No. 2309.1
Service Bulletin Details
Public Details for: No. 2309.1
Instructions on advanced technical information on the brake booster for the 718 gts 4.0
Models from 2021
2021 PORSCHE 718 BOXSTER GTS |
Bulletin #: 2309.1 Advanced Technical Information Part ID: 4777 4 718 GTS 4.0 - Brake Booster (Power Brake) Warning in Instrument Cluster Vehicles Affected Models Model Year Model Type VIN Range Vehicle-Specific Equipment 718 2021 - 2024 982160 982360 982370 n/a n/a Revision History Revision Release Date Changes 0 May 25, 2023 Original document 1 September 22, 2023 Update of MY, Condition, Technical Background & Service Information Condition Customer complains of a “Power brake error” or “Brake booster fault” warning in the instrument cluster upon starting the vehicle. These warnings may also be accompanied by a check engine light. The workshop finds fault code P055600 (DTC 0011OB) stored in the DME. If a check engine light is present, a corresponding fault code will appear in the Instrument Cluster control unit. P055600 fault descriptions include: Brake vacuum sensor - implausible signal Brake Booster Pressure Sensor Circuit Range/Performance Electric vacuum pump - power too low Technical Background The diagnostic function for checking the delivery rate of the electronic vacuum pump runs when Terminal 15 is activated after the vehicle has slept for 25 minutes or more. The value of the vacuum line pressure sensor (3 in Figure 1 below) upstream of the brake booster is stored immediately after Terminal 15 is activated. The value is recorded again after 1.5 seconds. Fault P055600 sets if the difference between the two values does not meet or exceed the threshold defined by the DME. AfterSales Sep 22, 2023 Page 1 of 4 Bulletin #: 2309.1 Advanced Technical Information Part ID: 4777 4 Although this fault is possible at any altitude, it is more likely to occur at higher altitudes due to the lower ambient pressure. This issue is currently under investigation by Porsche. Figure 1 Service Information 1. 2. Create a pre-VAL to document the occurrence of the fault. Check the following areas of the vacuum system for obvious leaks: a. Check the vacuum line connections at the pressure accumulators underneath the intake manifold (5 and 6 in Figure 2 below). NOTE: The intake manifold must be removed to completely check the pressure accumulators. => WM 244619 Removing and installing intake air-distributor Figure 2 AfterSales Sep 22, 2023 Page 2 of 4 Bulletin #: 2309.1 Advanced Technical Information b. Part ID: 4777 4 Check the vacuum line connections on the electric vacuum pump (2 in Figure 3 below). Figure 3 c. 3. 4. Check the vacuum line connection on the brake booster, as well as the function of the vacuum line pressure sensor in the PIWIS Tester (DME => Actual values/input signals=> A_General => A250_ Brake negative pressure absolute (measured) If no obvious leaks are found in the system checks in Step 2, replace the following components: - Figure 1: numbers 3, 4, and 5 - Figure 2: numbers 1-6 - Figure 3: numbers 1 and 2 If the fault further persists, please refer to Guided Fault Finding (DME P055600) for additional information. Please document all additional work performed AfterSales Sep 22, 2023 Page 3 of 4 4 Bulletin #: 2309.1 Advanced Technical Information Part ID: 4777 Warranty As always, please document the repair completely in PQIS. For this repair, please code the “cause” as follows: Cause location: 47770 Vacuum hose Cause symptom: 5021 Not airtight Use the following troubleshooting labor operations: 03350050 On board diagnostic 24461925 Intake distributor remove and reinstall 70081915 Trim panel for convertible top compartment remove and reinstall Additional labor operations may be claimed only as needed. Search Items 718, 982, GTS 4.0, Boxster, Cayman, P055600, DME, brake booster, power brake, vacuum pump, pressure sensor 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. F14204 ©2023 Porsche Cars North America, Inc. AfterSales Sep 22, 2023 Page 4 of 4