Just got this code on our port and center engines (Merc racing 700's). Can't find what it means on google. Both those engines were running considerably low water temperature ~115 degree vs strbd at 170 degrees. Oil temps were all same.

These two links should get you headed in the right direction. Good luck.

http://www.justanswer.com/boat/760yk...-hours-it.html

http://boatinfo.no/lib/mercruiser/ma...s/page_l65.swf

Using Merc CDS diagnostic tool your code will show Sea Pump Pressure Circuit High - in which is the same as your Smartcraft " BLK PSI CKT HI " code. This code will still allow the engine to have 90 % power as the engine could go into 10 % guardian mode. The common fix for your code is block pressure sensor circuit shorted. Its either a wiring / connection problem or the sensor itself problem or both.

Oh now I see the poster above already showed you the problem as I just clicked on his links anyways either info should help you. My bad.