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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Electronically Controlled Brake System (HV) - Diagnostic Codes (07 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1256-09: Accumulator Low Pressure Abnormality Component Failure [12/2019 - 10/2021] >> Typical Enabling Conditions

Typical Enabling Conditions

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ALL

Monitor runs whenever the following DTCs are not stored C0573 (Case 2): Accumulator pressure sensor internal malfunction
C0573 (Case 3): Accumulator pressure sensor invalid data
C0573 (Case 4): Accumulator pressure sensor lost communication
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

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)
Servo pressure sensor fail Not detected