Lexus ES: Left Rear Wheel Speed Sensor Circuit Intermittent (C050C1F)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Left Rear Wheel Speed Sensor Circuit Intermittent (C050C1F)

DESCRIPTION

Refer to DTC C050C12

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C050C1F	Left 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 51 or 202 seconds or more. The calculated change in wheel speed fluctuates between more than 500 m/s2 and less than -500 m/s2 for 51 or 202 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 51 or 202 seconds or more.	Rear speed sensor LH (rear axle hub and bearing assembly LH)3 Rear speed sensor LH4 Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

*1: The stop light switch assembly is OFF.
*2: The stop light switch assembly is ON.
*3: for 2WD
*4: for AWD

DTC Detection Conditions: C050C1F

		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: C050C1F

		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

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.
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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.
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DTC precaution
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Procedure to clear warning lights (When not clearing DTCs)
Procedure
Repair or replacement.

Turn the engine switch on (IG).

Drive the vehicle at 54 km/h (34 mph) or more for 3 seconds or more to clear the warning lights.

Procedure
Repair or replacement. Turn the engine switch on (IG). Drive the vehicle at 54 km/h (34 mph) or more for 3 seconds or more to clear the warning lights.

PROCEDURE

1.	CHECK VEHICLE

(a) Check the vehicle specification.

Result	Proceed to
for 2WD	A
for AWD	B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

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

(a) Remove the rear speed sensor LH.

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(b) Check the rear speed sensor LH.

OK:

The rear speed sensor LH 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 LH, this DTC may be stored.

GO TO STEP 8

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

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

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(b) Check the rear speed sensor rotor LH.

OK:

The rear speed sensor rotor LH 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 LH, this DTC may be stored.

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

4.	CLEAN REAR SPEED SENSOR ROTOR LH

(a) Clean the rear speed sensor rotor LH.

NOTICE:

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

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

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.

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Chassis > Brake/EPB > Utility

Tester Display
Signal Check

OK:

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

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

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
C050C1F is not output	A
C050C1F is output	B

END

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

8.	CLEAN REAR SPEED SENSOR LH

(a) Clean the rear speed sensor LH.

NOTICE:

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

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

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

(a) Connect the Techstream to the DLC3.

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

Click here

Chassis > Brake/EPB > Utility

Tester Display
Signal Check

OK:

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

GO TO STEP 3

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
C050C1F is not output	A
C050C1F is output	B

END

GO TO STEP 3

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Lexus ES: Left Rear Wheel Speed Sensor Circuit Intermittent (C050C1F)

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