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Home >> Lexus >> 2023 >> NX 250 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Electronically Controlled Brake System - Diagnostic Codes (6 Of 6), Symptom Tests & Circuit Tests) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HEV Model) >> ACC Low Pressure (X21A9) [11/2021 - ] >> Description

ACC Low Pressure (X21A9) [11/2021 - ]: Description

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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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