Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)

Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C122D14

Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open

Master cylinder pressure sensor power supply voltage decrease occurs or history of voltage decrease exists, and defective master cylinder pressure sensor output continues for 1.2 seconds or more.
  • Master cylinder pressure sensor output defective
  • 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.

CHECK HARNESS AND CONNECTOR (+BS 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

A41-14 (+BS) - Body ground

Always

11 to 14 V

A41-14 (+BS) -A41-1 (GND1)

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CLEAR DTC

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

(b) Connect the Techstream to the DLC3.

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

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

Chassis > Brake/EPB > Clear DTCs

(e) Press the DTC clear button.

(f) Turn the engine switch off.

NEXT

3.

RECONFIRM DTC

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

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

Chassis > Brake/EPB > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

DTC C122D14 is not output.

A

DTC C122D14 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

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