Lexus ES manuals

Lexus ES: Left Rear Wheel Speed Sensor Signal Stuck Low (C050C23)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Left Rear Wheel Speed Sensor Signal Stuck Low (C050C23)

DESCRIPTION

Refer to DTC C050C12

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C23

Left Rear Wheel Speed Sensor Signal Stuck Low
  • When the vehicle is driven from 0 km/h to 12 km/h (0 mph to 7 mph), the wheel speed is 1.8 km/h (1.1 mph) or less for 0.6 seconds or more.
  • When the wheel speed has not exceeded 1.8 km/h (1.1 mph), the vehicle speed reaches 18 km/h (11 mph).
  • When the vehicle speed and wheel speed are both 43.2 km/h (26.8 mph) or more, the pulse signal is not detected for 0.08 seconds or more.
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)*1
  • Rear speed sensor LH*2
  • speed sensor installation

*1: for 2WD

*2: for AWD

DTC Detection Conditions: C050C23
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

The vehicle is driven from 0 km/h to 12 km/h (0 mph to 7 mph).

○

-

-

The vehicle speed reaches 18 km/h (11 mph).

-

○

-

The vehicle speed and wheel speed are both 43.2 km/h (26.8 mph) or more.

-

-

○

Malfunction Status

The wheel speed is 1.8 km/h (1.1 mph) or less.

○

-

-

The wheel speed has not exceeded 1.8 km/h (1.1 mph).

-

○

-

The pulse signal is not detected.

-

-

○

Detection Time

0.6 seconds or more.

-

0.08 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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  • DTC precaution

    Click here

    Procedure to clear warning lights (When not clearing DTCs)

    Procedure
    1. Repair or replacement.
    2. Turn the engine switch on (IG).
    3. Drive the vehicle at 2 km/h (1 mph) or more to clear the warning lights.

PROCEDURE

1.

CHECK FREEZE FRAME DATA (WHEEL SPEED)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

(d) Select a DTC to display the Freeze Frame Data.

(e) Read the freeze frame data of DTC C050C23.

Chassis > Brake/EPB

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Front wheel speed sensor RH reading

Min.: 0.0 km/h (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

FL Wheel Speed

Front wheel speed sensor LH reading

Min.: 0.0 km/h (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

RR Wheel Speed

Rear wheel speed sensor RH reading

Min.: 0.0 km/h (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

RL Wheel Speed

Rear wheel speed sensor LH reading

Min.: 0.0 km/h (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 > DTC(C050C23) > Freeze Frame Data

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

Result

Proceed to

The value of RL Wheel Speed is 2 km/h (1 mph) or less when all other values are 12 km/h (7 mph) or more.

A

The value of RL Wheel Speed is 2 km/h (1 mph) or less when all other values are 43 km/h (27 mph) or more. (for 2WD)

B

The value of RL Wheel Speed is 2 km/h (1 mph) or less when all other values are 43 km/h (27 mph) or more. (for AWD)

C
B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

C

GO TO STEP 3

A

2.

READ VALUE USING TECHSTREAM (RL 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

RL Wheel Speed

Rear wheel speed sensor LH 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

RL Wheel Speed

(d) Start the engine and perform a road test.

(e) Check that the value of RL Wheel Speed changes in accordance with vehicle speed when accelerating from 0 km/h to 20 km/h (0 mph to 12 mph).

OK:

The value of RL Wheel Speed changes in accordance with vehicle speed.

HINT:

If the result of the road test is within the specified range, it is possible that this DTC was stored due to a particular situation such as brake drag, wheelspin or wheel lockup.

Result

Proceed to

OK

A

NG (for 2WD)

B

NG (for AWD)

C
A

USE SIMULATION METHOD TO CHECK

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

C

GO TO STEP 3

3.

CHECK REAR SPEED SENSOR LH INSTALLATION

(a) Check the rear speed sensor LH installation.

OK:

There is no clearance between the rear speed sensor LH and the rear axle carrier LH.

The installation bolt is tightened properly.

Torque

8.5 N*m (87 kgf*cm, 75 in.*lbf)

*1

Rear Speed Sensor LH

*a

Correct

*b

Incorrect

*c

8.5 N*m

*d

No clearance
OK

REPLACE REAR SPEED SENSOR LH

NG

REINSTALL OR REPLACE REAR SPEED SENSOR LH

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