Toyota Yaris: Vehicle Stability Control System / Left Front Wheel Speed Sensor Signal Stuck Low (C050023)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Left Front Wheel Speed Sensor Signal Stuck Low (C050023)

DESCRIPTION

Refer to DTC C05001F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C050023

Left Front Wheel Speed Sensor Signal Stuck Low

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 30 seconds or more.
  • Speed sensor installation
  • Wire harness and connector
  • Front speed sensor LH
  • Front speed sensor rotor LH (front axle hub sub-assembly LH)

Brake

WIRING DIAGRAM

Refer to DTC C05001F.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • 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

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

    Click here

PROCEDURE

1.

CHECK FRONT SPEED SENSOR LH INSTALLATION

(a) Turn the ignition switch off.

*1

Front Speed Sensor LH

*a

Correct

*b

Incorrect

*c

8.5 Nm

*d

No clearance

(b) Check the front speed sensor LH installation.

OK:

There is no clearance between the front speed sensor LH and front axle carrier sub-assembly.

The installation bolt is tightened properly.

Torque

8.5 N*m (87 kgf*cm, 75 in.*lbf)

NG

REINSTALL OR REPLACE FRONT SPEED SENSOR LH

OK

2.

CHECK FRONT SPEED SENSOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the front speed sensor LH.

Click here

(b) Check the front speed sensor LH tip.

OK:

The front speed sensor LH tip is free of scratches, oil, and foreign matter.

NOTICE:

  • If there is oil or foreign matter on the front speed sensor LH, clean the front speed sensor LH.
  • If the front speed sensor LH is damaged, replace the front speed sensor LH with a new one.
NG

CLEAN OR REPLACE FRONT SPEED SENSOR LH
OK

3.

READ VALUE USING GTS (FL WHEEL SPEED)

(a) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Wheel Speed

Front wheel speed sensor LH reading

Min.: 0.0 km/h (0.0 mph)

Max.: 6553.5 km/h (4072 mph)

Vehicle stopped: 0.0 km/h (0.0 mph)

When driving at constant speed: No large fluctuations
Chassis > Brake > Data List

Tester Display

FL Wheel Speed

(b) Drive the vehicle and perform a road test.

(c) Check the speed value output from the speed sensor displayed on the GTS.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire pressure, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.

Click here

OK:

The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.

OK

USE SIMULATION METHOD TO CHECK

NG

4.

CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A22 front speed sensor LH connector.

(d) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

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

OK:

No deformation or corrosion.

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A22-1 (FL+) - A108-18 (FL+)

Always

Below 1 Ω

A22-1 (FL+) or A108-18 (FL+) - Body ground

Always

10 kΩ or higher

A22-2 (FL-) - A108-17 (FL-)

Always

Below 1 Ω

A22-2 (FL-) or A108-17 (FL-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the front speed sensor rotor LH.

Click here

(b) Check the front speed sensor rotor LH.

OK:

The front speed sensor rotor LH is free of scratches, oil, and foreign matter.

NOTICE:

  • If there is oil or foreign matter on the front speed sensor rotor LH, clean the front speed sensor rotor LH.
  • Do not use parts cleaner when cleaning the front speed sensor rotor LH.
  • If the front speed sensor rotor LH is damaged, replace the front speed sensor rotor LH with a new one.

HINT:

  • The front speed sensor rotor LH is incorporated into the front axle hub sub-assembly LH.
  • If the front speed sensor rotor LH needs to be replaced, replace it together with the front axle hub sub-assembly LH.

Result

Proceed to

OK

A

NG (The front speed sensor rotor LH is damaged.)

B

NG (There is foreign matter on the front speed sensor rotor LH.)

C
A

REPLACE FRONT SPEED SENSOR LH

B

REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH

C

CLEAN FRONT SPEED SENSOR ROTOR LH

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