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 |
|
|
| 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.
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-
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 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 |
|
| 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.
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HINT:
If a tire is deformed or an incorrectly sized tire or wheel is installed, this DTC may be stored.
|
| 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 |
| Tester Display |
|---|
| FR Wheel Speed |
| FL Wheel Speed |
| RR Wheel Speed |
| RL Wheel Speed |
| Vehicle Speed |
|
| 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 |
| 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.
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| OK | | USE SIMULATION METHOD TO CHECK |
| NG | | REPLACE BRAKE ACTUATOR ASSEMBLY |
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