DTC C0506-23: Right Front Wheel Speed Sensor Signal Stuck Low [10/2022 - ]: Procedure

Pre-procedure1

• Turn the ignition switch off.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Correct
  *b	Incorrect

• Check the front speed sensor RH installation.

  OK

  There is no clearance between the front speed sensor RH and front steering knuckle RH.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REINSTALL OR REPLACE FRONT SPEED SENSOR RH 

w/o AVS: Refer to INSTALLATION [10/2022 - ]

w/ AVS: Refer to INSTALLATION [10/2022 - ]

Result: 

OK 

See step  2

Pre-procedure1

• Remove the front speed sensor RH.

  HINT: 

  w/o AVS: Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

  w/ AVS: Refer to REMOVAL [10/2022 - ]

• Check the front speed sensor RH tip.

  OK

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

  NOTE:

  • If there is oil or foreign matter on the front speed sensor RH, clean the front speed sensor RH.
  • If the front speed sensor RH is damaged, replace the front speed sensor RH with a new one.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

CLEAN OR REPLACE FRONT SPEED SENSOR RH 

Result: 

OK 

See step  3

Pre-procedure1

• Drive the vehicle and perform a road test.

• Check the speed value output from the speed sensor displayed on the GTS.

  Chassis > Brake/EPB > Data List 

  Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
  FR Wheel Speed	Front 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/EPB > Data List 

  Tester Display
  FR Wheel Speed

  OK

  The output value changes in accordance with the vehicle speed.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

NG 

See step  4

1. Check the vehicle specification.

   Result

   Result	Proceed to
   w/o AVS	A
   w/ AVS	B

Result: 

B 

See step  7

Result: 

A 

See step  5

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A31 skid control ECU (brake actuator assembly) connector.
• Disconnect the A128 front speed sensor RH connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A128-5 (FR+) - A31-7 (FR+)	Always	Below 1 Ω	Ω
  A128-5 (FR+) or A31-7 (FR+) - Body ground	Always	10 kΩ or higher	kΩ
  A128-6 (FR-) - A31-6 (FR-)	Always	Below 1 Ω	Ω
  A128-6 (FR-) or A31-6 (FR-) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Pre-procedure1

• Remove the component with the front speed sensor rotor RH.

  HINT: 

  Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

• Check the front speed sensor rotor RH.

  OK

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

  NOTE:

  • If there is oil or foreign matter on the front speed sensor rotor RH, clean the front speed sensor rotor RH.
  • Do not use parts cleaner when cleaning the front speed sensor rotor RH.
  • If the front speed sensor rotor RH is damaged, replace the front speed sensor rotor RH with a new one.

  HINT: 

  • The front speed sensor rotor RH is incorporated into the front axle hub sub-assembly RH.
  • If the front speed sensor rotor RH needs to be replaced, replace it together with the front axle hub sub-assembly RH.

  Result

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

Post-procedure1

• None

Result: 

A 

REPLACE FRONT SPEED SENSOR RH 

w/o AVS: Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

w/ AVS: Refer to REMOVAL [10/2022 - ]

Result: 

B 

REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

Result: 

C 

CLEAN FRONT SPEED SENSOR ROTOR RH 

1. Turn the ignition switch off.
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 i2 and Ai2 skid control sensor wire RH 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	Result
   i2-3 (FR+) - Ai2-5 (FR+)	Always	Below 1 Ω	Ω
   i2-3 (FR+) or Ai2-5 (FR+) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
   i2-1 (FR-) - Ai2-6 (FR-)	Always	Below 1 Ω	Ω
   i2-1 (FR-) or Ai2-6 (FR-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SKID CONTROL SENSOR WIRE RH. Refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  8

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 A31 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	Result
   Ai2-5 (FR+) - A31-7 (FR+)	Always	Below 1 Ω	Ω
   Ai2-5 (FR+) or A31-7 (FR+) - Body ground	Always	10 kΩ or higher	kΩ
   Ai2-6 (FR-) - A31-6 (FR-)	Always	Below 1 Ω	Ω
   Ai2-6 (FR-) or A31-6 (FR-) - Body ground	Always	10 kΩ or higher	kΩ

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Remove the component with the front speed sensor rotor RH.

   HINT: 

   Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

2. Check the front speed sensor rotor RH.

   OK

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

   NOTE:

   • If there is oil or foreign matter on the front speed sensor rotor RH, clean the front speed sensor rotor RH.
   • Do not use parts cleaner when cleaning the front speed sensor rotor RH.
   • If the front speed sensor rotor RH is damaged, replace the front speed sensor rotor RH with a new one.

   HINT: 

   • The front speed sensor rotor RH is incorporated into the front axle hub sub-assembly RH.
   • If the front speed sensor rotor RH needs to be replaced, replace it together with the front axle hub sub-assembly RH.

   Result

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

Result: 

A 

REPLACE FRONT SPEED SENSOR RH. Refer to  REMOVAL [10/2022 - ] 

Result: 

B 

REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

Result: 

C 

CLEAN FRONT SPEED SENSOR ROTOR RH