Celi Won't Start Code 51 Options

[djkurious]

Jumped in my celica and tried to start it and all I get is a clicking sound. All the accessories to come on, but no start. Immediately I thought it was the starter (which was replace 8 years ago), so I started tapping it with a hammer while a buddy was trying to start it. It still would not start. Also, I read the codes and it came back with a code 51. I took the starter off and took it for testing at Advance Auto and the starter was bad. Replaced it under warranty, re-installed it and it still would not start. The battery is good so I recharged it just to make sure it was putting out enough voltage. Tried to start again, still no start. It just keeps making the clicking sound. So now I read the codes again and it came back with a 51 from the ECM. I have read other posts and some members simply replace the starter and it was back running. Not the case here. Any suugestions?