No Bus

[MuddFlapp]

This morning I have a "no bus" message in the odometer window and of course, the engine won't start.
The last thing I did was replace the compressor and solenoid for the exhaust brake but everything was working fine yesterday when I shut it off then this morning I got the error and nothing works. I disconnected the batteries to try a "reset" but no go. I have them disconnected now for a longer "reset" but I have little faith.

Any suggestions?

Thanks

 

[Topzide]

Where is the solenoid for the EB? Might you have loosened a connector that after driving yesterday has come enough apart to cause error? Check the ECM connector or any near where you were working.

 

[MuddFlapp]

Where is the solenoid for the EB? Might you have loosened a connector that after driving yesterday has come enough apart to cause error? Check the ECM connector or any near where you were working.

I don't think so, it's been running for a week or so. I have disconnected
the EB from all power. Is there a way to reset the TIPM?

 

[Topzide]

I'm sure there is a way. Do you have access to AlfaOBD? There might be a way to do with it.

 

[MuddFlapp]

The problem is I don't know what an ECM connector is nor an AlfaOBD.

 

[Topzide]

ECM is the computer brains that your truck uses and AlfaOBD is a software that provide diagnostics for truck. When working on a truck with some age, wiring issues become more of an issue. It could be a connector that got moved and loosened or could be grounds that have failed and need to be repaired. Wiring issues will make you pull your hair out!
Another thing could be that you may need to have the cluster repaired. They've been known to have bad solder connections on them. A quick search on the forum for "cluster issue" brought up a lot of 3rd gen problems. Gremlins in these truck can be fun to trace. Good luck.

 

[MuddFlapp]

Thanks for the help, I think. So the ECM is the square plate that is bolted to the block? And the wires from it lead to sensors? And any of them may have an issue.

 

[Ozymandias]

Yes, it can be as simple as a loose ground, rotten battery connectors or just a bad battery - but at the same time I can be a slightly corroded pin somewhere within the 10 mile wiring harness and you'll never find it, creating more problems along the way to try to find it.
Or one of the ten+ modules within the BUS system has shorted out and pulls the BUS down.
There is a troubleshooting tree in the FSM that a technican has to follow step by step to find out what is wrong.

I'm not sure you should tackle this problem by your self.
Done wrong you could mess up even bigger here.
There is a reason for it why a diagnostic technician needs an extensive training and makes big money afterwards.

That's what I read from what you write.
Sorry

 

[MuddFlapp]

I have decided that the best thing for me to do is hire a rollback and deliver my truck to the dealer for analysis. Maybe I'll get lucky and they can find it in short order. At any rate, this is beyond my realm of expertise.

Thanks for all the help.