Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Right Front Wheel Speed Sensor Signal Stuck Low (C050623)

DESCRIPTION

Refer to DTC C05061F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050623

Right Front 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 front 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 front speed sensors are 0 km/h (0 mph) for 30 seconds or more.*1
  • Speed sensor installation
  • Front skid control sensor wire RH*3
  • Wire harness and connector
  • Front speed sensor RH
  • Front speed sensor rotor RH (front axle hub sub-assembly RH)
  • *1: for AWD
  • *2: for 2WD
  • *3: w/ AVS
DTC Detection Conditions: C050623
 

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 at a vehicle speed of 10 km/h (6 mph) or more

Malfunction Status

Output voltage from one of the speed sensors is less than that from the other sensors*2

-

-

-

-

Output voltage from one of the speed sensors is less than that from the other sensors*1

-

-

-

-

Output from one of the speed sensors is 0 km/h (0 mph)

-

-

-

-

Outputs from both front speed sensors are 0 km/h (0 mph)*2

-

-

-

-

Outputs from both front 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 a speed sensor rotor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

PROCEDURE

1.

CHECK FRONT SPEED SENSOR RH INSTALLATION

(a) Turn the engine switch off.

*1

Front Speed Sensor RH

*a

Correct

*b

Incorrect

*c

8.5 Nm

*d

No clearance

(b) Check the front speed sensor RH installation.

OK:

There is no clearance between the front speed sensor RH and front 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 FRONT SPEED SENSOR RH

OK

2.

CHECK FRONT SPEED SENSOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the front speed sensor RH.

Click here

(b) Check the front speed sensor RH tip.

OK:

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

NOTICE:

  • 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.
NG

CLEAN OR REPLACE FRONT SPEED SENSOR RH

OK

3.

READ VALUE USING TECHSTREAM (FR 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

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

(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

4.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

w/o AVS

A

w/ AVS

B

B

GO TO STEP 7

A

5.

CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR RH - 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 A93 front speed sensor RH 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

A93-3 (FR+) - A41-7 (FR+)

Always

Below 1 Ω

A93-3 (FR+) or A41-7 (FR+) - Body ground

Always

10 kΩ or higher

A93-4 (FR-) - A41-6 (FR-)

Always

Below 1 Ω

A93-4 (FR-) or A41-6 (FR-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the front speed sensor rotor RH.

Click here

(b) Check the front speed sensor rotor RH.

OK:

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

NOTICE:

  • 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

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

A

REPLACE FRONT SPEED SENSOR RH

B

REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH

C

CLEAN FRONT SPEED SENSOR ROTOR RH

7.

INSPECT FRONT SKID CONTROL SENSOR WIRE RH

(a) Turn the engine switch off.

*a

Front view of front skid control sensor wire RH

*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 z15 and A91 front skid control sensor wire RH 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

z15-1 (FR+) - A91-3 (FR+)

Always

Below 1 Ω

z15-1 (FR+) or A91-3 (FR+) - Body ground and other terminals

Always

10 kΩ or higher

z15-2 (FR-) - A91-4 (FR-)

Always

Below 1 Ω

z15-2 (FR-) or A91-4 (FR-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE FRONT SKID CONTROL SENSOR WIRE RH

OK

8.

CHECK HARNESS AND CONNECTOR (FRONT SKID CONTROL SENSOR WIRE RH - 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

A91-3 (FR+) - A41-7 (FR+)

Always

Below 1 Ω

A91-3 (FR+) or A41-7 (FR+) - Body ground

Always

10 kΩ or higher

A91-4 (FR-) - A41-6 (FR-)

Always

Below 1 Ω

A91-4 (FR-) or A41-6 (FR-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the component with the front speed sensor rotor RH.

Click here

(b) Check the front speed sensor rotor RH.

OK:

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

NOTICE:

  • 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

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

A

REPLACE FRONT SPEED SENSOR RH

B

REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH

C

CLEAN FRONT SPEED SENSOR ROTOR RH

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