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HachiROM v0.10.2
Hitachi MMS ECU ROM Editor — Audi 5-cylinder 20v / V6
Download HachiROM-v0.10.2.exe and run — no install needed.
Supported ECUs
- 893 906 266D — 7A 2.3L 20v (late, 4-connector Hitachi)
- 893 906 266B — 7A 2.3L 20v (early, 2-connector Hitachi)
- 4A0 906 266 — AAH 2.6L 12v V6
Features
- 16×16 fuel and ignition map editors with heatmap visualization
- Full calibration table editing (warmup, IAT, MAF linearization, etc.)
- CO potentiometer disable patch
- Big MAF axis patch (7A)
- AAH V6 MAF axis patch
- Checksum correction (mod256, all supported variants)
- ROM diff / compare tool
- Save as 32KB or 64KB mirrored .bin
⚠ Work in progress — always back up your original ROM before editing.