02 Peterbilt 379 won't start.

Cam poison sensor or fuel pressure regulator. Is only other things I cam wrap mind brain with.

 

Thing is it ran great till the battery change, also won't communicate. As a good rule if it was fine and was worked on them not fine that's the place to go. I will agree that cam sensors will fail without warning or code, but it would still communicate. Same as if fuel pump had an event.

 

I'm no ASE tech, but when I read this I question a few things that may seem irrelevant... You say pin 70 of ecm has power, but are you also checking using the ground within that clip, or body chassis ground? Does your check engine light; light when you first turn on the ignition switch (meaning there is power to the ecm)? I wonder if one of the batteries was ever bad or just a symptom.

 

there should be a key one fuse

 

key on fuse

 

three hots with key on

 

Simple question.

When you turn the key on do your check and stop engine lights light up?? They should light up for 2-3 sec then go out. If they don't then who ever installed your battery's probley hooked up the wrong cabels and fried your ecm.

 

If your check and stop lights are doing there thing then I'd look at the fuel side.