[DML] Re: Auto Trans behavior

["Dave Swingle" <swingle@xxxxxxxxxxx>]

I guess that's the shorter question I should have asked - how does the trans
behave in limp-home mode (i.e. when the CG fuse is blown)? Can it be fully
manual-shifted or is it what I'm seeing? Because that's essentially the mode
it's in.

I agree - in the current mode, the solenoids are in 3rd gear but the
hydraulics are in 1, 2, or 3 depending on the lever. Maybe the hydraulics
won't over-ride 3rd all the way to 1st by design, to avoid overspeeding it,
for example by pulling the lever in to 1st gear at speed. Makes sense, I
just would like to know how it is supposed to work.

Thanks;

Dave
----- Original Message ----- 
From: "David Teitelbaum" <jtrealty@xxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Sunday, June 19, 2005 10:32 PM
Subject: Re: Auto Trans behavior


>---> 3rd by moving the gearshift. Be aware that there is no governor so it
> may be possible to overspeed the trans in the lower gears. Maybe that
> is why it won't go into 1st without being commanded by a solenoid. As
> you can see the trans was designed with a "limp-home" mode. With
> complete loss of power and shift computer you go to both solenoids off
> which gets you 3rd gear. You may have trouble getting moving but it
> does allow you manual shift hold and access to 3rd gear. The fluid
> pressure is a really good indicator of the internal health of the
> transmission.---
Read the last sentance on G:01:02 left
> side, bottom Para.  Again, there is no hydraulic governor in this
> transmission to protect it.
> David Teitelbaum
> vin 10757
>
>
> --- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle@xxxx> wrote:
> > After a couple of weeks off (Houston and family stuff) I'm back to
> diagnosing the auto trans in my project car. As David T advised, I
> acquired an oil pressure gauge and hooked it up. Service manual spec
> is 8 bar (113 PSI) with the vacuum hose disconnected and in drive at
> 2500 RPM.





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