When shift codes and shift complaints such as harsh shifts are found in listed Toyota/Lexus units, the accumulator control valve is frequently the culprit. If the wear is restricted to the accumulator control plunger valve and sleeve, installing Sonnax accumulator control plunger valve kit 147741-43K will eliminate cross-leaks and uncontrolled pressure loss.
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.