Bore wear at the spring end of the valve allows the SLT circuit and regulated converter pressure to cross leak. Bore wear at the balance end of the valve reduces converter and lube flow. Boost sleeve wear results in converter pressure bleeding into and elevating EPC.
The Sonnax valve and boost assembly corrects circuit pressure loss and restores control over the secondary pressure regulator valve and boost valve function.
A worn secondary pressure regulator valve in vehicles with an Aisin AW TR-60SN, VW/Audi 09D transmission can cause several problems. Overheating the fluid, bushings, and torque converter can all be caused by a worn secondary pressure regulator valve. Drivability issues include harsh reverse engagement, TCC slip resulting in RPM surge, and poor shift quality. Sonnax kit 25741-11K is designed to correct the pressure outputs from the secondary pressure regulator valve and fix these drivability issues.
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.
January 26, 2015
Topics: Diagnostics And Theory Transmission Aisin AW VW/Audi 09D Transmission 09G, 09K, 09M Transmission TR-60SN Transmission TF-60SN TransmissionRead Now
September 30, 2005
Topics: Diagnostics And Theory TransmissionRead Now
Contact a Sonnax Parts Distributor.
A vacuum test fails to yield the indicated 16 or 18 in-hg or greater, depending on the port tested as shown, or if visual wear is detected.