Security Access (0x27) is a fundamental mechanism within the UDS protocol that controls access to critical ECU functions such as reprogramming, coding, fault clearing, and the activation of special...
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Posts made by Alex.c
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Interpretation and Response of CAN Frames for Reading Diagnostic Trouble Codes (DTC) and Associated Data in Toyota/Scionposted in General Vehicle Network Discussion
In automotive diagnostics over the CAN network, especially in Toyota/Scion vehicles such as the FR-S, reading Diagnostic Trouble Codes (DTCs) is not limited to a single request from the scanner, bu...
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Analysis of the Diagnostic Index in BMW modules using UDS and its interpretationposted in General Vehicle Network Discussion
In advanced diagnostics of vehicles such as the BMW X5 E70, one of the most important aspects is the correct identification and interpretation of the Diagnostic Index (DI) within UDS communication ...
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Analysis of the Diagnostic Index in BMW modules using UDS and its interpretationposted in General Vehicle Network Discussion
In advanced diagnostics of vehicles such as the BMW X5 E70, one of the most important aspects is the correct identification and interpretation of the Diagnostic Index (DI) within UDS communication ...
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Interpretation of Multiframe Responses in Automotive Diagnostics via CAN Bus (Read DTC)posted in General Vehicle Network Discussion
In vehicle diagnostics using the UDS protocol, when requesting fault codes through service 0x19 (for example, a request like 03 19 02 AF, which means “read DTCs by status mask”), the EC...
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UDS pre-diagnostic unlocking mechanisms in MINI/BMW vehicles using proprietary CAN framesposted in General Vehicle Network Discussion
In vehicles such as the 2012 MINI Cooper, it has been observed that access to diagnostics is not enabled directly through UDS; instead, there is a prior mechanism at the CAN network level where the...
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Analysis and Interpretation of UDS (0x31) Frames in the LIN Module of Mitsubishi for DTC Reading via ISO-TPposted in General Vehicle Network Discussion
I am currently performing reverse engineering on a Mitsubishi vehicle, and while analyzing the module referred to as LIN, it is observed that when requesting fault code reading, the scanner sends a...
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Interpretation of DTC frames in GM/Cadillac vehicles using GMLAN over CANposted in CAN Bus | Reverse Engineering & ECU Security
I am currently working on the emulation of a 2019 Cadillac ATS, and when I try to enter the DTC display function from the scanner, I receive the request 03 A9 81 1A 00 00 00 00. By analyzing the pr...
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UDS Protocol and CAN Frame Interpretation in Automotive Diagnosticsposted in General Vehicle Network Discussion
The UDS (Unified Diagnostic Services) protocol is a diagnostic standard used in modern vehicles that enables communication between diagnostic tools and electronic control units (ECUs) through the C...
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Differences between CAN Broadcast and Request communication in automotive systemsposted in General Vehicle Network Discussion
CAN (Controller Area Network) communication mainly operates in two modes: Broadcast and Request/Response, which differ in how data is transmitted within a vehicle. In Broadcast mode, modules send i...
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Interpretation of CAN frames in Audi vehicles with 29-bit identifiers (extended CAN) vs standard 11-bit CANposted in General Vehicle Network Discussion
I’m working with CAN communication in an Audi vehicle and I have a question regarding the use of 29-bit identifiers (extended CAN), since I previously worked with 11-bit CAN where, when respo...
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GM/GMC – CAN Response ID Offset for Module Accessposted in General Vehicle Network Discussion
I am working on a reverse engineering project involving ECU emulation and CAN diagnostic communication on a GMC vehicle (GM/GMLAN architecture), and I have noticed something interesting regarding m...
