DTC C050C-1F: Left Rear Wheel Speed Sensor Circuit Intermittent; DTC C0512-1F: Right Rear Wheel Speed Sensor Circuit Intermittent [09/2018 - 10/2023]: Procedure

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC.

Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2018 - 10/2023]

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	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Under intermittent" to "Normal".
RL Speed Sensor Voltage Open	Rear speed sensor LH voltage open detection	Under intermittent / Normal	Under intermittent: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Under intermittent" to "Normal".

Chassis > Brake > Data List

Tester Display
RR Speed Sensor Voltage Open
RL Speed Sensor Voltage Open

Normal (There are no momentary interruptions.)

HINT:

Perform the above inspection before removing the sensor and connector.

Result

Proceed to
OK
NG

Result:

See step 4

Result:

See step 2

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

Turn the engine switch off.
Connect the Techstream to the DLC3.
Start the engine.

Select the Data List using the Techstream.

Refer to DATA LIST / ACTIVE TEST [09/2018 - 10/2023]

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 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
RR Wheel Speed
RL Wheel Speed

Check the speed value output from the speed sensor displayed on the Techstream.

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.

Refer to OPERATION CHECK [12/2017 - 10/2020] , or refer to OPERATION CHECK [10/2020 - 10/2023]

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

Result

Proceed to
OK
NG

Result:

See step 4

Result:

See step 3

RECONFIRM DTC

Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

Chassis > Brake > Clear DTCs
Turn the engine switch off.
Start the engine.
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

Chassis > Brake > Trouble Codes

Result

Result	Proceed to
DTCs C050C-1F and C0512-1F are not output.	A
DTCs C050C-1F and/or C0512-1F are output.	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

CHECK REAR SPEED SENSOR INSTALLATION

Turn the engine switch off.

Check the speed sensor installation.

Refer to INSTALLATION [12/2017 - 10/2023]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Normal
*b	Abnormal
*c	Clearance

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

The installation bolt is tightened properly.

Result

Proceed to
OK
NG

Result:

INSTALL REAR SPEED SENSOR CORRECTLY. Refer to INSTALLATION [12/2017 - 10/2023]

Result:

See step 5

CHECK REAR SPEED SENSOR AND SENSOR ROTOR

Remove the rear speed sensor and the component with the sensor rotor.
For speed sensor: Refer to REMOVAL [12/2017 - ]

For sensor rotor: Refer to REMOVAL [12/2017 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

Check the speed sensor tip and speed sensor rotor.

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

NOTE:

If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.
Check the speed sensor signal after cleaning or replacement.
Refer to TEST MODE PROCEDURE [09/2018 - 10/2023]

Result

Proceed to
OK
NG

Result:

CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

Result:

See step 6

INSPECT SKID CONTROL SENSOR WIRE

Install the rear speed sensor and the component with the speed sensor rotor.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	For RH
*B	For LH
*1	Skid Control Sensor Wire
*a	Front view of wire harness connector (to Vehicle Side Connector)
*b	Front view of wire harness connector (to Sensor Side Connector)

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the z24, L178, L175 and/or LL4 skid control sensor wire connector.

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

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
z24 -2 (RR+) - L175 -3 (RR+)	Always	Below 1 Ω
z24 -2 (RR+) - L175 -4 (RR-)	Always	10 MΩ or higher
z24 -2 (RR+) or L175 -3 (RR+) - Body ground	Always	10 MΩ or higher
z24 -1 (RR-) - L175 -4 (RR-)	Always	Below 1 Ω
z24 -1 (RR-) - L175 -3 (RR+)	Always	10 MΩ or higher
z24 -1 (RR-) or L175 -4 (RR-) - Body ground	Always	10 MΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
L178 -2 (RL+) - LL4 -3	Always	Below 1 Ω
L178 -2 (RL+) - LL4 -4	Always	10 MΩ or higher
L178 -2 (RL+) or LL4 -3 - Body ground	Always	10 MΩ or higher
L178 -1 (RL-) - LL4 -4	Always	Below 1 Ω
L178 -1 (RL-) - LL4 -3	Always	10 MΩ or higher
L178 -1 (RL-) or LL4 -4 - Body ground	Always	10 MΩ or higher

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [09/2018 - 10/2023]

Result

Proceed to
OK
NG

Result:

REPLACE SKID CONTROL SENSOR WIRE. Refer to REMOVAL [12/2017 - ]

Result:

See step 7

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A9 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
A9-16 (RR+) - L175-3 (RR+)	Always	Below 1 Ω
A9-16 (RR+) or L175-3 (RR+) - Body ground	Always	10 kΩ or higher
A9-15 (RR-) - L175-4 (RR-)	Always	Below 1 Ω
A9-15 (RR-) or L175-4 (RR-) - Body ground	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
A9-29 (RL+) - LL4 -3	Always	Below 1 Ω
A9-29 (RL+) or LL4 -3 - Body ground	Always	10 kΩ or higher
A9-28 (RL-) - LL4 -4	Always	Below 1 Ω
A9-28 (RL-) or LL4 -4 - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 8

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

Reconnect the A9 skid control ECU (brake actuator assembly) connector.
Reconnect the L175 or LL4 skid control sensor wire connector (for vehicle side connector).
Turn the engine switch on (IG).

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

Standard Voltage

FOR RH

Tester Connection	Condition	Specified Condition
z24-2 (RR+) - Body ground	Engine switch on (IG)	11 to 14 V

FOR LH

Tester Connection	Condition	Specified Condition
L178-2 (RL+) - Body ground	Engine switch on (IG)	11 to 14 V

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [09/2018 - 10/2023]

Result

Proceed to
OK
NG

Result:

REPLACE REAR SPEED SENSOR. Refer to REMOVAL [12/2017 - ]

Result:

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]