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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1341: Hydraulic System Malfunction (FR); DTC C1342: Hydraulic System Malfunction (FL); DTC C1343: Hydraulic System Malfunction (RR); DTC C1344: Hydraulic System Malfunction (RL) [10/2020 - 10/2023] >> Typical Enabling Conditions

Typical Enabling Conditions

C14A8 AND C14A9

Monitor runs whenever the following DTCs are not stored C0571: Accumulator pressure sensor circuit low
C0572: Accumulator pressure sensor circuit higher
C0574 (Case 1 and 2): Accumulator pressure sensor stuck
C0597 (Case 1): EEPROM malfunction
C0597 (Case 2): Lost communication
C0597 (Case 3 and 5): CPU malfunction
C0597 (Case 4): IC malfunction
C1202: Brake fluid level warning switch reservoir level too low
C121A: Accumulator pressure sensor intermittent/erratic
C1256: Accumulator pressure too low
C12A7 (Case 1, 2 and 3): Brake pressure control solenoid SLAFL circuit low
C12A8 (Case 1): Brake pressure control solenoid SLAFL circuit high/leakage
C12A8 (Case 2): Brake pressure control solenoid SLAFL circuit high
C12B2 (Case 1, 2 and 3): Brake pressure control solenoid SLRFL circuit low
C12B3 (Case 1): Brake pressure control solenoid SLRFL circuit high/leakage
C12B3 (Case 2): Brake pressure control solenoid SLRFL circuit high
C130C: Brake pressure control solenoid main relay 2 open circuit
C130D: Brake pressure control solenoid main relay 2 short circuit
C131B (Case 1): Front wheel cylinder pressure sensor LH stuck
C131B (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C131C: Front wheel cylinder pressure sensor LH open circuit
C131D: Front wheel cylinder pressure sensor LH short circuit
C131E: Front wheel cylinder pressure sensor LH noise failure
C131F: Front wheel cylinder pressure sensor LH power supply failure
C1345: Brake pressure control solenoid current learning not complete
C137C: Brake system voltage circuit low
C14A8: Brake pressure too low
C14A9: Brake pressure too high
C14D0: Accumulator pressure sensor voltage circuit check
C14F2: Brake pressure control solenoid 2 range/performance
C14F3: Brake pressure control solenoid 2 circuit low
C14F4 (Case 1): Brake pressure control solenoid 2 SMC leakage
C14F4 (Case 2): Brake pressure control solenoid 2 over current fail
All of the following conditions are met -
Front wheel cylinder pressure sensor LH fail Not detected
Front wheel brake LH On
ABS operation Off
Accumulator pressure sensor fail Not detected
Brake pressure control solenoid open current learning Complete
C14AA AND C14AB

Monitor runs whenever the following DTCs are not stored C0571: Accumulator pressure sensor circuit low
C0572: Accumulator pressure sensor circuit higher
C0574 (Case 1 and 2): Accumulator pressure sensor stuck
C0597 (Case 1): EEPROM malfunction
C0597 (Case 2): Lost communication
C0597 (Case 3 and 5): CPU malfunction
C0597 (Case 4): IC malfunction
C1202: Brake fluid level warning switch reservoir level too low
C121A: Accumulator pressure sensor intermittent/erratic
C1256: Accumulator pressure too low
C12BD (Case 1, 2 and 3): Brake pressure control solenoid SLAFR circuit low
C12BE (Case 1): Brake pressure control solenoid SLAFR circuit high/leakage
C12BE (Case 2): Brake pressure control solenoid SLAFR circuit high
C12C8 (Case 1, 2 and 3): Brake pressure control solenoid SLRFR circuit low
C12C9 (Case 1): Brake pressure control solenoid SLRFR circuit high/leakage
C12C9 (Case 2): Brake pressure control solenoid SLRFR circuit high
C12FA: Brake pressure control solenoid main relay 1 open circuit
C12FB: Brake pressure control solenoid main relay 1 short circuit
C132B (Case 1): Front wheel cylinder pressure sensor RH stuck
C132B (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C132C: Front wheel cylinder pressure sensor RH open circuit
C132D: Front wheel cylinder pressure sensor RH short circuit
C132E: Front wheel cylinder pressure sensor RH noise failure
C132F: Front wheel cylinder pressure sensor RH power supply failure
C1345: Brake pressure control solenoid current learning not complete
C13CA: Brake pressure control solenoid 1 range/performance
C13CB: Brake pressure control solenoid 1 circuit low
C13CC (Case 1): Brake pressure control solenoid 1 SMC leakage
C13CC (Case 2): Brake pressure control solenoid 1 over current fail
C14AA: Brake pressure too low
C14AB: Brake pressure too high
C14D0: Accumulator pressure sensor voltage circuit check
All of the following conditions are met -
Front wheel cylinder pressure sensor RH fail Not detected
Front wheel brake RH On
ABS operation Off
Accumulator pressure sensor fail Not detected
Brake pressure control solenoid open current learning Complete
C14AC AND C14AD

Monitor runs whenever the following DTCs are not stored C0571: Accumulator pressure sensor circuit low
C0572: Accumulator pressure sensor circuit higher
C0574 (Case 1 and 2): Accumulator pressure sensor stuck
C0597 (Case 1): EEPROM malfunction
C0597 (Case 2): Lost communication
C0597 (Case 3 and 5): CPU malfunction
C0597 (Case 4): IC malfunction
C121A: Accumulator pressure sensor intermittent/erratic
C12BD (Case 1, 2 and 3): Brake pressure control solenoid SLAFR circuit low
C12BE (Case 1): Brake pressure control solenoid SLAFR circuit high/leakage
C12BE (Case 2): Brake pressure control solenoid SLAFR circuit high
C12C8 (Case 1, 2 and 3): Brake pressure control solenoid SLRFR circuit low
C12C9 (Case 1): Brake pressure control solenoid SLRFR circuit high/leakage
C12C9 (Case 2): Brake pressure control solenoid SLRFR circuit high
C12D3 (Case 1, 2 and 3): Brake pressure control solenoid SLARL circuit low
C12D4 (Case 1): Brake pressure control solenoid SLARL circuit high/leakage
C12D4 (Case 2): Brake pressure control solenoid SLARL circuit high
C12DE (Case 1, 2 and 3): Brake pressure control solenoid SLRRL circuit low
C12DF (Case 1): Brake pressure control solenoid SLRRL circuit high/leakage
C12DF (Case 2): Brake pressure control solenoid SLRRL circuit high
C12FA: Brake pressure control solenoid main relay 1 open circuit
C12FB: Brake pressure control solenoid main relay 1 short circuit
C132B (Case 1): Front wheel cylinder pressure sensor RH stuck
C132B (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C132C: Front wheel cylinder pressure sensor RH open circuit
C132D: Front wheel cylinder pressure sensor RH short circuit
C132E: Front wheel cylinder pressure sensor RH noise failure
C133B (Case 1): Rear wheel cylinder pressure sensor LH stuck
C133B (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C133C: Rear wheel cylinder pressure sensor LH open circuit
C133D: Rear wheel cylinder pressure sensor LH short circuit
C133E: Rear wheel cylinder pressure sensor LH noise failure
C133F: Rear wheel cylinder pressure sensor LH power supply failure
C1345: Brake pressure control solenoid current learning not complete
C13CA: Brake pressure control solenoid 1 range/performance
C13CB: Brake pressure control solenoid 1 circuit low
C13CC (Case 1): Brake pressure control solenoid 1 SMC leakage
C13CC (Case 2): Brake pressure control solenoid 1 over current fail
C14AA, C14AC: Brake pressure too low
C14AB, C14AD: Brake pressure too high
C14D0: Accumulator pressure sensor voltage circuit check
All of the following conditions are met -
Rear wheel cylinder pressure sensor LH fail Not detected
Rear wheel brake LH On
ABS operation Off
Accumulator pressure sensor fail Not detected
Brake pressure control solenoid open current learning Complete
C14AE AND C14AF

Monitor runs whenever the following DTCs are not stored C0571: Accumulator pressure sensor circuit low
C0572: Accumulator pressure sensor circuit higher
C0574 (Case 1 and 2): Accumulator pressure sensor stuck
C0597 (Case 1): EEPROM malfunction
C0597 (Case 2): Lost communication
C0597 (Case 3 and 5): CPU malfunction
C0597 (Case 4): IC malfunction
C121A: Accumulator pressure sensor intermittent/erratic
C12A7 (Case 1, 2 and 3): Brake pressure control solenoid SLAFL circuit low
C12A8 (Case 1): Brake pressure control solenoid SLAFL circuit high/leakage
C12A8 (Case 2): Brake pressure control solenoid SLAFL circuit high
C12B2 (Case 1, 2 and 3): Brake pressure control solenoid SLRFL circuit low
C12B3 (Case 1): Brake pressure control solenoid SLRFL circuit high/leakage
C12B3 (Case 2): Brake pressure control solenoid SLRFL circuit high
C12D3 (Case 2 and 3): Brake pressure control solenoid SLARL circuit low
C12DE (Case 2 and 3): Brake pressure control solenoid SLRRL circuit low
C12E9 (Case 1, 2 and 3): Brake pressure control solenoid SLARR circuit low
C12EA (Case 1): Brake pressure control solenoid SLARR circuit high/leakage
C12EA (Case 2): Brake pressure control solenoid SLARR circuit high
C12F4 (Case 1, 2 and 3): Brake pressure control solenoid SLRRR circuit low
C12F5 (Case 1): Brake pressure control solenoid SLRRR circuit high/leakage
C12F5 (Case 2): Brake pressure control solenoid SLRRR circuit high
C130C: Brake pressure control solenoid main relay 2 open circuit
C130D: Brake pressure control solenoid main relay 2 short circuit
C131B (Case 1): Front wheel cylinder pressure sensor LH stuck
C131B (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C131C: Front wheel cylinder pressure sensor LH open circuit
C131D: Front wheel cylinder pressure sensor LH short circuit
C131E: Front wheel cylinder pressure sensor LH noise failure
C1334: Rear wheel cylinder pressure sensor RH power supply failure
C1345: Brake pressure control solenoid current learning not complete
C134C (Case 1): Rear wheel cylinder pressure sensor RH stuck
C134C (Case 2): Wheel cylinder pressure sensor exceeded learning limit
C134D: Rear wheel cylinder pressure sensor RH open circuit
C134E: Rear wheel cylinder pressure sensor RH short circuit
C134F: Rear wheel cylinder pressure sensor RH noise failure
C137C: Brake system voltage circuit low
C14A8, C14AC: Brake pressure too low
C14A9, C14AD: Brake pressure too high
C14D0: Accumulator pressure sensor voltage circuit check
C14F2: Brake pressure control solenoid 2 range/performance
C14F3: Brake pressure control solenoid 2 circuit low
C14F4 (Case 1): Brake pressure control solenoid 2 SMC leakage
C14F4 (Case 2): Brake pressure control solenoid 2 over current fail
All of the following conditions are met -
Rear wheel cylinder pressure sensor RH fail Not detected
Rear wheel brake RH On
ABS operation Off
Accumulator pressure sensor fail Not detected
Brake pressure control solenoid open current learning Complete