TLAV transmission won't upshift from 1st

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TLAV transmission won't upshift from 1st

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21-02-20, 17:54

Paul Singleton Paul Singleton is offline

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Join Date: Feb 2003

Location: Yarker Ontario Canada

Posts: 514

Allison

Although I am not familiar with this particular model of Allison trans if the output speed sensor signal is lost the trans will not upshift. The on road trans also uses this signal for the speedometer. Also metal particles may be present on the sensor itself, causing a poor signal. If the sensor is accessible you may be able to test it with a multimeter and see if there is a voltage signal when moving.

Paul

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