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Honda OBD1 (1992-1995) Standalone ECU Wiring & Plug-and-Play Adapter Pinouts

Pinout maps and hardware setup for OBD1 Civic/Integra (P28/P30/P72) factory harnesses: A/B/D connectors, VR sensor inputs, and standalone board assembly.

Intermediate 0

Adapted from Honda OBD1 PnP (by AndreyB) , Honda OBD1 Setup (by blundar)

VIRUXE (@viruxe) Contributor

Overview

1992-1995 Honda OBD1 vehicles (EG Civic, DC2 Integra, CB7 Accord) use a 3-plug ECU interface (Connectors A, B, and D). This reference covers wiring standalone ECUs directly to factory OBD1 Honda harness plugs.

1. Primary Connector Pinouts (Plugs A, B, D)

Connector A (26-Pin Main Connector)

Pin Function Sensor / Actuator
A1 Fuel Pump Relay Ground Main Relay Pin 7
A7 FLR Output Fuel Injector #1
A8 FLR Output Fuel Injector #2
A3 FLR Output Fuel Injector #3
A5 FLR Output Fuel Injector #4
A25 Power Ground Engine Ground Stud

2. Plug-and-Play ECU Board Assembly

Frankenso 0.4 Honda OBD1 plug-and-play adapter board header assembly.
Frankenso 0.4 Honda OBD1 adapter board overview showing header pin soldering.
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Applies to

13 taxonomy links
Cars 10 links

Acura

2 links

Honda

8 links
Model Prelude
Direct taxonomy match
Engines 3 links

Honda Engines

3 links
Engine Family B-series
Direct taxonomy match
Engine Family D-series
Direct taxonomy match
Engine Family H-series
Direct taxonomy match

Credits and source

Source Adapted from Honda OBD1 PnP on rusEFI forum.

Source Adapted from Honda OBD1 Setup on rusEFI forum.