Toyota Yaris: Vehicle Stability Control System / Right Rear Wheel Speed Sensor Circuit Intermittent (C05121F)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Right Rear Wheel Speed Sensor Circuit Intermittent (C05121F)

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

HINT:

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C05121F

Right Rear Wheel Speed Sensor Circuit Intermittent

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less, an open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation 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

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

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

    Click here

PROCEDURE

1.

READ VALUE USING GTS (RR SPEED SENSOR VOLTAGE OPEN)

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

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Speed Sensor Voltage Open

Rear speed sensor RH voltage open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Chassis > Brake > Data List

Tester Display

RR Speed Sensor Voltage Open

(b) Select the line graph display.

(c) Check for any momentary interruption in the wire harness and connector.

Click here

OK:

Normal (There are no momentary interruptions.)

NOTICE:

Perform the above inspection before removing the sensor and connector.

NG

GO TO STEP 5

OK

2.

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.

Click here

OK:

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

NG

GO TO STEP 5

OK

3.

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the ignition switch off.

NEXT

4.

RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

(c) Check if the same DTC is output.

Result

Proceed to

C05121F is not output

A

C05121F is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

5.

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 RH.

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

6.

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

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

for rear speed sensor RH: Click here

for rear speed sensor rotor RH: Click here

(b) Check the rear speed sensor RH tip and rear speed sensor rotor RH.

OK:

No scratches, oil, or foreign matter on the rear speed sensor RH tip and rear speed sensor rotor RH.

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.
  • 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.
NG

CLEAN OR REPLACE REAR SPEED SENSOR RH OR COMPONENT WITH REAR SENSOR ROTOR RH

OK

7.

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

Always

10 kΩ or higher

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

Always

Below 1 Ω

O116-1 (RR-) or A108-15 (RR-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A108 skid control ECU (brake actuator assembly) connector.

(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.

*a

Front view of wire harness connector

(to Rear Speed Sensor RH)

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O116-2 (RR+) - Body ground

Ignition switch ON

11 to 14 V

OK

REPLACE REAR SPEED SENSOR RH

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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