DTC C1256/56 Accumulator Low Pressure: Description

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

Fig 1: Master Cylinder Solenoid Communication Diagram

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
C1256/56	Fluid pressure inside the accumulator is below the standard value	Hydraulic brake booster Hydraulic brake booster pump motor Hydraulic brake booster pump motor circuit Accumulator pressure sensor