Author: John Martin
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ECU Diagnostics – part 13.1 : MBE-Broadcast
Documents the MBE-Broadcast protocol, where the Caterham ECU continuously emits CAN bus frames containing diagnostic data once the ignition is on.
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ECU Diagnostics – part 13 : Three Diagnostic Protocols in the MBE 9A4 ECU
Introduces the three diagnostic protocols found on the Caterham MBE 9A4 ECU: MBE-Broadcast, OBD-II, and the MBE ISO-TP protocol used by Easimap.
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ECU Diagnostics – part 12 : OSI 7 Layers for Caterham Diagnostics
Maps the Caterham diagnostics stack onto the OSI model, from CAN bus hardware through MBE ISO-TP layers up to Python tooling and applications.
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ECU Diagnostics – part 11 : Logic Analyzer on the CAN Bus
Uses a Saleae logic analyser on the CAN bus to validate Caterham MBE ECU diagnostic code and compare captured traffic with expected requests and responses.
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ECU Diagnostics – part 10 : Decoding EC2 Files
Starts decoding Easimap EC2 files so Caterham MBE ECU CAN bus responses can be translated into useful human-readable diagnostic values.
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ECU Diagnostics – part 9 : The Easimap Protocol Theory
Develops a theory for the Easimap request and response protocol by analysing Caterham MBE ECU messages captured from the CAN bus.
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ECU Diagnostics – part 8 : Easimap uses ISOTP (sort of)
Examines Easimap CAN bus traffic and identifies ISO-TP-like message framing in the way the software talks to the Caterham MBE ECU.
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ECU Diagnostics – part 7 : ECU Maps and Mapping
Explains ECU maps and lookup tables, using Caterham MBE engine management as the context for how sensor data becomes control output.
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ECU Diagnostics – part 6 : Reading Material
Notes how The Car Hacker’s Handbook helped frame the Caterham ECU diagnostics work, especially CAN bus, ISO-TP, UDS, and request-response protocol ideas.
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ECU Diagnostics – part 5 : The Correlator Dead-end
Records an abandoned attempt to correlate Easimap data with CAN bus captures while reverse-engineering the Caterham MBE ECU protocol.