Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Brake Pressure Sensor "A" Circuit Voltage Below Threshold (C054016,C05401C,C05401F,C054029,C05402A,C054031,C054049,C054096)

Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake Pressure Sensor "A" Circuit Voltage Below Threshold (C054016,C05401C,C05401F,C054029,C05402A,C054031,C054049,C054096)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

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:

  • 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), master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 60 seconds.
  • 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, master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more continuously for 30 seconds.
  • Master cylinder pressure does not increase 0.048 MPa (0.5 kgf/cm2, 6.9 psi) or more 5 times or more while vehicle speed decreases from 40 km/h (25 mph) to 0 km/h (0 mph).

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:

  • When voltage at terminal +BS is 9.5 V or higher, power supply voltage of master cylinder pressure sensor is continuously low for 1 second or more.
  • When master cylinder pressure sensor power supply voltage has risen, master cylinder pressure sensor has overheated or overcurrent of master cylinder pressure sensor continues for 1.2 seconds or more.

Skid control ECU (brake actuator assembly)

C054096

Brake Pressure Sensor "A" Component Internal Failure

Either of the following is detected:

  • Master cylinder pressure exceeds 23.328 MPa (237.8 kgf/cm2, 3382 psi) continuously for 0.1 seconds.
  • Master cylinder temperature exceeds 150°C (302°F) continuously for 0.1 seconds.

Skid control ECU (brake actuator assembly)

DTC Detection Conditions: C05402A
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

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)

-

-

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

-

-

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

-

-

Malfunction Status

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

-

-

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

-

-

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

-

-

Detection Time

60 seconds or more

30 seconds or more

-

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

DTC Detection Conditions: C054049
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When voltage at terminal +BS is 9.5 V or higher

-

Malfunction Status

Power supply voltage of master cylinder pressure sensor is continuously

-

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

-

Detection Time

1 second or more

1.2 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C054096
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

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

-

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

-

Detection Time

0.1 seconds or more

0.1 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

Click here

PROCEDURE

1.

REPLACE BRAKE ACTUATOR ASSEMBLY

(a) Replace the skid control ECU (brake actuator assembly).

Click here

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Enter the following menus: Chassis / Brake/EPB / Utility / Calibration.

(e) Perform "Calibration".

Click here

Chassis > Brake/EPB > Utility

Tester Display

Calibration

(f) Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.

(g) Perform "Signal Check".

Click here

Chassis > Brake/EPB > Utility

Tester Display

Signal Check

NEXT

END

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