, the software
release can be read out from the relevant control
unit using the PIWIS Tester in the menu  ‘Incremented identifications’.
Procedure in the event of error messages
appearing during the programming
sequence:
 Workshop Manual '9X00IN Basic instructions and
Procedure in the event of a termination in
the control unit programming:
Repeat control unit programming by restarting
programming.
procedure for control unit programming using the
PIWIS Tester'.
4
Read out and delete PSM control unit fault memories.
5
Exit the diagnostic application. Switch off ignition. Disconnect Tester from vehicle.
6
Switch off and disconnect the battery charger.
Labor position and PCSS encryption
Labor position:
APOS
Labor operation
45300190
Check hydraulic unit
47010715
Bleeding brake system
45305502
Replacing hydraulic unit
45302552
Programming hydraulic unit
I No.
PCSS encryption:
Location (FES5)
45300
Hydraulic unit
Damage type (SA4)
9735
Repair in accordance with PAG instructions
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.
© 2024 Porsche Cars North America, Inc.
Feb 19, 2024
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