Swaped a b20 into my automatic 01 Integra. Added a 2000 crv ecu. Started throwing a p0740 code. Put a different 01 Integra tranny in and its throwing the same code. Any ideas? Thanks for any and all help!

 

So I guess the CRV ECU doesn't like the Integra transmission? That code is for the torque converter lock up solenoid? Why are you running the CRV ecu? I have read that the integra ECU will run the b20 fine when it is equipped with the orginal b18 intake/exhaust manifold, throttle body and all emissions equipment etc (and great with a piggyback ecu).... If I were you, I would either run the stock integra ecu plus a piggy back tuner like an apexi SAFC or splurge and get a https://www.hamotorsports.com/neptun...vtec-auto.html , transmission ecu and harness....

Also maybe you could get lucky and just swap a crv solenoid onto your integra transmission?