NHTSA ID Number: 11011655
Manufacturer Communication Number: No. 211-23-1
TSB/Document Date: 2024-12-07
Summary
Symptom based workshop manual for a brake symptom - yellow warning message "PSM Failure" in the instrument cluster. Checking hydraulic unit and reprogram PSM control unit
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)
Change overview:
Release
Date
Change
0
02/19/2024
•
First publication
1
11/19/2024
•
Extended logging added
during the function test
Work procedure in
the section “Checking
hydraulic unit…” adapted
•
Vehicle Type:
Cayenne E-Hybrid
(9YA / 9YB) / Cayenne Turbo S E-Hybrid (9YA / 9YB)
Model Year:
As of 2019 up to 2021
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
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Symptom-based workshop manual
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4530
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):
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
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Page 2 of 5
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
Start extended logging using the key combination Ctrl + L before starting the function test
on the PIWIS Tester.
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Symptom-based workshop manual
1.5
211/23 ENU
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Select the “Service and repairs” menu and then perform and assess the “Functional
testing of the hydraulic unit” function with menu guidance.
Information
Please note that extended logging must be activated during the entire function test.
Please also note that extended logging is automatically deactivated after one hour. If
more than 1 hour is required for the function test, extended loggingmust be restarted
after one hour.
Assessment
( )
Hydraulic unit function OK
Action
Bleed the brake system and re-program
the PSM control unit.
Continue with Step 2.
(✗)
Hydraulic unit function not OK
Create PRMS ticket, attach extended
logging to the ticket and send it to Porsche
AG (PAG) via PCNA Technical Support.
PAG will check the extended logging and
then issue a repair recommendation.
Replacing the PSM control unit incl.
hydraulic unit without a corresponding
ticket feedback is not permitted.
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 ‘Campaign’
function in the additional menu on the PIWIS
Tester by entering a programming code.
Programming code:
G4A8Y
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Read and follow the information and
instructions on the PIWIS Tester during the
guided programming sequence.
Programming sequence:
Do not interrupt programming and coding.
A backup documentation process for the
re-programmed software releases starts after
the programming and coding is complete.
Programming time (approx.):
15 minutes
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
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 “Troubleshooting”'.
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
45305500
Replacing hydraulic unit
45302550
Programming hydraulic unit
Nov 19, 2024
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I No.
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211/23 ENU
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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.
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TSB/Document ID: No. 211-23-1
Replacement Service Bulletin Number:
MFR Communication Date: 2024-11-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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