2004 f250 ECM voltage question
 

I am getting lower voltage readings at teh ecm compaired to the batteries. Is this normal??

Low batterys = 10.5 volts at battery / 9 volts at ecm

charged overnight batteries = 13 volts / 10 .2 at ecm

Is this normal?? Troubleshooting a no start, realized no power to fuel pump, or even the inertia switch for that matter and reference voltage for sensors is showing .1 volts. I dont have a high end code reader, just a bluetooth one. no codes from that. Im still trying to find a detailed wire color diagram for this truck. I have the coffee table bible one ,but it does not show wire colors.

Any ideas or experiences??

Thanks for the help :)

How are you reading voltage at the ECM???

Voltage at ecm
 

Well since i cannot get the bluetooth reader to talk. i unplugged the center connector on ecm and used a volt meter on the second pin from the top right as a reference. (it was the only pin that had more than 1.5 volts on it :) I could not find a pinout / wiring diagram for the ecm.

Woot :0 I found a chaffed wire in the bundle behind the fuse box!!! truck now talks to ecm and getting fuel :) still no start but we are closer !!!:jump: