how to reset ecu
 

Ok I can't figure out how to reset my pr4 ecu in my 90 crx si with b18b1. I fixed my codes and they are stored on the ecu and I want to reset it to see what codes come back to see if I did something wrong can anyone tell me how to reset the ecu I pulled the neg battery terminal pulled the hazard fuse and the ecu fuse and it didn't reset

Re: how to reset ecu
 

I kno of 2 way eaither pull the positive battery cable off or pull out the ecu fuse under the hood. Edit try keeping the the ecu fuse out for atleast 30 sec or keep the positive cable of the battery for 30 sec

Re: how to reset ecu
 

An OBD0 ecu WILL reset by simply disconnecting battery power. If the codes are returning immediately after, then you haven't fixed the problem...

Re: how to reset ecu
 

^this just unplug your pos. battery terminal and turn your headlights for a few seconds then plug it back up