Toyota Yaris: 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.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

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

(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

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

(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

(a) Operate the GTS to clear the codes.

(b) Press the DTC clear button.

(c) Turn the ignition switch off.

NEXT

(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.

(c) Check if the same DTC is output.

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

(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

(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.

NG

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

OK

(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:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(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:

OK

REPLACE REAR SPEED SENSOR RH

NG

REPLACE BRAKE ACTUATOR ASSEMBLY