DTC C050C-23: Left Rear Wheel Speed Sensor Signal Stuck Low; DTC C0512-23: Right Rear Wheel Speed Sensor Signal Stuck Low [08/2019 - ]: Procedure

CHECK REAR SPEED SENSOR INSTALLATION

Turn the ignition switch off.

Check the rear speed sensor installation.

Refer to INSTALLATION [08/2015 - ]

There is no clearance between the sensor and the rear axle carrier.

The installation bolt is tightened properly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Normal
*b	Abnormal
*c	Clearance

Result

Proceed to
OK (for AWD)
NG (for AWD)

Result:

NG (for AWD)

INSTALL REAR SPEED SENSOR CORRECTLY. Refer to REMOVAL [08/2015 - ]

Result:

OK (for AWD)

See step 2

CHECK FRONT SPEED SENSOR (CHECK FOR FOREIGN MATTER)

Remove the rear speed sensor.
Refer to REMOVAL [08/2015 - ]

Check the speed sensor tip.

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

NOTE:

If there is oil or foreign matter on the speed sensor, clean the speed sensor.
If the speed sensor is damaged, replace the speed sensor with a new one.
Check the speed sensor signal after cleaning or replacement.
Refer to TEST MODE PROCEDURE [08/2019 - ]

Result

Proceed to
OK
NG

Result:

CLEAN OR REPLACE REAR SPEED SENSOR

Result:

See step 3

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Enter the following menus: Chassis / Brake / Data List.

According to the display on the Techstream, read the Data List.

Max.: 6553.5 km/h (4072 mph)

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
RL 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

Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire inflation, 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.

Refer to OPERATION CHECK [08/2019 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 08/2022] , or refer to OPERATION CHECK [08/2022 - ]

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [08/2019 - ]

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.
Refer to PROBLEM SYMPTOMS TABLE [08/2019 - ]

Result

Proceed to
OK
NG

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ]

Result:

See step 4

INSPECT REAR SKID CONTROL SENSOR WIRE

Turn the ignition switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the Qz1 rear skid control sensor wire connector.
for RH:
1. Disconnect the z7 rear skid control sensor wire connector.
for LH:
1. Disconnect the z8 rear skid control sensor wire connectors.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	for RH	*B	for LH
*1	Rear Skid Control Sensor Wire

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
Qz1-4 - z7-2 (RR+)	Always	Below 1 Ω
Qz1-3 - z7-1 (RR-)	Always	Below 1 Ω
Qz1-4 or z7-2 (RR+) - Body ground and other terminals	Always	10 kΩ or higher
Qz1-3 or z7-1 (RR-) - Body ground and other terminals	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
Qz1-2 - z8-2 (RL+)	Always	Below 1 Ω
Qz1-1 - z8-1 (RL-)	Always	Below 1 Ω
Qz1-2 or z8-2 (RL+) - Body ground and other terminals	Always	10 kΩ or higher
Qz1-1 or z8-1 (RL-) - Body ground and other terminals	Always	10 kΩ or higher

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [08/2019 - ]

Result

Proceed to
OK
NG

Result:

REPLACE REAR SKID CONTROL SENSOR WIRE. Refer to REMOVAL [08/2015 - ]

Result:

See step 5

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

Reconnect the Qz1 rear skid control sensor wire connector.
Turn the ignition switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A58 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
A58-16 (RR+) - z7-2 (RR+)	Always	Below 1 Ω
A58-15 (RR-) - z7-1 (RR-)	Always	Below 1 Ω
A58-16 (RR+) or z7-2 (RR+) - Body ground	Always	10 kΩ or higher
A58-15 (RR-) or z7-1 (RR-) - Body ground	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
A58-29 (RL+) - z8-2 (RL+)	Always	Below 1 Ω
A58-28 (RL-) - z8-1 (RL-)	Always	Below 1 Ω
A58-29 (RL+) or z8-2 (RL+) - Body ground	Always	10 kΩ or higher
A58-28 (RL-) or z8-1 (RL-) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 6

CHECK REAR SPEED SENSOR ROTOR (CHECK FOR FOREIGN MATTER)

Remove the component with the speed sensor rotor.
Refer to REMOVAL [08/2015 - ]

Check the speed sensor rotor.

The rotor is free of scratches, oil, and foreign matter.

NOTE:

If there is oil or foreign matter on the speed sensor rotor, clean the speed sensor rotor.
If the speed sensor rotor is damaged, replace the speed sensor rotor with a new one.
Check the speed sensor signal after cleaning or replacement.
Refer to TEST MODE PROCEDURE [08/2019 - ]

HINT:

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

Result

Result	Proceed to
OK	A
NG (The speed sensor rotor is damaged.)	B
NG (There is foreign matter on the speed sensor rotor.)	C

Result:

REPLACE REAR SPEED SENSOR. Refer to REMOVAL [08/2015 - ]

Result:

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY. Refer to REMOVAL [08/2015 - ]

Result:

CLEAN REAR SPEED SENSOR ROTOR