Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Brake Pressure Sensor "A" Circuit Voltage Below Threshold (C054016,C05401C,C05401F,C054029,C05402A,C054031,C054049,C054096)

C054016

Brake Pressure Sensor "A" Circuit Voltage Below Threshold

Master cylinder pressure is below -0.744 MPa (-7.6 kgf/cm2, -107 psi) for 5 seconds or more.

Skid control ECU (brake actuator assembly)

C05401C

Brake Pressure Sensor "A" Circuit Voltage Out of Range

When vehicle speed is 7 km/h (4.3 mph) or more, braking is performed (stop light switch assembly is ON) and master cylinder pressure differential value is below 20 MPa/s, difference between master cylinder pressure estimated from vehicle deceleration and master cylinder pressure sensor input value is large for 1 second or more 5 times or more for 9 trips.

Skid control ECU (brake actuator assembly)

C05401F

Brake Pressure Sensor "A" Circuit Intermittent

When vehicle speed is 10 km/h (6 mph) or more, noise in master cylinder pressure value occurs 7 times or more in 5 seconds.

Skid control ECU (brake actuator assembly)

C054029

Brake Pressure Sensor "A" Signal Invalid

Master cylinder pressure sensor invalid condition continues for 0.2 seconds or more.

Skid control ECU (brake actuator assembly)

C05402A

Brake Pressure Sensor "A" Signal Stuck In Range

Any of the following is detected:

Skid control ECU (brake actuator assembly)

C054031

Brake Pressure Sensor "A" No Signal

Master cylinder pressure sensor communication invalid condition continues for 0.1 seconds or more.

Skid control ECU (brake actuator assembly)

C054049

Brake Pressure Sensor "A" Internal Electronic Failure

Any of the following is detected:

Skid control ECU (brake actuator assembly)

C054096

Brake Pressure Sensor "A" Component Internal Failure

Either of the following is detected:

Skid control ECU (brake actuator assembly)

Diagnosis Condition

When vehicle speed is 7 km/h (4.3 mph) or more and master cylinder pressure exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi)

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-

-

When vehicle speed is 7 km/h (4.3 mph) and master cylinder pressure is 2.45 MPa (25.0 kgf/ cm2, 355 psi) or more

-

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-

Vehicle speed decreases from 40 km/h (25 mph) to 0 km/h (0 mph)

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-

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Malfunction Status

Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously

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-

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Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously

-

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-

Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more 5 times or more

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-

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Detection Time

60 seconds or more

30 seconds or more

-

Number of Trips

1 trip

1 trip

1 trip

Diagnosis Condition

When voltage at terminal +BS is 9.5 V or higher

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-

Malfunction Status

Power supply voltage of master cylinder pressure sensor is continuously

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-

When master cylinder pressure sensor power supply voltage has risen, master cylinder pressure sensor has overheated or overcurrent of master cylinder pressure sensor continues

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Detection Time

1 second or more

1.2 seconds or more

Number of Trips

1 trip

1 trip

Diagnosis Condition

-

-

-

Malfunction Status

Master cylinder pressure exceeds 23.328 MPa (237.8 kgf/cm2, 3382 psi) continuously

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-

Master cylinder temperature exceeds 150°C (302°F) continuously

-

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Detection Time

0.1 seconds or more

0.1 seconds or more

Number of Trips

1 trip

1 trip

1.

REPLACE BRAKE ACTUATOR ASSEMBLY

Calibration

Signal Check

END