Scan Tool won't communicate with ecu

[parker1825]

My MAC OBDII scan tool will not communicate with the ecu in my 09Ram1500 5.7. From what I
can establish in various forums is that it may not be getting power through the connection. Can
someone tell me which pin(s) are power and ground?

Thanks.

 

[WY-Dave]

http://connectors.dcctools.com/home.htm

 

[Tach_tech]

Which ECU are you trying to communicate with. ECU-Electronic Control Unit is just a generic term. I’m assuming your trying to communicate with the PCM?

Do you have the key in the run position? If you start checking pins at the DLC for power/ground, make sure you also have about 2.5V on the Can C- and Can C+. The Can C pins are the actual communication circuits. So if there’s nothing there you won’t have any communication.