The Aisin AW TF-80/81SC solenoid modulator valve establishes and controls feed pressure to a variety of solenoids. High or low solenoid feed pressure will adversely affect shift functions controlled by those solenoids. Wear at the inboard end of the solenoid modulator valve circuit causes excessive feed pressure. This floods the solenoids and reduces reaction time, resulting in harsh shifting and high line pressure. Wear at the outboard and mid-section reduces solenoid modulator pressure. This loss has the most effect on engagements and boost oil for line pressure rise. The Sonnax oversized solenoid modulator valve kit 39741-18K corrects wear in all areas, restoring pressure control and OE pressure calibration. This kit can be used in either of two valve body locations. The hardcoat anodized valve with annular groves and lengthened front spool combined with a wear resistant sleeve offer precision control and extended service life.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
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A vacuum test at the ports indicated fail to hold at least 18 in-Hg