Circuit Description

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.

Fig 1: Identifying Pressure Sensor Or Switch Malfunction Circuit Description

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If this code (C1254/54) is output, the following conditions will occur:

The ABS, VSC TRAC, and brake warning lights and slip and VSC OFF indicator lights will come on.
The skid control buzzer sounds.
Control of all systems other than EBD is canceled.

Fig 2: DTC Detection Condition And Trouble Area Chart