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

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