Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028D6U
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 - 08/2023]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): C050C49; Left Rear Wheel Speed Sensor Internal Electronic Failure; 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]

DTC

C050C49

Left Rear Wheel Speed Sensor Internal Electronic Failure

DESCRIPTION

When the system is starting up and the skid control ECU (brake actuator assembly) detects a speed sensor circuit malfunction via the speed sensor circuit self-diagnosis function, this DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C49

Left Rear Wheel Speed Sensor Internal Electronic Failure

A circuit malfunction in the speed sensor is detected during the self test.

  • Rear speed sensor LH (rear axle hub and bearing assembly LH)
  • Wire harness or connector
  • Skid control sensor wire LH (No. 2 parking brake wire assembly)
  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C050C12.

Click here 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): C050C12; Left Rear Wheel Speed Sensor Circuit Short to Battery+

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (SENSOR 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 (No. 2 parking brake wire assembly)

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

(b) Disconnect the n2 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

n2-2 (RL+) - n2-1 (RL-)

Ignition switch ON

11 to 14 V

NG

GO TO STEP 7

OK

2.

CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE 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 (No. 2 parking brake wire assembly)

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

(b) Disconnect the n2 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) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

n2-2 (RL+) - Body ground

Ignition switch off

Below 1.5 V

NG

GO TO STEP 5

OK

3.

INSPECT NO. 2 PARKING BRAKE WIRE 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 Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly)

*b

Front view of wire harness connector

(to Sensor Side Connector)

*c

Front view of wire harness connector

(to Vehicle Side Connector)

(b) Disconnect the n2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire 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

n2-1 (RL-) or nO2-2 (RL-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - 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 A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire 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

nO2-2 (RL-) or A51-23 (RL-) - Body ground

Always

10 kΩ or higher

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

for Double Wishbone Type Suspension: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV [09/2022 -        ]; AXLE AND DIFFERENTIAL: REAR AXLE HUB (for Double Wishbone Type Suspension 2WD with Electric Parking Brake): REMOVAL

for Torsion Beam Type Suspension: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AXLE AND DIFFERENTIAL: REAR AXLE HUB (for Torsion Beam Type Suspension): REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE 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 (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

nO2-1 (RL+) - Body ground

Ignition switch off

Below 1.5 V

OK

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

NG

6.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - 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 (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) 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

nO2-1 (RL+) - Body ground

Always

Below 1.5 V

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (SENSOR 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 (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) 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

nO2-1 (RL+) - nO2-2 (RL-)

Ignition switch ON

11 to 14 V

OK

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

NG

8.

CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE 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 (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) 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

nO2-1 (RL+) - Body ground

Ignition switch ON

11 to 14 V

NG

GO TO STEP 11

OK

9.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - 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 (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) 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

nO2-2 (RL-) - Body ground

Always

Below 1.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - 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 A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire 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

nO2-2 (RL-) - A51-23 (RL-)

Always

Below 1 Ω

nO2-1 (RL+) or A51-39 (RL+) - nO2-2 (RL-) or A51-23 (RL-)

Always

10 kΩ or higher

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - 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 A51 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire 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

nO2-1 (RL+) - A51-39 (RL+)

Always

Below 1 Ω

nO2-1 (RL+) or A51-39 (RL+) - Body ground

Always

10 kΩ or higher

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR