DTC C0512-23: Right Rear Wheel Speed Sensor Signal Stuck Low [11/2021 - 03/2024]: Procedure

1. Check the rear speed sensor RH installation.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Rear Speed Sensor RH
   *a	Correct
   *b	Incorrect
   *c	8.5 N.m (87 kgf/cm, 75 in.lbf)
   *d	No clearance

   OK

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

   The installation bolt is tightened properly.

   Torque 

   8.5 N.m (87 kgf/cm, 75 in.lbf)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REINSTALL OR REPLACE REAR SPEED SENSOR RH. Refer to  REMOVAL [11/2021 - 03/2024] 

Result: 

OK 

See step  2

1. Remove the rear speed sensor RH.

   Refer to REMOVAL [11/2021 - 03/2024]

2. Check the rear speed sensor tip RH.

   OK

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

   NOTE:

   • 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CLEAN OR REPLACE REAR SPEED SENSOR RH 

Result: 

OK 

See step  3

1. Perform a road test.
2. Check the rear speed sensor RH output value.

   Chassis > Brake/EPB > 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 mph) Max.: 6553.5 km/h (4072 mph)	Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations

   Chassis > Brake/EPB > Data List 

   Tester Display
   RR Wheel Speed

   OK

   The output value changes in accordance with the vehicle speed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

Result: 

NG 

See step  4

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of skid control sensor wire RH (No. 1 parking brake wire assembly)
   *b	to Sensor Side Connector
   *c	to Vehicle Side Connector

2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

3. Disconnect the f2 and fG1 skid control sensor wire RH (No. 1 parking brake wire assembly) connector.
4. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   f2-1 (RA+) - fG1-4 (RR+)	Always	Below 1 Ω
   f2-1 (RA+) or fG1-4 (RR+) - Body ground and other terminals	Always	10 kΩ or higher
   f2-2 (RA-) - fG1-3 (RR-)	Always	Below 1 Ω
   f2-2 (RA-) or fG1-3 (RR-) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY 

Result: 

OK 

See step  5

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

2. Disconnect the A38 No. 2 skid control ECU (brake actuator assembly) connector.
3. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   fG1-4 (RR+) - A38-20 (RR+)	Always	Below 1 Ω
   fG1-4 (RR+) or A38-20 (RR+) - Body ground	Always	10 kΩ or higher
   fG1-3 (RR-) - A38-19 (RR-)	Always	Below 1 Ω
   fG1-3 (RR-) or A38-19 (RR-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the rear speed sensor rotor RH.

   Refer to REMOVAL [11/2021 - 03/2024]

2. Check the rear speed sensor rotor RH.

   OK

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

   NOTE:

   • 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

   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

Result: 

A 

REPLACE REAR SPEED SENSOR RH. Refer to  REMOVAL [11/2021 - 03/2024] 

Result: 

B 

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [11/2021 - 03/2024] 

Result: 

C 

CLEAN REAR SPEED SENSOR ROTOR RH