Series 60, DDEC 4, Check engine light

[David Brady]

Greg,

Do you think the turbo overspeed could have happened while
under jake brake. It all happened pretty fast, but I'm almost
certain that the condition occurred on a down hill section.
When using the jake, I can achieve 15 psi of turbo boost,
which is quite a bit lower than the 28 psi I get under full power.
I wonder if it's possible for the turbo to spin faster under
jake.

David Brady
'02 LXi, CO

David Brady wrote:
>
> It may mean high, or overspeed. The flash code associated
> with the message is 64 which my ddec 4 manual translates
> to "turbo overspeed".
>
> The "turbo speed sensor low" message was read from the
> J1939 port. I think the "low" portion of the message means
> voltage low, and low voltage in this case corresponds to turbo
> overspeed, which may be a problem. In high altitudes, the turbo
> can make up for thin air by spinning faster (to a degree). I don't
> think my turbo has a waste gate, so I'm not sure what would
> prevent it form overspeeding.
>
> I might be in love with the sound of the jake...
>
> David
>
> Gregory OConnor wrote:
> >
> > high would be a problem (Why use high and low and not fast and
> > slow??) low might mean an injector is pissing and the turbo is
> > spinning slow in relation to fuel??
> > Are you one of those guys in love with the sound of the Jake? they
> > make heat and stress.
> > the other thing is how does Ddec account for the thin air up
> > there, ???
> >
> > surf around on this site for forum threads on series 60 under
> > transportation trucks and busses
> > http://www.answerba g.com/ <http://www.answerbag.com/
> <http://www.answerbag.com/>>
> >
> > Greg
> >
> > --- In WanderlodgeForum@ yahoogroups. com
> > , David Brady
> > wrote:
> > >
> > > Folks,
> > >
> > > On my way up Vale Pass, near the Eisenhower Tunnel, my check
> > engine
> > > light came
> > > on and my DDEC displayed:
> > >
> > > PID 103, MID 128, FMI 1
> > >
> > > Which decodes to "turbo speed sensor low". I'll take it to the
> > local
> > > Detroit Service
> > > Center here in Denver, but in the meantime, does anyone have an
> > idea of
> > > what this
> > > could be?
> > >
> > > Thanks,
> > > David Brady
> > > '02 LXi, CO
> > >
> > >
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Checked by AVG.
Version: 7.5.524 / Virus Database: 270.6.21/1674 - Release Date: 9/16/2008 8:15
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