I have a 92 civic with b16b motor in it.the problem am having is that when I turn on the engine the check light comes on.what can a posible problem for that?

Check for codes, by jumping the Service Check Connector. However, if the CEL stays on, when the ignition switch is turned to ON (Position II) and the engine doesn't start, then the ECM is likely bad and needs to be replaced. Get an exact Honda Part No. match, in this case.