OBD1 Auto ECU / TCU Harness for 1992-1995 Honda Civic B-Series Automatic Swap

Keep the Automatic. Swap to B-Series. Gain OBD1 Tuning Capability.

This OBD1 automatic ECU / TCU adapter harness is designed for 1992-1995 Honda Civic models originally equipped with an automatic transmission when performing a B-Series engine and automatic transmission swap.

The factory Civic automatic ECU controls both the engine and transmission, but it cannot properly control a B-Series automatic transmission. This harness allows the use of a compatible OBD1 automatic ECU with a separate automatic transmission control unit (TCU).

Vehicle Fitment

1992-1995 Honda Civic – B-Series Engine & Automatic Transmission Swap

Features

• Designed specifically for B-Series automatic swaps
• Allows separate OBD1 ECU and TCU operation
• Retains automatic transmission functionality
• Allows compatible OBD1 ECU tuning setups
• OEM-style connectors and pins
• OE-quality fitment and reliability

Required ECU / TCU Setup

This harness must be used with:

• Compatible OBD1 automatic ECU package or
• 1994-1995 Acura Integra automatic ECU 37820-P75-A51
• Separate OBD1 P78 automatic TCU or equivalent

Important Fitment Notice

• For automatic B-Series engine and transmission swaps only
• Will NOT work with D-Series automatic transmissions
• Requires a separate compatible automatic transmission control unit
• Will not work with unsupported ECU or tuning configurations

Please make sure this harness will fit your specific vehicle, engine, transmission, ECU, and TCU configuration before purchasing.

Professional Installation & Tuning Available

RPM Racing offers professional automotive wiring, ECU installation, engine-swap support, and tuning services.

Contact RPM Racing for installation, tuning availability, pricing, and scheduling.

B-Series power. Automatic transmission. The right wiring to bring it all together.