Toyota Corolla Cross: 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*3 Rear speed sensor RH (rear axle hub and bearing assembly RH)*4 Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

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

CAUTION / NOTICE / HINT

NOTICE:

DTC precaution

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Procedure to clear warning lights (When not clearing DTCs)

Procedure
Repair or replacement. Turn the ignition switch to ON. 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.

HINT:

The rear speed sensor rotor RH and rear speed sensor RH are incorporated into the rear axle hub and bearing assembly RH. (for 2WD)

If the rear speed sensor rotor RH and rear speed sensor RH need to be replaced, replace them together with the rear axle hub and bearing assembly RH. (for 2WD)

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.

Click here

(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 (0.03937 in.) x 1 mm (0.03937 in.) or more is adhered to the rear speed sensor, 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 is free of oil and foreign matter.

HINT:

• If foreign matter of 1 mm (0.03937 in.) x 1 mm (0.03937 in.) or more is adhered to the rear speed sensor, this DTC may be stored.
• The rear speed sensor rotor 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.

OK

REPLACE REAR SPEED SENSOR RH AND REAR SPEED SENSOR ROTOR RH for rear speed sensor RH: Click here for rear speed sensor rotor RH: Click here

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.

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

(b) Turn the ignition switch off.

NEXT

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

(a) Using the GTS, 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.

Chassis > Brake/EPB > Utility

Tester Display
Signal Check

OK:

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

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.

NG

REPLACE REAR SPEED SENSOR RH AND REAR SPEED SENSOR ROTOR RH for rear speed sensor RH: Click here for rear speed sensor rotor RH: Click here

OK

7.	RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Check if the same DTC is output.

Chassis > Brake/EPB > Trouble Codes

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
C05121F is not output	A
C05121F is output	B

A

END

B

REPLACE REAR SPEED SENSOR RH AND REAR SPEED SENSOR ROTOR RH for rear speed sensor RH: Click here for rear speed sensor rotor RH: Click here

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) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

(b) Turn the ignition switch off.

NEXT

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

(a) Using the GTS, 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.

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) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Check if the same DTC is output.

Chassis > Brake/EPB > Trouble Codes

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

A

END

B

GO TO STEP 3

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