We have created a list of the pinouts for the most popular B-series and D-series OBD1 ECU’s’ such as the P28, P30, P72 and P73. The pinouts¬†should work with other OBD1 ECU’s, but the wiring colours may vary. We hope this helps with your trouble/fault finding, or rewiring due to engine¬†conversion/swap or aftermarket ECU upgrade.

Honda, Civic, Integra, DelSol, Prelude OBD1 ECU pinout P28 P30 P72 P73 Type R CTR ITR wiring diagram

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