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Z27AG prior art: forfour Brabus is the CZT sibling
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz
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Mikkeli Matlock
2026-10-13 09:50:13 +09:00
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docs/impl/reports/Z27AG-CAN-PRIOR-ART.md
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@@ -42,8 +42,23 @@ Ralliart's 4G15T is also the forfour Brabus engine, and parts listings show the
sharing reaches the electrics (Z30 engine ECUs carry Mercedes-style `A135…` part sharing reaches the electrics (Z30 engine ECUs carry Mercedes-style `A135…` part
numbers; the steering rack is the 454's). The forfour notes bear that out for the numbers; the steering rack is the 454's). The forfour notes bear that out for the
body bus. Their layouts are the first hypothesis for every shared ID, and their body bus. Their layouts are the first hypothesis for every shared ID, and their
engine-side IDs a hint of what a petrol forfour or EU Colt would add. A forfour engine-side IDs a hint of what a petrol forfour or EU Colt would add.
1.5 Brabus or a CZT capture would be the true sibling; none is public. The smart
**The forfour Brabus is the sibling to look for.** EcuTek's [Colt CZT tuning
manual](https://ecutek.zendesk.com/hc/en-gb/article_attachments/204299089/Mitsubishi_Colt_CZT_-_Tuning.pdf)
(2005-on "CAN ECUs"): "The Smart ForFour Brabus edition is basically a Colt CZT
with the fibreglass body"; one ProECU package tunes both. Brabus owners run CZT
ECUs (MH8304F; ECUFlash definitions exist for CZT ROM 47110032 and Brabus
49100033, [EvolutionM](https://www.evolutionm.net/forums/ecu-flash/767782-xml-file-smart-brabus-w454.html)).
So a Brabus's engine-ECU frames should be ours (if the JDM Ralliart's ECU
matches the EU CZT's), while its body frames come from smart's SAM module: on the
454 "the SAM … sits at the awkward edge of Mitsubishi engine management and
Mercedes body electronics" ([smartcarmanuals](https://smartcarmanuals.com/models/454-forfour/)).
Expect, from a Brabus capture: engine frames equal, chassis frames (ABS, the shared
electric steering) probably equal, body frames different. No Brabus or CZT capture
is public; asking an owner for a minute of `candump` at the OBD port is the cheap way
to get one. The same manual notes that the **Euro CZT has no MAP sensor**, so OBD PID
`0B` may be unsupported on the Z27 (`obd-poller` discovers that by itself). The smart
fortwo 451 ([hackaday.io](https://hackaday.io/project/19931-smart-fortwo-can-bus-reverse-engineering)) fortwo 451 ([hackaday.io](https://hackaday.io/project/19931-smart-fortwo-can-bus-reverse-engineering))
shares `423` as the cluster status frame, little else. shares `423` as the cluster status frame, little else.