Haz Posted Monday at 02:58 PM Report Share Posted Monday at 02:58 PM SSM 53638 - 2023-2025 Various Vehicles - Trusted Real-Time Operation Network (TRON) Module Authentication DTCs After Module Replacement - Workshop Manual Update After replacement of any TRON module, the gateway module (GWM) and the TRON capable modules can set diagnostic trouble codes (DTCs) U211A, U211B, U211C, U3034, U3035, U3036, U35D9, U35DA and/or U35DB if the secret authentication security keys are not aligned between the modules, a loss of communication is occurring between modules and/or a module is not responding. This may be a result of missing the new module secret authentication security key obtained when running the Ford Diagnosis and Repair System (FDRS) "Trusted Real-Time Operation Network (TRON) Module Authentication" procedure after replacement. When replacing a TRON capable module, run the FDRS "Trusted Real-Time Operation Network (TRON) Module Authentication" procedure to distribute a new set of secret authentication security keys to all TRON-capable modules. Using the specific VIN, refer to Workshop Manual (WSM), Section 418-00 and 418-01 for updated DTCs, applicable TRON module listings and pinpoint tests. From the 2024-2025 Nautilus Workshop Manual... Placing your device cursor over underlined acronyms may yield popup full-words descriptions of the acronyms. Trusted Real-Time Operation Network (TRON) - System Operation and Component Description System Operation Overview Trusted Real-Time Operation Network (TRON) is a cyber security protocol applied to certain modules connected to the vehicle communication networks. This protocol provides a digital message authentication for data being communicated between modules on the networks, to make sure the data received by a module is the data sent by the sending module and has not been interrupted or tampered with by an outside source. System Diagram Trusted Real-Time Operation Network (TRON) Trusted Real-Time Operation Network (TRON) secret data authentication security keys are applied to modules with motion control, safety critical and security critical functions. Not all modules on the vehicle will have data authentication security keys applied. The secret authentication security keys provide a digital data handshake between the sending module and the receiving module to confirm the data received has been sent by the expected source. The initial secret authentication security key distribution takes place at the end of the production line, prior to the vehicle release to the dealer. The key update mechanism includes a key management client and key management server modules. The key management client is the GWM and the key management server modules are the modules participating in the TRON function. The GWM generates the keys and distributes them to itself and the server modules, one module at a time sequentially. The keys are processed by the receiving modules and stored in their memory and a backup of the distributed keys is stored in the TCU . After the vehicle's TRON has been successfully configured, the production line end of line tool sends a copy to the Ford backend data systems for storage. If a TRON-capable module is replaced, the module secret authentication security key must be applied to the new module so it functions on the network when installed. When replacing a TRON capable module, run the FDRS Trusted Real-Time Operation Network (TRON) Module Authentication Diagnosis and Repair procedure to distribute a new set of secret authentication security keys to all TRON-capable modules. The GWM and the TRON capable modules can set Diagnostic Trouble Codes (DTCs) if the keys are misaligned between modules, there are communication issues on the vehicle network or a module is not responding. Component Description Gateway Module The GWM acts as the key management client for the Trusted Real-Time Operation Network (TRON) system for creating, monitoring and distributing the secret keys to the participating modules. Telematic Control Unit Module The TCU stores a backup of all Trusted Real-Time Operation Network (TRON) distributed keys. 1 Quote Link to comment Share on other sites More sharing options...
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