NO BUS diagnostic
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Amateur
Joined: Nov 2017
Posts: 44
Likes: 1
From: Oregon
NO BUS diagnostic
Hey friends, does anyone have a solid step-by-step method of diagnosing a "no bus" code?
In my particular case (2000 5.9L) the ASD relay is buzzing and if I remove it, my fuel pump relay buzzes.
I'm getting full voltage on my 5v reference circuit at my TPS but I'm finding around 2.5 V on my injectors' 12v power feed.
Fuel pump doesn't prime but the starter works when I attempt to start.
I have the electrical diagram and am preparing to go to work, but just wondering if anyone has a good trick on where to begin and move forward.
Thanks!
In my particular case (2000 5.9L) the ASD relay is buzzing and if I remove it, my fuel pump relay buzzes.
I'm getting full voltage on my 5v reference circuit at my TPS but I'm finding around 2.5 V on my injectors' 12v power feed.
Fuel pump doesn't prime but the starter works when I attempt to start.
I have the electrical diagram and am preparing to go to work, but just wondering if anyone has a good trick on where to begin and move forward.
Thanks!
Legend
Joined: Nov 2014
Posts: 8,098
Likes: 318
Hey friends, does anyone have a solid step-by-step method of diagnosing a "no bus" code?
In my particular case (2000 5.9L) the ASD relay is buzzing and if I remove it, my fuel pump relay buzzes.
I'm getting full voltage on my 5v reference circuit at my TPS but I'm finding around 2.5 V on my injectors' 12v power feed.
Fuel pump doesn't prime but the starter works when I attempt to start.
I have the electrical diagram and am preparing to go to work, but just wondering if anyone has a good trick on where to begin and move forward.
Thanks!
In my particular case (2000 5.9L) the ASD relay is buzzing and if I remove it, my fuel pump relay buzzes.
I'm getting full voltage on my 5v reference circuit at my TPS but I'm finding around 2.5 V on my injectors' 12v power feed.
Fuel pump doesn't prime but the starter works when I attempt to start.
I have the electrical diagram and am preparing to go to work, but just wondering if anyone has a good trick on where to begin and move forward.
Thanks!
