At 07:13 PM 7/15/04, you wrote:
> Could putting another interrupt switch in the lockup circuit be
>an option? (I don't recall if there is an electrical solenoid that
>controls lockup or what.)
I haven't looked into that area in detail as yet. I did come across
in the FSM that there is an electronic transmission relay which
powers the OD solenoid, the TCC solenoid and the governor
pressure solenoid with all three solenoids molded together.
Not too sure if all three molded together means all three
are put in one unit.
> When the truck shifts into OD during a run (and you don't want
>it to) does the "OD OFF" light go out or remain on?
The OD lamp goes off, which would indicate to me that somehow
another pulse signal (just as if someone had used the OD switch)
has been sent to the pcm.
I've taken the OD switch out and blown compressed air into the
end of the shift lever and also the switch itself. I've also sprayed
some electric contact cleaner into both.
The wire to the switch is physically open in that each end is attached
to a separated female connector within the end of the shift lever. The
OD pushbutton switch itself has two prongs which plug into the two
connectors. When the button is pushed and released, the circuit
is momentarily closed (on the push) and a pulse signal is sent to the pcm.
For the sake of trying to put it in layman's terms, as pulse signals are sent,
the pcm will interpret them as OD OFF and then OD ON, etc.
From a physical standpoint, I can only think of two ways that an unattended
pulse signal can be sent. One ... the inside of the push button stays very
close to the contacts of the two prongs when it is released and somehow
makes contact again (vibration?) so that the circuit is closed and a signal
is sent by itself. I don't think that is very likely just because the problem
only occurs within a certain area of the track, the gear is in third and the
rpm is climbing around the 5300 area. I was going to buy another switch,
if it wasn't too expensive, just to try it. Two ... somehow the insulation
of the wire on either end of open circuit are very close together inside the
shift lever or steering column and has become frayed so that it will at
times close the circuit. Again, for the same reason, I don't see if this
highly probable. All of which lead me to try and find if the computer
will look at other input signals and, if certain parameters are exceeded,
put itself in OD ON "mode" (my word) and thus energize the OD solenoid.
BTW, AFAIK, the OD lamp is considered part of the OD switch but,
not being an expert at reading wiring diagrams, I haven't figured out
how everything is interrelated.
I haven't been keeping totally abreast with the BBQ but I think
it's on the 24th (?), at the least the official part of it :-) I've got
a points race on the 25th. I was hoping to maybe come down
the morning of the 25th and lurk around until everyone starts
to hit the trails but, what with my problem, I'll probably still
busy trying to work around it.
To date, we've only been able to get in 5 points races because
of the rain. My problem has me in a big hole already ... notice
that it's never about lack of skill :-P The Street ET class points
leader already has a 13 points lead on me ... 14 if they don't
credit me one that I think I should have :-(
Bob
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