Toyota Yaris: Vehicle Stability Control System / Right Rear Wheel Speed Sensor Signal Stuck Low (C051223)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Right Rear Wheel Speed Sensor Signal Stuck Low (C051223)

DESCRIPTION

Refer to DTC C05121F.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C051223

Right Rear 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 rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.
  • Rear speed sensor RH
  • Wire harness and connector
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
  • Skid control ECU (brake actuator assembly)

Brake

WIRING DIAGRAM

Refer to DTC C05121F.

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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.

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

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PROCEDURE

1.

CHECK REAR SPEED SENSOR RH INSTALLATION

(a) Turn the ignition switch off.

*1

Rear Speed Sensor RH

*a

Correct

*b

Incorrect

*c

8.5 Nm

*d

No clearance

(b) Check the rear speed sensor RH installation.

OK:

There is no clearance between the rear speed sensor RH and rear 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 REAR SPEED SENSOR RH

OK

2.

CHECK REAR SPEED SENSOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the rear speed sensor RH.

Click here

(b) Check the rear speed sensor RH tip.

OK:

The rear speed sensor RH tip is free of scratches, oil, and foreign matter.

NOTICE:

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

CLEAN OR REPLACE REAR SPEED SENSOR RH
OK

3.

READ VALUE USING GTS (RR WHEEL SPEED)

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

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Wheel Speed

Rear wheel speed sensor RH 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

RR 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.

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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 (REAR 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 A108 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the O116 rear speed sensor RH 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

O116-2 (RR+) - A108-16 (RR+)

Always

Below 1 Ω

O116-2 (RR+) or A108-16 (RR+) - Body ground and other terminals

Always

10 kΩ or higher

O116-1 (RR-) - A108-15 (RR-)

Always

Below 1 Ω

O116-1 (RR-) or A108-15 (RR-) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK REAR SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the rear speed sensor rotor RH.

Click here

(b) Check the rear speed sensor rotor RH.

OK:

The rear speed sensor rotor RH is free of scratches, oil, and foreign matter.

NOTICE:

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

HINT:

  • The rear speed sensor rotor RH is incorporated into the rear axle hub and bearing assembly RH.
  • If the rear speed sensor rotor RH needs to be replaced, replace it together with the rear axle hub and bearing assembly RH.

Result

Proceed to

OK

A

NG (The rear speed sensor rotor RH is damaged.)

B

NG (There is foreign matter on the rear speed sensor rotor RH.)

C
A

REPLACE REAR SPEED SENSOR RH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

C

CLEAN REAR SPEED SENSOR ROTOR RH

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