Toyota Corolla Cross: Right Front Wheel Speed Sensor Internal Electronic Failure (C050649)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev Model) / Right Front Wheel Speed Sensor Internal Electronic Failure (C050649)

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	MIL	DTC Output from	Note
C050649	Right Front Wheel Speed Sensor Internal Electronic Failure	A circuit malfunction in the speed sensor is detected during the self-test.	Front speed sensor RH Wire harness or connector Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C0506 (Case 1) Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

The skid control ECU (brake actuator assembly) has a speed sensor circuit self-diagnosis function.

When the self-diagnosis function that is performed during startup detects that there is a speed sensor circuit malfunction, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C0506: Wheel speed sensor start up test for FR
Required Sensors/Components(Main)	Skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	Skid control ECU (brake actuator assembly)
Frequency of Operation	During initial checking
Duration	-
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

TMC's intellectual property

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off.
Turn the ignition switch to ON (READY) and turn the GTS on.
Wait for 1 second or more. [*]
HINT:

[*]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Chassis / Brake/EPB* / Utility / All Readiness.
*: Electric Parking Brake System
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.

WIRING DIAGRAM

Refer to DTC C050612.

Click here

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 wire harness connector (to Front Speed Sensor RH)

(b) Disconnect the A34 front speed sensor RH 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
A34-2 (FR+) - A34-1 (FR-)	Ignition switch ON	11 to 14 V

GO TO STEP 5

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 wire harness connector (to Front Speed Sensor RH)

(b) Disconnect the A34 front speed sensor RH connector.

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
A34-2 (FR+) - Body ground	Ignition switch off	Below 1.5 V

GO TO STEP 4

3.	CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 A151 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
A34-1 (FR-) or A151-26 (FR-) - Body ground	Always	10 kΩ or higher

REPLACE FRONT SPEED SENSOR RH

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 Front Speed Sensor RH)

(b) Disconnect the A151 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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A34-2 (FR+) - Body ground	Always	Below 1.5 V

REPLACE BRAKE ACTUATOR ASSEMBLY

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 Front Speed Sensor RH)

(b) Disconnect the A34 front speed sensor RH 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
A34-2 (FR+) - Body ground	Ignition switch ON	11 to 14 V

GO TO STEP 8

6.	CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 Front Speed Sensor RH)

(b) Disconnect the A151 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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A34-1 (FR-) - Body ground	Always	Below 1.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 A151 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
A34-1 (FR-) - A151-26 (FR-)	Always	Below 1 Ω
A34-2 (FR+) or A151-21 (FR+) - A34-1 (FR-) or A151-26 (FR-)	Always	10 kΩ or higher

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 A151 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
A34-2 (FR+) - A151-21 (FR+)	Always	Below 1 Ω
A34-2 (FR+) or A151-21 (FR+) - Body ground	Always	10 kΩ or higher

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Toyota Corolla Cross: Right Front Wheel Speed Sensor Internal Electronic Failure (C050649)

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