No. 2221.3
Service Bulletin Details
Public Details for: No. 2221.3
Instructions on advanced technical information for the cayenne e-hybrid - thermal management fault (P26B100)
- 2023 - 2022 - 2021 - 2020 - 2019 -
Models from 2020
2020 PORSCHE CAYENNE E-HYBRID |
2020 PORSCHE CAYENNE TURBO S E-HYBRID |
2020 PORSCHE CAYENNE TURBO S HYB COUPE |
Bulletin #: 2221.3 Advanced Technical Information Part ID: 8274 8 Cayenne E-Hybrid – Thermal Management Fault P26B100 Causes Check Engine Light Vehicles Affected Models Model Year Model Type VIN Range Vehicle-Specific Equipment Cayenne As of 2019 up to 2023 9YAAE1 9YACH1 9YADE1 9YBAE1 9YBCH1 9YBDE1 N/A +0K3 Revision History Revision Release Date Changes 0 August 3, 2022 Original document 1 March 16, 2023 Update of MY, Technical Background, Service Information 2 April 27, 2023 Update of Service Information 3 November 15, 2023 Update of Service Information Condition The customer complains of a check engine light. The light may be continuous or intermittent. The workshop finds the fault P26B100 - Directional-control valve for high-temperature circuit (UVW3) – function implausible stored in the Thermal Management Control Unit (TME). Area of Occurrence (DME, Instrument Cluster, etc.) 82740 – Directional-control valve (changeover valve UVW3) AfterSales Nov 15, 2023 Page 1 of 3 8 Bulletin #: 2221.3 Advanced Technical Information Part ID: 8274 Technical Background The aforementioned fault code may be caused by a misdiagnosis of the directional control value for the high temperature circuit for interior heating (valve UVW3). Under certain operating conditions, a lack of temperature difference between the engine coolant circuit and the interior heating circuit may result in the TME diagnosing valve UVW3 as “stuck closed”, despite no mechanical fault in the valve. Figure 1 - Cayenne E-Hybrid Cooling Circuits Valve UVW3 controls the direction of coolant flow based on engine temperature. The valve defaults to closed, such that the high-temp circuit excludes the engine coolant circuit. During this “small-circuit” operation, the HV PTC controls the temperature of the high-temp circuit to meet the heating and air conditioning demands of the customer. Once the engine reaches 40° C, the valve opens (“large-circuit” operation) and the high-temp circuit uses the engine heat instead of the HV PTC. The status of UVW3 is diagnosed by the absolute value of the temperature difference between TW11 and TW12. The TME expects this difference to be larger than 7° C while the valve is closed, but smaller than 7° C while the valve is open. Certain operating conditions may cause the temperature difference to fall below 7° C while the valve is closed. If this condition exists while the TME is performing diagnostics, the valve will be diagnosed as open, although it is closed due to the engine temperature being less than 40° C. AfterSales Nov 15, 2023 Page 2 of 3 Bulletin #: 2221.3 Advanced Technical Information Part ID: 8274 8 Service Information 1. 2. 3. Please create a VAL to document the occurrence of the fault. Workshop Campaign WPR0 has been launched for MY20-23 as of November 15, 2023. Please complete this Campaign per the instructions in TI 177/23, if applicable, before performing any other diagnosis work for the subject fault code. If the fault persists after performing WPR0, please continue with other means of diagnosis. NOTE: As of the latest revision of this document, a software solution for MY19 vehicles is not yet available. A software update similar to WPR0 is expected for MY19 vehicles by February 2024. This document will be updated accordingly as more information is made available. Warranty As always, please document the repair completely in PCSS. For this repair, please code the “cause” as follows: Cause location: 82740 Directional-control valve Cause symptom: 1613 No function occasionally Use the following troubleshooting labor operation: 03350000 On board diagnostic Additional labor operations may be claimed only as needed. Search Items Cayenne, 9YA, 9YB, check engine light, TME, thermal management, P26B100, hybrid, E-Hybrid 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. K12472 ©2023 Porsche Cars North America, Inc. AfterSales Nov 15, 2023 Page 3 of 3