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960 AW 30 transmission shifting- desperate and frustrated. 900 1993

posted by  david hunter on  Thu Jun 11 03:31 CST 2009
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last visit: Mon Jun 30 22:10 CST 2014
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My daughter's 960 has been delivered to me for repair. All shifting is "late", by that I mean rpm's will be up very high (3500 or so) before a upshift will happen. This occurs between all gears, even with very light throttle, will only hit 4th at speeds above 65 mph, don't think TC lock up is happening at all. In any gear the slightest bit of throttle pressure will cause immediate downshift.

No fault codes from transmission ECU.
All tests pass.
Fluid clear and unburned. proper level.

I am sure that the transmission itself is OK. I have checked the voltage signals from the ECU to the shift solonoids and the tranny is doing exactly what it is told. In other words the ECU for some reason is telling the tranny to shift late.

This problem is driving me nuts, have checked all sensor inputs related to shifting such as throttle position, speed, rpm, tranny temperature, mode, gear selection and more. Have even disconnected battery overnight with the thought that maybe the ECU's needed to be reset.

Desperate for information and suggestions.
--
David Hunter






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