CORE Detroit Diesel DDEC-IV, ECM R23519310 MTA # 178223R Series 60 S60 Bus Posted on August 6, 2024 by admin Nothing to send back. Detroit Diesel DDEC-IV, ECM. R23519310 MTA # 178223R. Actual ECM is pictured. Please enlarge the pictures. I do not know the history of this part.