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?

[cv7713]

i'm not sure if the code and the starting problem are related. a code 51 is for A/C switch signal.

A/C Switch Circuit
A/C Swith
A/C Amplifier
Throttle Position Sensor Circuit
Throttle Position Sensor
ECM

did you test the alternator?

is it turning over, just not firing? or is it not turning over at all? make sure the starter is wired correctly also.