Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Right Rear Wheel Speed Sensor Circuit Short to Ground or Open (C051214)

DESCRIPTION

Refer to DTC C05121F.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C051214	Right Rear Wheel Speed Sensor Circuit Short to Ground or Open	An open in the speed sensor signal circuit continues for 0.5 seconds or more.	Rear speed sensor RH*1 Rear speed sensor RH (rear axle hub and bearing assembly RH)*2 Rear skid control sensor wire RH No. 1*2 Rear skid control sensor wire RH No. 2*3 Wire harness and connector Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

PROCEDURE

1.	READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(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 Speed Open	Rear speed sensor RH open detection	Under intermittent / Normal	Under intermittent: Momentary interruption detected Normal: Momentary interruption not detected	-

Chassis > Brake/EPB > Data List

Tester Display
RR Speed Open

(d) Select the line graph display.

(e) Check for any momentary interruption in the wire harness and connector.

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OK:

Normal (There are no momentary interruptions.)

NOTICE:

Perform the above inspection before removing the sensor and connector.

NG

GO TO STEP 5

OK

2.	READ VALUE USING TECHSTREAM (RR WHEEL SPEED)

(a) 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

(b) Start the engine.

(c) Perform a road test.

(d) 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.

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OK:

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

NG

GO TO STEP 5

OK

3.

CLEAR DTC

(a) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(b) Press the DTC clear button.

(c) Turn the engine switch off.

NEXT

4.	RECONFIRM DTC

(a) Start the engine.

(b) Perform a road test.

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result	Proceed to
DTC C051214 is not output.	A
DTC C051214 is output.	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

5.	CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result	Proceed to
w/o AVS (for AWD)	A
w/o AVS (for 2WD)	B
w/ AVS (for AWD)	C
w/ AVS (for 2WD)	D

B

GO TO STEP 8

C

GO TO STEP 11

D

GO TO STEP 14

A

6.	INSPECT 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.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

*a Front view of wire harness connector (to Rear Speed Sensor RH)

(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) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
T2-2 (RR+) - Body ground	Engine switch on (IG)	11 to 14 V

OK

REPLACE REAR SPEED SENSOR RH

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

8.	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

9.	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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

*a Front view of rear skid control sensor wire RH No. 1 (to Rear Speed Sensor RH (Rear Axle Hub and Bearing Assembly RH))

(b) Reconnect the Tj1 rear skid control sensor wire RH No. 1 connector.

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

OK:

The connector is securely connected.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
j1-2 (RR+) - Body ground	Engine switch on (IG)	11 to 14 V

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

REPLACE BRAKE ACTUATOR ASSEMBLY

11.	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

12.	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

13.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

*a Front view of rear skid control sensor wire RH No. 2 (to Rear Speed Sensor RH)

(b) Reconnect the T7 rear skid control sensor wire RH No. 2 connector.

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

OK:

The connector is securely connected.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
z22-1 (RR+) - Body ground	Engine switch on (IG)	11 to 14 V

OK

REPLACE REAR SPEED SENSOR RH

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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 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

15.	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

16.	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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT)

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

*a Front view of rear skid control sensor wire RH No. 1 (to Rear Speed Sensor RH (Rear Axle Hub and Bearing Assembly RH))

(b) Reconnect the j5 and T7 rear skid control sensor wire RH No. 2 connector.

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

OK:

The connector is securely connected.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
j1-2 (RR+) - Body ground	Engine switch on (IG)	11 to 14 V

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

REPLACE BRAKE ACTUATOR ASSEMBLY