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If you are talking about the transmission control unit, it is behind the carpet in the passenger footwell.
Replace your AT Control Unit (Automatic Transmission Computer)
Under the carpet in the front passenger floor board.
The car doesn't want to shift properly.
Yes, with either a OEM Honda cruise control unit or aftermarket unit.
Bolted to the rear of the engine.
The fuel control cutoff unit, in your 1986 Honda Accord, is located on top of the fuel injector pump. The fuel control cutoff unit is contained in a sealed box.
It is flashing because the automatic transmission control unit has detected a problem. Seek professional help immediately.
Problem with the transmission ECU. Don't confuse Engine Control Unit (ECU),with the Transmission Control Unit (TCU).The TCU is under the carpet of the passenger seat.Available on Ebay for less than 150.00
under the drivers seat.
It is underneath the carpet on the passenger side behind a metal plate. Peel back the carpet, undo four nuts and carefully pull the metal plate back. The transmission control unit is bolted to the back of the plate.
Is it PGM-FI? If so, look under the driver's seat.