Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: ABS Pump Motor Actuator Stuck (C142771)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / ABS Pump Motor Actuator Stuck (C142771)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C142771

ABS Pump Motor Actuator Stuck

Actuator pump motor does not operate properly.
  • Wire harness and connector
  • Brake actuator assembly (Pump motor)
  • Brake actuator assembly (Pump motor circuit)

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (MOTOR RELAY)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Chassis / Brake/EPB / Active Test.

Chassis > Brake/EPB > Active Test

Tester Display

Measurement Item

Control Range

Restrict Condition

Diagnostic Note

Motor Relay

ABS motor relay

OFF / ON

Vehicle condition: Vehicle stopped

HINT:

To protect this Actuator and Solenoid, this test will only last 5 seconds.

-
Chassis > Brake/EPB > Active Test

Tester Display

Motor Relay

(d) Check the operating sound of the pump motor when operating it using the Techstream.

Result

Proceed to

Operating sound is heard.

A

Operating sound is not heard.

B
B

GO TO STEP 4

A

2.

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

3.

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 C142771 is not output.

A

DTC C142771 is output.

B

HINT:

  • If a speed signal of 20 km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly) with the engine switch on (IG) and the stop light switch assembly off, the ECU performs self-diagnosis of the pump motor circuit.
  • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
  • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
  • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(a) Turn the engine switch off.

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

OK:

The connector is securely connected.

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

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

OK:

No deformation or corrosion.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A41-30 (GND2) - Body ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    ABS Solenoid Control Module Actuator Stuck On (C143A7E,C143A7F)
    DESCRIPTION The ABS solenoid relay is built into the skid control ECU in the brake actuator assembly. The ABS solenoid relay supplies power to the holding solenoid and reduction solenoid. The solenoid ...

    Multi-axis Acceleration Sensor Module "A" Supply Voltage Circuit Voltage Out of Range (C14D71C)
    DESCRIPTION for TFT Meter Type: The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition. This DTC is stored when the skid control ECU (brake act ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Disc Brake Pad: Replacement
    REPLACEMENT CAUTION / NOTICE / HINT NOTICE: After replacing the rear disc brake pads, the brake pedal may feel soft due to clearance between the rear disc brake pads and rear disc. Depress the brake pedal several times until the brake pedal feels firm. HINT: Use the same procedure for the RH side ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Vehicle Stability Control System: Freeze Frame Data
    FREEZE FRAME DATA FREEZE FRAME DATA (a) Using the Techstream, check the vehicle condition (ECU, sensor) when the brake system operates or a DTC is output. CHECK FREEZE FRAME DATA WHEN DTC WAS STORED HINT: Freeze frame data is stored when a DTC is output. Once freeze frame data is stored when a ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0162