DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 127 (Electronically Controlled Brake System (HV) - Diagnostic Codes (11 Of 11), Symptom Tests & Circuit Tests) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> ACC Low Pressure (X21A9) [12/2019 - ] >> Description

ACC Low Pressure (X21A9) [12/2019 - ]: Description

WARNING: This page is about a different variant/trim than selected.
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)
Diesel-Data.com