Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000265U3
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMMMS Made): C050C12; Left Rear Wheel Speed Sensor Circuit Short to Battery; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

DTC

C050C12

Left Rear Wheel Speed Sensor Circuit Short to Battery

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control.

The speed sensor detects the magnetic fields of the speed sensor rotor as it rotates and outputs a pulse signal.

The frequency of the pulse varies in accordance with the rotational speed of the speed sensor rotor and the system uses this to determine the wheel speed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C12

Left Rear Wheel Speed Sensor Circuit Short to Battery

A short to +B in the speed sensor signal circuit is detected for 0.12 seconds or more.
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)
  • Wire harness or connector
  • Skid control sensor wire LH
  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMMMS Made): UTILITY

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMMMS Made): TEST MODE PROCEDURE

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(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 skid control sensor wire LH

(to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))

(b) Disconnect the v1 rear speed sensor LH (rear axle hub and bearing assembly LH) connector.

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

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

v1-2 (RL+) - v1-1 (RL-)

Ignition switch ON

11 to 14 V
OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

2.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(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 Sensor Wire LH)

(b) Disconnect the vO1 skid control sensor wire LH connector.

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

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

vO1-1 (RL+) - vO1-2 (RL-)

Ignition switch ON

11 to 14 V
OK

REPLACE SKID CONTROL SENSOR WIRE LH
NG

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE 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.

*a

Front view of wire harness connector

(to Skid Control Sensor Wire LH)

(b) Disconnect the A100 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the vO1 skid control sensor wire LH connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

vO1-2 (RL-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE 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 A100 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the vO1 skid control sensor wire 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

vO1-1 (RL+) or A100-31 (RL+) - vO1-2 (RL-) or A100-18 (RL-)

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR