No. 2311.1
Service Bulletin Details
Public Details for: No. 2311.1
Instructions on advanced technical information for dme fault P310B00 - fuel low pressure
Models from 2023
Models from 2022
Models from 2021
2021 PORSCHE 911 |
2021 PORSCHE 911 CARRERA |
2021 PORSCHE 911 CARRERA S |
2021 PORSCHE 911 GT3 |
2021 PORSCHE 911 TARGA 4 |
2021 PORSCHE 911 TURBO |
2021 PORSCHE 911 TURBO S |
Bulletin #: 2311.1 Advanced Technical Information Part ID: 2066 2 992 2WD – DME Fault P310B00 – ‘Fuel Low Pressure – Implausible’ Vehicles Affected Models Model Year Model Type VIN Range Vehicle-Specific Equipment 911 2021 - 2023 992110 (Carrera) 992120 (C2S) 992140 (C2GTS) 992150 (Carrera T) 992310 (Carrera Cab) 992320 (C2S Cab) 992340 (C2GTS Cab) 992810 (GT3) 992820 (GT3 Touring) n/a n/a Revision History Revision Release Date Changes 0 May 5, 2023 Original document 1 December 14, 2023 Update of Model Types, Technical Background, Service Information Condition Customer complains of a check-engine light resulting from fault “P310B00- Fuel low pressure – implausible” in the DME control unit. Technical Background The diagnostic responsible for this fault monitors supply deviation within a finite time between the demanded or target low-pressure requested of the low-pressure fuel pump and that of the actual supplied quantity to meet the request, as correlated to pressure. In some instances, manufacturing tolerances for the low-pressure pump result in the actual supplied fuel quantity exceeding the DME’s requested quantity, in other words, the pump’s operation is ‘too effective.’ By consulting the Vehicle Analysis Log (VAL) containing the fault it is possible to see if the supplied fuel quantity exceeded the requested quantity in the low-pressure system to cause the fault. AfterSales Dec 14, 2023 Page 1 of 3 Bulletin #: 2311.1 Advanced Technical Information Part ID: 2066 2 Figure 1 In the example provided below of Figure 2, with imperial units provided, it is apparent the excess low-pressure fuel supply caused the fault. Specifically, the value “B220_Fuel pressure actual value” of 10653.7 lbf/ft2 exceeds “B221_Fuel low pressure setpoint” of 10442.7 lbf/ft2. This deviation occurred despite the DME regulating the demand downwards (-) by 1948.6 lbf/ft² or 14.99% to compensate for the excess supply, but the regulation could not compensate enough to prevent the fault. Figure 2 - FC: P310B00 Environmental Data Values If the fault data is consistent with the condition exemplified in Figure 1, please replace the fuel pump, NOT the fuel pressure sensor. A software update to correct the diagnostic boundary parameters is available for GT3. AfterSales Dec 14, 2023 Page 2 of 3 2 Bulletin #: 2311.1 Advanced Technical Information Part ID: 2066 Service Information For Non-GT3 Models 1. Follow the instructions from Guided Fault Finding to rule out any other possible fault causes. 2. Referring to Figure 2. Identify measurement values for XX_Adaption value for low fuel pressure and A260_ Fuel pump control unit activation. 3. Follow WM 206619 – Removing and installing fuel pump to replace the fuel pump. 4. Verify the repair by monitoring the low-pressure fuel delivery under the engine operating parameters of the fault’s environmental data. For GT3 Models 1. Perform DME programming with PIWIS Tester version 42.400.020 or newer Target DME Porsche Part numbers from table below: Porsche Part Number DME SW Version GT3 ULEV MT 9GT.906.022.EA 0001 GT3 ULEV PDK 9GT.906.022.GQ 0001 Warranty As always, please document the repair completely in PQIS. For this repair, please code the “cause” as follows: Cause location: 2066 Fuel pump Cause symptom: 5062 Pressure too high Use the following troubleshooting labor operation: 20660175 Fuel pump check 20661950 Fuel pump remove and reinstall Search Items 992, 911, GT3, Fuel, Pressure, P310B00 – ‘Fuel low pressure – implausible’ 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. A15700 ©2023 Porsche Cars North America, Inc. AfterSales Dec 14, 2023 Page 3 of 3