Jake Brake Problem

[Johnny M Slone]

I do not think it would be the throttle position sensor because the
trans down shifts. Is my thinking correct on that.

Would a Pro Link be able to help me pinpoint the trouble. Does the
trans and the DDEC share the same test point for the Pro Link. I only
know of one plug which is by the drivers left knee.

I'm finding that my old 84 PT35 systems was more on my level!

Johnny M Slone
Pikeville, Ky
98 LXI

[Larry Kehler]

On my 94 the DDEC power wires are two sets of two wires that go
directly from the DDEC plugs on the street side to the engine center
battery. This was the problem I had this last spring when my engine
would start but not run. It turned out one wire set needed cleaning.
Each set fired one bank, so only one bank of injectors were firing.
The wire sets have inline fuses about a foot from the battery.

Larry Kehler
94 PT40 "BAM"
St Louis

--- In WanderlodgeForum@yahoogroups.com, Leroy Eckert
wrote:
>
> Don't know Greg. I know they are in the engine compartment but have
never tracked them down..I have several auto reset breakers back
there. I also know my Royale is different than others. Maybe those
Prevost converters knew something.?????
> Leroy Eckert
> 1990 WB-40 Smoke N Mirrors
> Royale Conversion
>

[Gregory OConnor]

tPS and rpm I dont believe make the jake (engine brake) inoperitive.
I think the switch at the pedal sends the signal (you can run the
Engine brake with idle turned up) If some rug lint gets on the pedal
switch or a floor mat gets atop the pedal, the pedal input to the
computer is that the driver wants to propell so it shuts down the
jake. On our '04 C15/Cat hydroseeder you some times have to pounce
down on the pedal and back up to return the pedal to sound the
jake. I also had some problem with a material trailer the seeders
pull not allowing the jake to run???? I think the brake lights or
wire held the issue, is the problem while you pull a toad???

Have you ever done a check on the diaphram for the emergancy
brakes. Pressurize the tanks ;Shut down the engine; chock the
tires ;release the parking brake. I had an old Benz Cabover with an
exhaust brake that failed because there was a switch on the
parkbrake and the brake was liftet slightly?????

--- In WanderlodgeForum@yahoogroups.com, "Johnny M Slone"
wrote:
>
> I do not think it would be the throttle position sensor because
the
> trans down shifts. Is my thinking correct on that.
>
> Would a Pro Link be able to help me pinpoint the trouble. Does
the
> trans and the DDEC share the same test point for the Pro Link. I
only
> know of one plug which is by the drivers left knee.
>
> I'm finding that my old 84 PT35 systems was more on my level!
>
> Johnny M Slone
> Pikeville, Ky
> 98 LXI
>

[Gregory OConnor]

Larry, that is interesting. I wonder if your computer power was
modified. my prints show the three fuse/breakers behind the bumper.
Is there three fuses behind the bumper on your bus??? I had recent
computer problems on a class8 truck with a Cummins N14 and there
were two fueses that the tech checked at one of the mid batteries.
I wonder if engine mfg's spec they use a mid battery because the
power is not as interrupted by the starter and alts from this
location???? maybe BB set it up wrong with powering the computer
from a stud between starter and batts and some prior tech picked up
on it.
Greg

--- In WanderlodgeForum@yahoogroups.com, "Larry Kehler"
wrote:
>
> On my 94 the DDEC power wires are two sets of two wires that go
> directly from the DDEC plugs on the street side to the engine
center
> battery. This was the problem I had this last spring when my
engine
> would start but not run. It turned out one wire set needed
cleaning.
> Each set fired one bank, so only one bank of injectors were firing.
> The wire sets have inline fuses about a foot from the battery.
>
> Larry Kehler
> 94 PT40 "BAM"
> St Louis
>
> --- In WanderlodgeForum@yahoogroups.com, Leroy Eckert

> wrote:
> >
> > Don't know Greg. I know they are in the engine compartment but
have
> never tracked them down..I have several auto reset breakers back
> there. I also know my Royale is different than others. Maybe those
> Prevost converters knew something.?????
> > Leroy Eckert
> > 1990 WB-40 Smoke N Mirrors
> > Royale Conversion
> >
>