OBD1 to FuelTech FT550 Adapter Harness – Logic Corrected | VTI

This is not a repin sheet solution. This is a complete, logic-corrected interface harness that provides a structured and clean transition from your factory OBD1 ECU system to a FuelTech FT550 standalone ECU — retaining factory engine harness integrity while enabling full standalone control, modern ignition support, and expansion capability.

Designed to minimize chassis modification while maximizing what the FT550 platform can do.

Configuration Overview

• OEM OBD1 ECU receptacles (P28 / P72 / P75 style)
• Genuine FT550 ECU connectors
• Fully corrected signal logic
• Integrated adapter loom
• Prewired T1 crank and cam inputs
• CANbus prewired
• Coil-on-plug DTM ignition connector
• Integrated 12-pin FuelTech-style breakout
• Built-in expansion breakout connectors

12-Pin Breakout Integration

A dedicated 12-pin FuelTech-style breakout connector is integrated for ignition 12V feed, 5V reference distribution, sensor power routing, expansion outputs, and auxiliary I/O allocation — eliminating loose pigtails and enabling structured system expansion.

Ignition & Engine Position Support

• T1 crank and cam sensor configuration prewired
• Coil-on-plug DTM output connector integrated
• Clean conversion path from distributor-based OBD1 to modern coil control

Designed for high-performance and boosted applications requiring reliable engine position referencing.

CANbus Integration

CAN wiring is pre-configured for dash integration, data logging, and FT550 peripheral support. No additional backbone wiring required for standard FT550 CAN deployment.

Intended Applications

• Turbo OBD1 Honda builds
• Distributor delete conversions
• Coil-on-plug upgrades
• Full standalone conversions
• High-output street and competition builds

Off-road / motorsport use only.