Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Brake Pressure Sensor "A" Circuit Voltage Above Threshold (C054017)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C054017

Brake Pressure Sensor "A" Circuit Voltage Above Threshold

When vehicle speed exceeds 3 km/h (2 mph) and stop light switch assembly is OFF, master cylinder pressure continuously exceeds 1.764 MPa (18.0 kgf/cm2, 255 psi) for 5 seconds or more.

  • Wire harness and connector
  • Stop light switch assembly
  • Master cylinder pressure sensor (Brake actuator assembly)
  • Master cylinder pressure sensor circuit malfunction
  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

(c) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

(e) Turn the engine switch off.

NEXT

2.

RECONFIRM DTC

(a) Start the engine.

(b) Perform a road test.

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result

Proceed to

DTC C054017 is output

A

DTCs C054017 and P057113 are output

B

B

GO TO DTC CHART (P057113)

A

3.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)

(a) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light SW

Stop light switch assembly

(STP terminal input)

OFF / ON

OFF: Brake pedal released

ON: Brake pedal depressed

HINT:

The brake pedal state is determined using the voltage at terminal STP

Chassis > Brake/EPB > Data List

Tester Display

Stop Light SW

(b) Check that the stop light switch assembly condition observed on the Techstream changes according to brake pedal operation.

OK:

The Techstream displays OFF / ON according to brake pedal operation.

NG

GO TO STEP 7

OK

4.

READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR)

(a) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Master Cylinder Sensor 1

Master cylinder pressure sensor pressure (value detected by ECU)

Min.: -1.00 MPa

Max.: 23.99 MPa

Brake pedal released: -1.00 to 0.00 MPa

Reading increases when brake pedal is depressed

Chassis > Brake/EPB > Data List

Tester Display

Master Cylinder Sensor 1

(b) Start the engine.

(c) Check the value of Data List item Master Cylinder Sensor 1 when the brake pedal is released.

OK:

The value of Data List item Master Cylinder 1 is within standard range.

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

OK

5.

CLEAR DTC

(a) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the engine switch off.

NEXT

6.

RECONFIRM DTC

(a) Start the engine.

(b) Drive the vehicle and perform a braking test (decelerate the vehicle by depressing the brake pedal).

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result

Proceed to

DTC C054017 is not output.

A

DTC C054017 is output.

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

7.

CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

(a) Turn the engine switch off.

(b) Check the stop light switch assembly installation.

Click here

OK:

The stop light switch assembly installation are normal.

NG

INSTALL STOP LIGHT SWITCH ASSEMBLY CORRECTLY

OK

8.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly.

Click here

OK:

The stop light switch assembly is normal.

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

9.

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A41-11 (STP) - Body ground

Stop light switch assembly on (Brake pedal depressed)

8 to 14 V

A41-11 (STP) - Body ground

Stop light switch assembly off (Brake pedal released)

Below 1.5 V

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    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 ...

    Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)
    DESCRIPTION The solenoid relay and solenoid valves are built into the brake actuator assembly. The solenoid valves control the brake fluid pressure at each wheel cylinder. When this DTC is stored, the ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual > Window Defogger System: Precaution
    PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Lane Control System Intelligent Clear ...

    Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual > Outer Rear View Mirror: Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during side television camera assembly removal/installation are shown below. Necessary Procedure After Parts R ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2022 Copyright www.lexusrx.net
    0.0235