Transmission "Do Not Shift" Light and Code 22 (Speed Sensor)

[David Hanvy]

Hoorah for a happy ending; Thanks to all who responded. The problem
was finally found to be a bad connection on the connector plug going
to the speed sensor. It looked okay but ony worked after a liberal
spraying of contact cleaner and an application of connector
compound/grease. I did gleam the following info for anyone with an
Allison HTB 748 tranny. A correctly functioning speed sensor on this
tranny should read from 116 to 165 ohms (per Industrial Transmission)
when checked across the two leads. David Hanvy 89WB PT40 TX

--- In WanderlodgeForum@yahoogroups.com, "David Hanvy" <shanvy@...>
wrote:
>
> All, I'm sorry to report that my best efforts yielded no progress
> today. I'll sleep on it and if nothing else occurs to me to try,
I'll
> give Industrial Transmission a call on Monday. Hate to think what a
> pain it would be to have get the coach towed. It's inside a storage
> building and there is very lttle room to maneuver in and out of the
> facility in the base case. David Hanvy, 89WB PT40 Crosby, TX
>
> --- In WanderlodgeForum@yahoogroups.com, "Mike McMahan"
> <mmcmahan@> wrote:
> >
> > Howard, Industrial Transmission Ray Dobbs 254-776-4436 outside of
> > Waco, Tx I would reccomend them highly. Ray's brother Mike is
the
> > Stewart and Stevenson shop manager in Hewitt, Tx great team.
Mike
> > McMahan 1989 PT 40
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, "David Hanvy" <shanvy@>
> > wrote:
> > >
> > > Mike, Thanks for the input. I'll check the ignition switch
wiring
> > on
> > > both the front and rear remote. I would appreciate the contact
> > info re
> > > Industrial Transmission in anycase. The local Allison rep is
the
> > > Houston Stewart & Stevenson shop. I have spent more than a
> > reasonable
> > > amount of $$ with this outfit on other type repairs in the past.
> > > David Hanvy 89WB Crosby, TX
> > >
> > > --- In WanderlodgeForum@yahoogroups.com, "Mike McMahan"
> > > <mmcmahan@> wrote:
> > > >
> > > > David, I chased a do not shift light for months. mine would
> go
> > > out
> > > > when the coach was started and come on when the bus was shut
> > off.
> > > > Finally found loose wire on back of ignition switch. Low
> > voltage
> > > > and bad grounds do weird stuff to theses beasts. If you are
> > unable
> > > > to solve I'll get you the phone number for Industrial
> > Transmission
> > > > in Waco. They have the best Allison techs I have found and
are
> > > > usually willing to help you on the phone. Mike McMahan 1989
> > PT40
> > > >
> > > >
> > > > --- In WanderlodgeForum@yahoogroups.com, "David Hanvy"
> <shanvy@>
> > > > wrote:
> > > > >
> > > > > Leroy/Kevin,
> > > > > Thanks for your replies. I started the engine from the rear
> > > remote
> > > > > and the transmission warning light/do not shift remains on.
> No
> > > > change
> > > > > when I switched back to the front either. Additionally, I
> > > > > disconnected from shore power and disconnected the ground
> > cable
> > > on
> > > > > the battery bank in an effort to reset the tranny. No luck
on
> > > that
> > > > > either. (do not shift equals WILL not shift) I plan to to
> > locate
> > > > and
> > > > > read up on the Speed Sensor as a next step.
> > > > > All input is appreciated. David Hanvy 89WB PT40 Crosby, TX
> > > > >
> > > > > --- In WanderlodgeForum@yahoogroups.com, "Leroy Eckert"
> > > > > wrote:
> > > > > >
> > > > > > Although I don't think your bus would start if the remote
> > rear
> > > > > start switch was acting up, mine will give me a do not
shift
> > > light
> > > > in
> > > > > the rear start position and in the front position if it is
> not
> > > > > engaged properly. Not all coaches are wired to give a do
not
> > > shift
> > > > > light on the remote rear start position but mine does. I
have
> > > > never
> > > > > checked my codes so can't help there. I would cycle that
> > switch
> > > to
> > > > > rear, off, and back to front, restart and see what
happens..
> > It
> > > is
> > > > a
> > > > > long shot but easy to do.
> > > > > > Let us know what you find for future reference.
> > > > > > Leroy Eckert
> > > > > > 1990 WB-40"Smoke N Mirrors"
> > > > > > Niceville, FL
> > > > > > Royale Conversion
> > > > > > ----- Original Message -----
> > > > > > From: David Hanvy
> > > > > > To: WanderlodgeForum@yahoogroups.com
> > > > > > Sent: Thursday, September 13, 2007 8:48 PM
> > > > > > Subject: [WanderlodgeForum] Transmission "Do Not Shift"
> > Light
> > > > and
> > > > > Code 22 (Speed Sensor)
> > > > > >
> > > > > >
> > > > > > Greetings All; I started my coach today which has been
> > > sitting
> > > > in
> > > > > > covered storage with shore power for about two weeks.
The
> > > > > > transmission "Do Not Shift" light and check
transmission
> > > light
> > > > > are
> > > > > > staying on. It flashes a Code 22 which indicates a
Speed
> > > > Sensor
> > > > > issue.
> > > > > > Does anyone have any experience with this issue? I did
> not
> > > > note
> > > > > any
> > > > > > transmission problems on my last trip which was about
two
> > > > weeks
> > > > > ago. I
> > > > > > cleaned the ground strap connections on the
transmission
> > and
> > > > > frame and
> > > > > > checked the transmission cannon plug but the warning
> > lights
> > > > > remain on.
> > > > > > Thanks. David Hanvy 89WB PT40 Crosby, TX
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > [Non-text portions of this message have been removed]
> > > > > >
> > > > >
> > > >
> > >
> >
>