Hyundai Elantra: ESC (Electronic Stability Control) System / Front Wheel Speed Sensor
Components and components location

1. Front wheel speed sensor
| 2. Front wheel speed sensor connector
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Repair procedures
1. | Turn ignition switch OFF and disconnect the negative (-) battery cable. |
2. | Loosen the wheel nuts slightly. Raise the vehicle, and make sure it is securely supported. |
3. | Remove the rear wheel and tire (A) from the rear hub. •
| Be careful not to damage the hub bolts when removing the front wheel and tire (A). |
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4. | Remove the front wheel guard. (Refer to Body - "Front Wheel Guard") |
5. | Disconnect the front wheel speed sensor connector (A) and then remove the fixing clip (B). 
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6. | Remove the front wheel speed sensor cable braket bolt (A). Tightening torque : 7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft) |

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7. | Remove the wheel speed sensor (A) from the Knuckle after loosening the mounting bolt. Tightening torque : 7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb-ft) |

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1. | To install, reverse the removal procedure. |
1. | Measure the output voltage between the terminal of the wheel speed sensor and the body ground. •
| In order to protect the wheel speed sensor, when measuring output voltage, a 100Ω resister must be used as shown. |
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2. | Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage as shown below. 
V_low : 0.59V - 0.84V V_high : 1.18V - 1.68V Frequency range : 0.03 - 3,000 Hz |
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