Lexus ES manuals

Lexus ES: Wheel Speed Sensor Signal Compare Failure (C124E62)

DESCRIPTION

The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from each speed sensor.

These signals are used for recognizing that all four wheels are operating properly.

Therefore, signals from all wheels must be equal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C124E62

Wheel Speed Sensor Signal Compare Failure

  • Abnormal pulse signals from 2 or more sensors.
  • Discrepancy among four wheel speed sensor output.
  • Tire wear
  • Tire pressure
  • Tire and wheel size
  • Skid control ECU (brake actuator assembly)
DTC Detection Conditions: C124E62
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

Abnormal pulse signals from 2 or more sensors.

-

Discrepancy among four wheel speed sensor output.

-

Detection Time

-

-

Number of Trips

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 the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.

    Click here

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

  • 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.

    Click here

  • 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 11 km/h (7 mph) or more for 1 second or more to clear the warning lights.

PROCEDURE

1.

CHECK DTC

(a) Connect the Techstream to the DLC3.

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

(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 the details of the DTCs.

HINT:

When DTC C05001C, C05061C, C050C1C and/or C05121C are output together with DTC C124E62, inspect and repair the trouble areas indicated by DTC C05001C, C05061C, C050C1C and/or C05121C first.

Result

Proceed to

C124E62 and C05001C, C05061C, C050C1C and/or C05121C are output simultaneously

A

C124E62 is output

B

A

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

B

2.

PRE-CHECK

(a) Check that all 4 tires are of correct size, are inflated to the correct pressure, and do not show excessive signs of wear.

Click here

HINT:

If a tire is deformed or an incorrectly sized tire or wheel is installed, this DTC may be stored.

NEXT

3.

CHECK FREEZE FRAME DATA (WHEEL SPEED AND VEHICLE 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 C124E62.

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

Vehicle Speed

Vehicle speed (vehicle speed used for each control)

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(C124E62) > Freeze Frame Data

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

Vehicle Speed

NEXT

4.

READ VALUE USING TECHSTREAM (WHEEL SPEED AND VEHICLE 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

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

Vehicle Speed

Vehicle speed

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

Vehicle Speed

Vehicle speed (vehicle speed used for each control)

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 > Data List

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

Vehicle Speed

Vehicle Speed

(d) Start the engine.

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

(f) Check the value of Wheel Speed and Vehicle Speed.

OK:

The value of each Wheel Speed and Vehicle Speed changes in accordance with vehicle speed and the maximum difference between any 2 sensors is less than 6%.

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.

Using to the freeze frame data, the approximate vehicle conditions that were present when the DTC was stored can be determined.

Click here

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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