Hyundai Sonata: ESP(Electronic Stability Program) System / Front Wheel Speed Sensor Repair procedures
1. |
Raise the vehicle, and make sure it is securely supported. |
2. |
Remove the wheel cap(A). 
Be careful not to damage to the wheel cap(A) when removing the it. |
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3. |
Remove the front wheel and tire (A) from front hub.
Tightening torque:
88.2 ~ 107.8 N.m (9.0 ~ 11.0 kgf.m, 65.0 ~ 79.5 lb-ft)
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Be careful not to damage to the hub bolts when removing the front wheel and tire (A). |
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4. |
Remove the front wheel speed sensor mounting bolt (A).
Tightening torque:
8.8 ~ 13.7 N.m (0.9 ~ 1.4 kgf.m, 6.5 ~ 10.1 lb-ft)
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5. |
Remove the front wheel speed sensor cable mounting bolt (A).
Tightening torque:
Shock absorber : 8.8 ~ 13.7 N.m (0.9 ~ 1.4 kgf.m, 6.5 ~ 10.1 lb-ft)
Body : 19.6 ~ 29.4 N.m (2.0 ~ 3.0 kgf.m, 14.5 ~ 21.7 lb-ft)
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6. |
Disconnect the front wheel speed sensor connector, then remove the front wheel speed sensor. 
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7. |
Installation is the reverse of removal.
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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 100 ? 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 : 1 ~ 2,500Hz
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Components
1. Front wheel speed sensor connector2. Front wheel speed sensor
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Components
1. Rear wheel speed sensor2. Rear wheel speed sensor cable
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