The 1-wire VTEC codebase is a specialized ROM modification for OBD0 MPFI ECUs. It repurposes the Automatic Transmission Lockup Solenoid0 output to control VTEC engagement, enabling VTEC functionality on early OBD0 engine control systems.

Overview#

This modification is designed for users operating OBD0 MPFI ECUs who wish to run VTEC-equipped engines. By utilizing the existing wiring and output intended for the automatic transmission lockup solenoid, it simplifies the wiring requirements for VTEC activation.

Development and Implementation#

• Hardware: The necessary hardware changes for this modification are detailed in the Hardware For One Wire VTEC0 guide.
• Source Code: The project is open-source. Codebase contributions and development can be found via the Source Forge0 project repository.

Important Considerations#

• Testing: This conversion is functional, but thorough testing is required when implementing custom code modules.
• Wiring: This modification requires specific ECU hardware changes and engine harness modifications to repurpose the lockup solenoid output. Ensure all connections are secure and verified against your specific ECU board layout.