Need cat adem 4 ecm diagrams - MHH AUTO - Page 1 Apr 23, 2016163. Joined: Oct 2011. 1 04-23-2016, 05:16 PM. Hi All, I am in need of caterpillar adem 4,70 pin ecm circuit diagrames.I looked on sis can not found anything there, please held me with the cem circuit board diagrams I have one ecm apart which does not communicate. Thanks.