OBD1 Honda ECUs (92-95) share a standardized hardware platform, allowing for significant flexibility when running custom codebases. However, specific hardware-to-software requirements must be met for stable operation.

Compatibility Rules#

• VTEC Support: VTEC-enabled ROMs require a VTEC-capable ECU. If using a non-VTEC ECU, you must perform a Non-VTEC to VTEC conversion0 or use a ROM with VTEC disabled.
• Non-VTEC ROMs: These can run in VTEC-capable ECUs without modification.
• O2 Sensor Compatibility: 1-wire O2 ECUs (e.g., P05, P08) require either a hardware conversion2 or for the O2 Heater Circuit check to be disabled in the ROM.
• Knock Sensor: DOHC VTEC programs (e.g., P30, P72) require a knock sensor circuit. If using an ECU lacking a knock board (e.g., P28, P08), you must disable the knock sensor check in the ROM.

Regional ECU Differences#

Different regional ECUs lack specific components that must be either physically added or disabled within the ROM:

Technical Note#

For detailed instructions on disabling specific sensor checks (Knock Sensor, O2 Heater, etc.) within your ROM, consult the specific ROM Map0 for your ECU codebase.