Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000260RM
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): C050C14; Left Rear Wheel Speed Sensor Circuit Short to Ground or Open; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]

DTC

C050C14

Left Rear Wheel Speed Sensor Circuit Short to Ground or Open

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

C050C14

Left Rear Wheel Speed Sensor Circuit Short to Ground or Open

An open in the speed sensor signal circuit continues for 0.5 seconds or more.

  • Rear speed sensor LH
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)

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.

READ VALUE USING GTS (MOMENTARY INTERRUPTION)

(a) Select the line graph display on the GTS.

(b) Check for any momentary interruption in the wire harness and connector.

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): DATA LIST / ACTIVE TEST

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RL Speed Open

Rear speed sensor LH open detection

Normal / Under intermittent

Normal: Momentary interruption not detected

Under intermittent: Momentary interruption detected

-

RL Speed Sensor Voltage Open

Rear speed sensor LH voltage open detection

Normal / Under intermittent

Normal: Momentary interruption not detected

Under intermittent: Momentary interruption detected

-

Chassis > Brake/EPB > Data List

Tester Display

RL Speed Open

RL Speed Sensor Voltage Open

OK:

Normal (There are no momentary interruptions.)

NOTICE:

Perform the above inspection before removing the sensor and connector.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

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

3.

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A140 skid control ECU (brake actuator assembly) connector.

*a

Front view of wire harness connector

(to Rear Speed Sensor LH)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O205-2 (RL+) - Body ground

Ignition switch ON

11 to 14 V

OK

REPLACE REAR SPEED SENSOR LH

NG

REPLACE BRAKE ACTUATOR ASSEMBLY 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL