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im a new member and sorry for my english im from greece, i have a ej9 civic 96 with a d14a4 engine auto tranmission that has broken down. I have changed the engine and put on a used d14a3 with manual tranmission
I put myself every necessary mechanic part needed but i didnt replace the control unit
and i did not remove the cables of the auto gear
*I think there is a problem with the ECU. Does anybody know if it needs to be changed?

 
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Yes you have to change the Ecu to a manual computer. or go get a tune done.

 
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what are you mean tune done? my engine light is on and the error is 19Automatic transmission lockup control valve can i do something ,i do all the work alone it cost less than 350$ engine gearbox shift **** all and chance the pedals all the cables fit perfect at the new engine but the reverce light cable is finish at ecu beacuse is the cable of solenoid , i check solenoid for tune but i stack thats all i wish to understad, im from greece you remember , thanks alot for reply.