Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Right Rear Wheel Speed Sensor Signal Stuck Low (C051223)

DESCRIPTION

Refer to DTC C05121F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C051223

Right 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 RH*1
  • Rear speed sensor RH (rear axle hub and bearing assembly RH)*2
  • Sensor installation
  • Rear skid control sensor wire RH No. 1*2
  • Rear skid control sensor wire RH No. 2*3
  • Wire harness and connector
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
  • Skid control ECU (brake actuator assembly)
  • *1: for AWD
  • *2: for 2WD
  • *3: w/ AVS
DTC Detection Conditions: C051223
 

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 RH INSTALLATION

(a) Turn the engine switch off.

*1

Rear Speed Sensor RH

*a

Correct

*b

Incorrect

*c

8.5 Nm

*d

No clearance

(b) Check the rear speed sensor RH installation.

OK:

There is no clearance between the rear speed sensor RH 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 RH

OK

3.

CHECK REAR SPEED SENSOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the rear speed sensor RH.

Click here

(b) Check the rear speed sensor RH tip.

OK:

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

NOTICE:

  • 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.
NG

CLEAN OR REPLACE REAR SPEED SENSOR RH

OK

4.

READ VALUE USING TECHSTREAM (RR 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

RR Wheel Speed

Rear 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

RR 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 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 T2 rear 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

T2-2 (RR+) - A41-20 (RR+)

Always

Below 1 Ω

T2-2 (RR+) or A41-20 (RR+) - Body ground

Always

10 kΩ or higher

T2-1 (RR-) - A41-19 (RR-)

Always

Below 1 Ω

T2-1 (RR-) or A41-19 (RR-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

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

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

Click here

(b) Check the rear speed sensor rotor RH.

OK:

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

NOTICE:

  • 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

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

A

REPLACE REAR SPEED SENSOR RH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

C

CLEAN REAR SPEED SENSOR ROTOR RH

8.

INSPECT REAR SKID CONTROL SENSOR WIRE RH NO. 2

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire RH 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 z22 and T7 rear skid control sensor wire RH 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

z22-1 (RR+) - T7-2 (RR+)

Always

Below 1 Ω

z22-1 (RR+) or T7-2 (RR+) - Body ground and other terminals

Always

10 kΩ or higher

z22-3 (RR-) - T7-1 (RR-)

Always

Below 1 Ω

z22-3 (RR-) or T7-1 (RR-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE RH NO. 2

OK

9.

INSPECT HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE RH 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

T7-2 (RR+) - A41-20 (RR+)

Always

Below 1 Ω

T7-2 (RR+) or A41-20 (RR+) - Body ground

Always

10 kΩ or higher

T7-1 (RR-) - A41-19 (RR-)

Always

Below 1 Ω

T7-1 (RR-) or A41-19 (RR-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

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

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

Click here

(b) Check the rear speed sensor rotor RH.

OK:

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

NOTICE:

  • 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

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

A

REPLACE REAR SPEED SENSOR RH

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

C

CLEAN REAR SPEED SENSOR ROTOR RH

11.

CHECK REAR SPEED SENSOR RH INSTALLATION

(a) Turn the engine switch off.

*a

No clearance

*b

Correct

*c

Incorrect

(b) Check the rear speed sensor RH installation.

OK:

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

HINT:

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

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

NG

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

OK

12.

READ VALUE USING TECHSTREAM (RR 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

RR Wheel Speed

Rear 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

RR 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 RH NO. 1

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire RH 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 j1 and Tj1 rear skid control sensor wire RH 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

j1-2 (RR+) - Tj1-2 (RR+)

Always

Below 1 Ω

j1-2 (RR+) or Tj1-2 (RR+) - Body ground and other terminals

Always

10 kΩ or higher

j1-1 (RR-) - Tj1-1 (RR-)

Always

Below 1 Ω

j1-1 (RR-) or Tj1-1 (RR-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE RH NO. 1

OK

15.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE RH 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

Tj1-2 (RR+) - A41-20 (RR+)

Always

Below 1 Ω

Tj1-2 (RR+) or A41-20 (RR+) - Body ground

Always

10 kΩ or higher

Tj1-1 (RR-) - A41-19 (RR-)

Always

Below 1 Ω

Tj1-1 (RR-) or A41-19 (RR-) - Body ground

Always

10 kΩ or higher

HINT:

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

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

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.

INSPECT REAR SKID CONTROL SENSOR WIRE RH NO. 1

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire RH 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 j1 and j5 rear skid control sensor wire RH 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

j1-2 (RR+) - j5-1 (RR+)

Always

Below 1 Ω

j1-2 (RR+) or j5-1 (RR+) - Body ground and other terminals

Always

10 kΩ or higher

j1-1 (RR-) - j5-3 (RR-)

Always

Below 1 Ω

j1-1 (RR-) or j5-3 (RR-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE RH NO. 1

OK

17.

INSPECT REAR SKID CONTROL SENSOR WIRE RH 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 RH No. 2

*b

(to Sensor Side Connector)

*c

(to Vehicle Side Connector)

(b) Disconnect the T7 rear skid control sensor wire RH 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

j5-1 (RR+) - T7-2 (RR+)

Always

Below 1 Ω

j5-1 (RR+) or T7-2 (RR+) - Body ground and other terminals

Always

10 kΩ or higher

j5-3 (RR-) - T7-1 (RR-)

Always

Below 1 Ω

j5-3 (RR-) or T7-1 (RR-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPLACE REAR SKID CONTROL SENSOR WIRE RH NO. 2

OK

18.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE RH 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

T7-2 (RR+) - A41-20 (RR+)

Always

Below 1 Ω

T7-2 (RR+) or A41-20 (RR+) - Body ground

Always

10 kΩ or higher

T7-1 (RR-) - A41-19 (RR-)

Always

Below 1 Ω

T7-1 (RR-) or A41-19 (RR-) - Body ground

Always

10 kΩ or higher

HINT:

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

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

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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