DTC C0226/21, C0236/22, C0246/23, C0256/24: Open or Short Circuit in Hydraulic Brake Booster Solenoid Circuit (SFR/SFL/SRR/SRL Circuit): Wiring Diagram

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.