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Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Vacuum Brake Booster) - Diagnostic Codes (4 Of 8) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster) >> DTC C1256-09: Accumulator Low Pressure Abnormality Component Failure [10/2023 - ] >> Typical Enabling Conditions

Typical Enabling Conditions

ALL

Monitor runs whenever the following DTCs are not stored C0573 (Case 1): Accumulator pressure sensor lost communication
C0573 (Case 2): Accumulator pressure sensor internal malfunction
C0573 (Case 3): Accumulator pressure sensor invalid data
C149E: Accumulator pressure sensor voltage circuit low
C149F: Accumulator pressure sensor voltage circuit high
C14D3: Accumulator pressure sensor intermittent/erratic
CASE 1-1

All of the following conditions are met -
Brake booster pressure sensor fail Not detected
Brake booster pressure Less than 16.2 Mpa (165.2 kgf/cm2 , 2349 psi)
Brake Off
Brake system voltage 1 (VM1) Higher than 7.3 V
Servo pressure sensor fail Not detected
CASE 1-2

All of the following conditions are met -
Brake booster pressure sensor fail Not detected
Brake booster pressure Less than 16.2 Mpa (165.2 kgf/cm2 , 2349 psi)
Brake booster motor control circuit high Not detected
Brake Off
Brake system voltage 1 (VM1) Higher than 7.3 V
Servo pressure sensor fail Not detected
CASE 1-3

Both of the following conditions are met -
Brake booster pressure sensor fail Not detected
Brake booster pressure Less than 16.2 Mpa (165.2 kgf/cm2 , 2349 psi)