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Home >> Toyota >> 2025 >> RAV4 Plug-In Hybrid SE >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (6 Of 6) & Circuit Tests (PHEV) >> Electronically Controlled Brake System >> ACC Low Pressure (X21A9) [06/2020 - ] >> Description

ACC Low Pressure (X21A9) [06/2020 - ]: Description

Code Tester Display Measurement Item Trouble Area Output ECU
X21A9 ACC Low Pressure History of a continuous and significant decrease in accumulator pressure
  • Accumulator pressure dropped due to frequent brake pedal operation
  • Pump motor malfunction
  • Accumulator deterioration
  • Accumulator pressure sensor (brake booster with master cylinder assembly)
  • Supply voltage reduced
 No. 1 skid control ECU (brake booster with master cylinder assembly)
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