Wear at the solenoid modulator accumulator bores in Aisin AW TF-81 units is very common. Wear allows solenoid feed pressure to exhaust resulting in various shift complaints and/or codes. Sonnax solenoid modulator accumulator piston kit 39741-14K incorporates an O-ring for positive sealing and annular grooves for better centering and wear prevention.
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.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.