CEL when blue box/ecu is cold

[ECKSbloodECKS]

Im running a P72 with S200b in a 99 Integra GSR

Ive been getting a solid CEL when its cold outside. No red light in the blue box. I turn the heat on and after the interior heats up a bit, the CEL will go away, and red light is on in blue box.

Any ideas? Im thinking its a loose connection somewhere and when it heats up it expands alittle and makes enough contact, but wanted to see what you guys think.

Thanks.

[Hondata]

One of the solder joints is 'cold' (makes sense, right?) Using a soldering iron 'touch up' all the solder joints in the ECU for the socket and latch. Use heat and a little new solder to make sure all the joints are good.