Hyundai Elantra (CN7): ESC (Electronic Stability Control) System / Front Wheel Speed Sensor

Hyundai Elantra (CN7) 2021-2025 Service Manual / Brake System / ESC (Electronic Stability Control) System / Front Wheel Speed Sensor

Components and components location

Components

1. Front wheel speed sensor
2. Front wheel speed sensor connector

Repair procedures

Removal
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).

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).

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)

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)

Installation
1.
To install, reverse the removal procedure.
Inspection
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.

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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