BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): C050C14; Left Rear Wheel Speed Sensor Circuit Short to Ground or Open; 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000028D6P
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): C050C14; Left Rear Wheel Speed Sensor Circuit Short to Ground or Open; 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]

DTC

C050C14

Left Rear Wheel Speed Sensor Circuit Short to Ground or Open

DESCRIPTION

Refer to DTC C050C12

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C050C14	Left Rear Wheel Speed Sensor Circuit Short to Ground or Open	A short or open circuit is detected in the speed sensor signal circuit 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 (No. 2 parking brake wire assembly) Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C050C12.

Click here

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 (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.

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

GO TO STEP 4

2.	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.

Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)

Front view of wire harness connector

(to Sensor Side Connector)

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.

(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

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

3.	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.

(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

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

for Double Wishbone Type Suspension: Click here

for Torsion Beam Type Suspension: Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	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.

Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)

Front view of wire harness connector

(to Sensor Side Connector)

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.

(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-) - nO2-2 (RL-)	Always	Below 1 Ω

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

5.	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.

(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

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR