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2002 to 2013 Toyota and Lexus vehicles equipped with a U150, U151 and U250 series automatic transmissions with high mileage may have a worn out B1 and B2 switch boost valves and bushings as well as the main line pressure boost valve and bushing.
The computer determines the appropriate line pressure value in accordance with the calculated load input. The ECM will then send the amount of current needed to the SLT solenoid to raise or lower the main line pressure in accordance to the driving conditions. Adequate main line pressure is required to provide enough clamping force under all load conditions to prevent slipping as well as to achieve proper shift quality.
A compromised EPC boost valve and bushing will cause complaints of slow or lazy pressure boost, soft shifts, flare shifts, burnt frictions and burnt lock-up clutch can occur. These can also be accompanied by a wide variety of gear ratio, shift and solenoid performance codes. Main line pressure also acts on the B1 and B2 switch boost valves to control when they apply. Consequently, when these boost valves stick, apply and release of the B1 and B2 is impaired causing a bind-up between two gears.
Features and benefits:
The TransGo drop-in USA-made hardened steel boost valves and bushing assemblies provides you with a durable direct replacement for the soft aluminum OEM assembly that are prone to wear.
- Insufficient line rise
- Soft, slipping or flaring shifts
- Codes P0741, P0746, P0766, P0771, P0776, P0776, P0796, P2714 and P2757
- Bind-up between two gears
- USA-made hardened steel main line boost valve and bushing
- Gold shim (for some applications)
- USA-made hardened steel B1 switch valve and bushing
- USA-made hardened steel B2 switch valve and bushing
Using # SK U151 with this boost kit is an excellent way to prevent common problems in high mileage Toyota/Lexus U150, U151 and U250 transmissions and are a key part of a successful repair.