Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM10000000260RO
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C050C23; Left Rear Wheel Speed Sensor Signal Stuck Low; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]

DTC

C050C23

Left Rear Wheel Speed Sensor Signal Stuck Low

DESCRIPTION

Refer to DTC C050C12.

Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C050C12; Left Rear Wheel Speed Sensor Circuit Short to Battery

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C23

Left Rear Wheel Speed Sensor Signal Stuck Low

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both rear speed sensors are 0 km/h (0 mph) for 30 seconds or more.
  • Rear speed sensor LH
  • Speed sensor installation
  • Wire harness and connector
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

WIRING DIAGRAM

Refer to DTC C050C12.

Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C050C12; Left Rear Wheel Speed Sensor Circuit Short to Battery

PROCEDURE

1.

CHECK REAR SPEED SENSOR LH INSTALLATION

(a) Check the rear speed sensor LH installation.

OK:

There is no clearance between the rear speed sensor LH and the rear axle carrier LH.

The installation bolt is tightened properly.

Torque

8.5 N*m (87 kgf*cm, 75 in.*lbf)

*1

Rear Speed Sensor LH

*a

Correct

*b

Incorrect

*c

8.5 N*m (87 kgf*cm, 75 in.*lbf)

*d

No clearance
NG

REINSTALL OR REPLACE REAR SPEED SENSOR LH

OK

2.

CHECK REAR SPEED SENSOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the rear speed sensor LH.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: REAR SPEED SENSOR (for AWD): REMOVAL

(b) Check the rear speed sensor tip LH.

OK:

The rear speed sensor tip LH is free of scratches, oil, and foreign matter.

NOTICE:

  • If there is oil or foreign matter on the rear speed sensor LH, clean the rear speed sensor LH.
  • If the rear speed sensor LH is damaged, replace the rear speed sensor LH with a new one.
NG

CLEAN OR REPLACE REAR SPEED SENSOR LH
OK

3.

READ VALUE USING GTS (RL WHEEL SPEED)

(a) Start the engine.

(b) Perform a road test.

(c) Check the rear speed sensor LH output value.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RL Wheel Speed

Rear wheel speed sensor LH reading

Min.: 0.0 km/h (0.0 mph)

Max.: 6553.5 km/h (4072 mph)

Vehicle stopped: 0.0 km/h (0.0 mph)

When driving at constant speed: No large fluctuations

Chassis > Brake/EPB > Data List

Tester Display

RL Wheel Speed

OK:

The output value changes in accordance with the vehicle speed.

OK

USE SIMULATION METHOD TO CHECK

NG

4.

CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY)

(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.

(b) Disconnect the A140 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the O205 rear speed sensor LH 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

O205-2 (RL+) - A140-5 (RL+)

Always

Below 1 Ω

O205-2 (RL+) or A140-5 (RL+) - Body ground

Always

10 kΩ or higher

O205-1 (RL-) - A140-4 (RL-)

Always

Below 1 Ω

O205-1 (RL-) or A140-4 (RL-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK REAR SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the rear speed sensor rotor LH.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AXLE AND DIFFERENTIAL: REAR AXLE HUB (for AWD without Electric Parking Brake): REMOVAL

(b) Check the rear speed sensor rotor LH.

OK:

The rear speed sensor rotor LH is free of scratches, oil, and foreign matter.

NOTICE:

  • If there is oil or foreign matter on the rear speed sensor rotor LH, clean the rear speed sensor rotor LH.
  • Do not use parts cleaner when cleaning the rear speed sensor rotor LH.
  • If the rear speed sensor rotor LH is damaged, replace the rear axle hub and bearing assembly LH with a new one.

HINT:

  • The rear speed sensor rotor LH is incorporated into the rear axle hub and bearing assembly LH.
  • If the rear speed sensor rotor LH needs to be replaced, replace it together with the rear axle hub and bearing assembly LH.

Result

Proceed to

OK

A

NG (The rear speed sensor rotor LH is damaged.)

B

NG (There is foreign matter on the rear speed sensor rotor LH.)

C
A

REPLACE REAR SPEED SENSOR LH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

C

CLEAN REAR SPEED SENSOR ROTOR LH