Question about Cadillac Cars & Trucks
95 Cadillac Seville SLS wont shift to high gear. Shift solenoids have been replaced. Hovers around 3.5 - 4k rpms at 60 mph
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Posted on Jan 02, 2017
SOURCE: Hello, I own a 93
The transmission is controlled by the Transmission Control Unit (TCU).
Throttle position, rpm, and speed are input parameters to the TCU. The TCU has a default set of shift patterns. These shift patterns change over time based on your specific vehicle setup and driving habbits.
The shift patterns are only slightly affected by driving habbits over many driving cycles. But, changing the relationship between the throttle position and the actual speed being reported by the speed sensor can have an immediate effect on shift patterns.
While your speedo may now be correct, the realtionship between rpm and thottle position has not been corrected. That would take a gear change in the differentials.
The TCU can be reset to an inital learn base line. When this is done, the TCU will instantly learn the dynamics of your setup.
Any shop with an advanced ODB scan tool can reset the the TCU. The dealer or a transmission shop would be preferable.
You really should change your differential gears as opposed to resetting the TCU
This information was posted by ftgiles here
Posted on Jan 06, 2009
could be shift solenoids . on ebay for $50. are located in the bottom of transmission. remove pan and u should see the valve body it has about 20 screwes in it unbolt it it is a 10mm socket u will need. take it out and unbolt the back side of throttle body be carfull to remember where the little berings . now use a screw driver to pull the clipps holding the shift solinoids in place and reinstall
Posted on Mar 21, 2010
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