Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Left Rear Wheel Speed Sensor Signal Stuck Low (C050C23)

DESCRIPTION

Refer to DTC C050C1F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C23

Left Rear Wheel Speed Sensor Signal Stuck Low

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.*2
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more.*1
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.*2
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.*1
  • Rear speed sensor LH*1
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)*2
  • Sensor installation
  • Rear skid control sensor wire LH No. 1*2
  • Rear skid control sensor wire LH No. 2*3
  • Wire harness and connector
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
  • Skid control ECU (brake actuator assembly)
  • *1: for AWD
  • *2: for 2WD
  • *3: w/ AVS
DTC Detection Conditions: C050C23
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

Malfunction Status

At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*2

-

-

-

-

At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*1

-

-

-

-

At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph)

-

-

-

-

At a vehicle speed of 10 km/h (6 mph) or more, outputs from both rear speed sensors are 0 km/h (0 mph)*2

-

-

-

-

At a vehicle speed of 10 km/h (6 mph) or more, outputs from both rear speed sensors are 0 km/h (0 mph)*1

 

-

-

-

Detection Time

15 seconds or more

30 seconds or more

1 second or more

15 seconds or more

30 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

  • *1: for AWD
  • *2: for 2WD

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

  • After replacing or removing and installing a speed sensor rotor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

PROCEDURE

1.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

for AWD

A

for 2WD

B

B

GO TO STEP 11

A

2.

CHECK REAR SPEED SENSOR LH INSTALLATION

(a) Turn the engine switch off.

*1

Rear Speed Sensor LH

*a

Correct

*b

Incorrect

*c

8.5 Nm

*d

No clearance

(b) Check the rear speed sensor LH installation.

OK:

There is no clearance between the rear speed sensor LH and rear axle carrier sub-assembly.

The installation bolt is tightened properly.

Torque

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

NG

REINSTALL OR REPLACE REAR SPEED SENSOR LH

OK

3.

CHECK REAR SPEED SENSOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the rear speed sensor LH.

Click here

(b) Check the rear speed sensor LH tip.

OK:

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

NOTICE:

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

CLEAN OR REPLACE REAR SPEED SENSOR LH

OK

4.

READ VALUE USING TECHSTREAM (RL WHEEL SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

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/EPB > Data List

Tester Display

RL Wheel Speed

(d) Start the engine.

(e) Perform a road test.

(f) 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.

Click here

OK:

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

OK

USE SIMULATION METHOD TO CHECK

NG

5.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

w/o AVS

A

w/ AVS

B

B

GO TO STEP 8

A

6.

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

(a) Turn the engine switch off.

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

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(d) Disconnect the T1 rear speed sensor LH connector.

(e) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T1-3 (RL+) - A41-5 (RL+)

Always

Below 1 Ω

T1-3 (RL+) or A41-5 (RL+) - Body ground

Always

10 kΩ or higher

T1-1 (RL-) - A41-4 (RL-)

Always

Below 1 Ω

T1-1 (RL-) or A41-4 (RL-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK REAR SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the rear speed sensor rotor LH.

Click here

(b) Check the rear speed sensor rotor LH.

OK:

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

NOTICE:

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

HINT:

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

Result

Proceed to

OK

A

NG (The rear speed sensor rotor LH is damaged.)

B

NG (There is foreign matter on the rear speed sensor rotor LH.)

C

A

REPLACE REAR SPEED SENSOR LH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

C

CLEAN REAR SPEED SENSOR ROTOR LH

8.

INSPECT REAR SKID CONTROL SENSOR WIRE LH NO. 2

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire LH No. 2

*b

(to Sensor Side Connector)

*c

(to Vehicle Side Connector)

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

OK:

The connector is securely connected.

(c) Disconnect the z23 and T8 rear skid control sensor wire LH No. 2 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z23-1 (RL+) - T8-3 (RL+)

Always

Below 1 Ω

z23-1 (RL+) or T8-3 (RL+) - Body ground and other terminals

Always

10 kΩ or higher

z23-3 (RL-) - T8-1 (RL-)

Always

Below 1 Ω

z23-3 (RL-) or T8-1 (RL-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 2

OK

9.

INSPECT HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 2 - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) - A41-5 (RL+)

Always

Below 1 Ω

T8-3 (RL+) or A41-5 (RL+) - Body ground

Always

10 kΩ or higher

T8-1 (RL-) - A41-4 (RL-)

Always

Below 1 Ω

T8-1 (RL-) or A41-4 (RL-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

CHECK REAR SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the rear speed sensor rotor LH.

Click here

(b) Check the rear speed sensor rotor LH.

OK:

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

NOTICE:

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

HINT:

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

Result

Proceed to

OK

A

NG (The rear speed sensor rotor LH is damaged.)

B

NG (There is foreign matter on the rear speed sensor rotor LH.)

C

A

REPLACE REAR SPEED SENSOR LH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

C

CLEAN REAR SPEED SENSOR ROTOR LH

11.

CHECK REAR SPEED SENSOR LH INSTALLATION

(a) Turn the engine switch off.

*a

No clearance

*b

Correct

*c

Incorrect

(b) Check the rear speed sensor LH installation.

OK:

There is no clearance between the rear speed sensor LH and the rear axle hub and bearing assembly LH.

HINT:

The rear speed sensor rotor LH and rear speed sensor LH are incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor rotor LH needs to be replaced, replace the rear axle hub and bearing assembly LH with rear speed sensor LH.

NG

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

OK

12.

READ VALUE USING TECHSTREAM (RL WHEEL SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

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/EPB > Data List

Tester Display

RL Wheel Speed

(d) Start the engine.

(e) Perform a road test.

(f) 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.

Click here

OK:

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

OK

USE SIMULATION METHOD TO CHECK

NG

13.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

w/o AVS

A

w/ AVS

B

B

GO TO STEP 16

A

14.

INSPECT REAR SKID CONTROL SENSOR WIRE LH NO. 1

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire LH No. 1

*b

(to Sensor Side Connector)

*c

(to Vehicle Side Connector)

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

OK:

The connector is securely connected.

(c) Disconnect the j2 and Tj2 rear skid control sensor wire LH No. 1 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

j2-2 (RL+) - Tj2-3 (RL+)

Always

Below 1 Ω

j2-2 (RL+) or Tj2-3 (RL+) - Body ground and other terminals

Always

10 kΩ or higher

j2-1 (RL-) - Tj2-1 (RL-)

Always

Below 1 Ω

j2-1 (RL-) or Tj2-1 (RL-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 1

OK

15.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 1 - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Tj2-3 (RL+) - A41-5 (RL+)

Always

Below 1 Ω

Tj2-3 (RL+) or A41-5 (RL+) - Body ground

Always

10 kΩ or higher

Tj2-1 (RL-) - A41-4 (RL-)

Always

Below 1 Ω

Tj2-1 (RL-) or A41-4 (RL-) - Body ground

Always

10 kΩ or higher

HINT:

The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.

INSPECT REAR SKID CONTROL SENSOR WIRE LH NO. 1

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire LH No. 1

*b

(to Sensor Side Connector)

*c

(to Vehicle Side Connector)

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

OK:

The connector is securely connected.

(c) Disconnect the j2 and j6 rear skid control sensor wire LH No. 1 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

j2-2 (RL+) - j6-1 (RL+)

Always

Below 1 Ω

j2-2 (RL+) or j6-1 (RL+) - Body ground and other terminals

Always

10 kΩ or higher

j2-1 (RL-) - j6-3 (RL-)

Always

Below 1 Ω

j2-1 (RL-) or j6-3 (RL-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 1

OK

17.

INSPECT REAR SKID CONTROL SENSOR WIRE LH NO. 2

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

OK:

The connector is securely connected.

*a

Front view of rear skid control sensor wire LH No. 2

*b

(to Sensor Side Connector)

*c

(to Vehicle Side Connector)

(b) Disconnect the T8 rear skid control sensor wire LH No. 2 connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

j6-1 (RL+) - T8-3 (RL+)

Always

Below 1 Ω

j6-1 (RL+) or T8-3 (RL+) - Body ground and other terminals

Always

10 kΩ or higher

j6-3 (RL-) - T8-1 (RL-)

Always

Below 1 Ω

j6-3 (RL-) or T8-1 (RL-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 2

OK

18.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 2 - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) - A41-5 (RL+)

Always

Below 1 Ω

T8-3 (RL+) or A41-5 (RL+) - Body ground

Always

10 kΩ or higher

T8-1 (RL-) - A41-4 (RL-)

Always

Below 1 Ω

T8-1 (RL-) or A41-4 (RL-) - Body ground

Always

10 kΩ or higher

HINT:

The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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