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In 1990, OBDI was still in use, not OBDII. OBDI did not have a standardized connector. You will probably need to activate the SCS mode of the PGM-FI and count flashes of LEDs on the PGM-FI module under the seat to get codes.

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16y ago
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Q: Where do you connect the OBD on a 1990 Honda Accord?
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