DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low [12/2019 - ]: Procedure

1. Check the front speed sensor LH installation.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Speed Sensor LH
   *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 front speed sensor LH and front steering knuckle LH.

   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 FRONT SPEED SENSOR LH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  2

1. Remove the front speed sensor LH.

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - ]

2. Check the front speed sensor tip LH.

   OK

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

   NOTE:

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CLEAN OR REPLACE FRONT SPEED SENSOR LH 

Result: 

OK 

See step  3

1. Start the engine.
2. Perform a road test.
3. Check the front speed sensor LH output value.

   Chassis > Brake/EPB > Data List 

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

   Tester Display
   FL 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 [12/2019 - ] 

Result: 

NG 

See step  4

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 A41 front speed sensor LH connector.
4. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
5. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A41-1 (FL+) - A39-22 (FL+)	Always	Below 1 Ω
   A41-1 (FL+) or A39-22 (FL+) - Body ground	Always	10 kΩ or higher
   A41-2 (FL-) - A39-21 (FL-)	Always	Below 1 Ω
   A41-2 (FL-) or A39-21 (FL-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

2. Check the front speed sensor rotor LH.

   OK

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

   NOTE:

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

   HINT: 

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

   Result

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

Result: 

A 

REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

Result: 

B 

REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

C 

CLEAN FRONT SPEED SENSOR ROTOR LH