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Old 04-12-2009, 04:02 PM
ulremember ulremember is offline
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Re: 1994 2500 GMC Suburban Overdrive Failure

I'm back!
Hello to all! I finally got a hold of my friends Modis Scanner. I hooked it up and went on a FEW test drives to record the operation of the Tranny. Heck, it would not shift. According to the data stream, I was in 2nd after the first shift and would not downshift back to 1st after a stop at the red light. What I did find was tha if I turn the ignition off for a few, it would indicate that I was in 1st. After the shift, it would go into second and stay. No matter what speed or how I accelerated or deccelerated. The dat stated that all of my solenoids were off. Pressures looked good for the most part (scanner has desired values). What concerns me is that the solenoids switched off when I hooked the scanner up. When I disconnected it, the tranny works like it used to. No overdrive. Now, as I looked through the troubleshotting section, it says that the symtoms point to the accumulator. Not holding pressure. I am looking at getting the solenoid kit and accumulator.
Any suggestions as to why the tranny locked in second while the scanner was hooked up?
Blessings and Happy Easter!
Chuck aka ulremember
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Thanks to all!

ulremember aka Chuck Jr.
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