January 21, 2013
In Toyota/Lexus U151E, U151F and U250E, the B3 orifice control valve and spring are biased by SLT solenoid (torque signal) pressure to control the UD/B3 brake. Regulated line pressure is routed from the 4-5 shift valve through the B3 orifice control valve to apply the UD/B3 brake. When this valve sticks, flow will diminish or no flow will go to the brake, resulting in burnt clutches or shift complaints. Reconditioning the bore and installing Sonnax oversized B3 orifice control valve kit, 27741-16K prevents future sticking.
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.