Lexus ES: Right Rear Wheel Speed Sensor Circuit Intermittent (C05121F)

DESCRIPTION

Refer to DTC C051212

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C05121F	Right Rear Wheel Speed Sensor Circuit Intermittent	The speed sensor signal is excessively noisy. The calculated change in wheel speed is more than 980 m/s2 for 5*1 or 20*2 seconds or more. The calculated change in wheel speed fluctuates between more than 500 m/s2 and less than -500 m/s2 for 5*1 or 20*2 seconds or more. When the vehicle speed is low, excessive noise in the speed sensor pulse signal is detected 3 times or more within 0.005 seconds for 5*1 or 20*2 seconds or more.	Rear speed sensor RH (rear axle hub and bearing assembly RH)*3 Rear speed sensor RH*4 Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

DTC Detection Conditions: C05121F

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	The Stop light switch assembly is OFF.	-	○	○	○
Malfunction Status	The speed sensor signal is excessively noisy.	○	-	-	-
	The calculated change in wheel speed is more than 980 m/s2.	-	○	-	-
	The calculated change in wheel speed fluctuates between more than 500 m/s2 and less than -500 m/s2.	-	-	○	-
	The vehicle speed is low, excessive noise in the speed sensor pulse signal is detected 3 times or more within 0.005 seconds.	-	-	-	○
Detection Time		-	5 seconds or more.	5 seconds or more.	5 seconds or more.
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

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

DTC Detection Conditions: C05121F

		Vehicle Condition
		Pattern 5	Pattern 6	Pattern 7
Diagnosis Condition	The stop light switch assembly is ON.	○	○	○
Malfunction Status	The calculated change in wheel speed is more than 980 m/s2.	○	-	-
	The calculated change in wheel speed fluctuates between more than 500 m/s2 and less than -500 m/s2.	-	○	-
	The vehicle speed is low, excessive noise in the speed sensor pulse signal is detected 3 times or more within 0.005 seconds.	-	-	○
Detection Time		20 seconds or more.	20 seconds or more.	20 seconds or more.
Number of Trips		1 trip	1 trip	1 trip

HINT:

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

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK VEHICLE

(a) Check the vehicle specification.

Result	Proceed to
for 2WD	A
for AWD	B

A

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

B

2.	CHECK REAR SPEED SENSOR RH (CHECK FOR FOREIGN MATTER)

(a) Remove the rear speed sensor RH.

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(b) Check the rear speed sensor RH.

OK:

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

HINT:

If foreign matter of 1 mm x 1 mm or more is adhered to the rear speed sensor RH, this DTC may be stored.

NG

GO TO STEP 8

OK

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

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

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(b) Check the rear speed sensor rotor RH.

OK:

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

HINT:

If foreign matter of 1 mm x 1 mm or more is adhered to the rear speed sensor rotor RH, this DTC may be stored.

OK

REPLACE REAR SPEED SENSOR RH AND REAR AXLE HUB AND BEARING ASSEMBLY RH

NG

4.	CLEAN REAR SPEED SENSOR ROTOR RH

(a) Clean the rear speed sensor rotor RH.

NOTICE:

Do not use parts cleaner when cleaning the rear speed sensor rotor RH.

NEXT

5.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

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

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

NEXT

6.	PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK)

(a) Connect the Techstream to the DLC3.

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

(c) Using the Techstream, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete. Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.

Click here

Chassis > Brake/EPB > Utility

Tester Display
Signal Check

OK:

Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

NG

REPLACE REAR SPEED SENSOR RH AND REAR AXLE HUB AND BEARING ASSEMBLY RH

OK

7.	RECONFIRM DTC

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

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

Chassis > Brake/EPB > Trouble Codes

(e) Check if the same DTC is output.

Result	Proceed to
C05121F is not output	A
C05121F is output	B

A

END

B

REPLACE REAR SPEED SENSOR RH AND REAR AXLE HUB AND BEARING ASSEMBLY RH

8.	CLEAN REAR SPEED SENSOR RH

(a) Clean the rear speed sensor RH.

NOTICE:

When cleaning the rear speed sensor RH, make sure to clean the installation hole before installation.

NEXT

9.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

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

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

NEXT

10.	PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK)

(a) Connect the Techstream to the DLC3.

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

(c) Using the Techstream, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete. Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.

Click here

Chassis > Brake/EPB > Utility

Tester Display
Signal Check

OK:

Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.

NG

GO TO STEP 3

OK

11.	RECONFIRM DTC

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.

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

Chassis > Brake/EPB > Trouble Codes

(e) Check if the same DTC is output.

Result	Proceed to
C05121F is not output	A
C05121F is output	B

A

END

B

GO TO STEP 3

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