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

Hyundai Elantra (CN7) 2021-2026 Service Manual / Brake System / ESC (Electronic Stability Control) System / Rear Wheel Speed Sensor

Components and components location

Components
[Rear torsion beam disc brake type]

1. Rear wheel speed sensor
2. Rear wheel speed sensor connector

[Rear multi link disc brake type]

1. Rear wheel speed sensor
2. Rear wheel speed sensor connector

[Rear drum brake type]

1. Rear wheel speed sensor
2. Rear wheel speed sensor connector

Repair procedures

Removal
[Rear torsion beam disc brake type]
1.
Loosen the wheel nuts slightly.
Raise the vehicle, and make sure it is securely supported.
2.
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).

3.
Remove the rear brake caliper.
(Refer to Brake System - "Rear Disc Brake")
4.
Remove the rear brake disc (A).
Tightening torque :
4.9 - 5.9 N.m (0.5 - 0.6 kgf.m, 3.6 - 4.3 lb-ft)

5.
Disconnect the rear wheel speed sensor connector (A).

6.
Remove the hub bearing assembly (A) after loosening the mounting bolts.
Tightening torque :
49.0 - 58.8 N.m (5.0 - 6.0 kgf.m, 36.2 - 43.4 lb-ft)

[Rear multi link disc brake type]
1.
Loosen the wheel nuts slightly.
Raise the vehicle, and make sure it is securely supported.
2.
Remove the rear wheel and tire (A) from the rear hub.
Tightening torque :
107.9 - 127.5 N.m (11.0 - 13.0 kgf.m, 79.6 - 94.0 lb-ft)
   
•
Be careful not to damage the hub bolts when removing the rear wheel and tire (A).

3.
Remove the rear brake caliper.
(Refer to Brake System - "Rear Disc Brake")
4.
Remove the rear brake disc (A) after loosening the mounting screw.
Tightening torque :
4.9 - 5.9 N.m (0.5 - 0.6 kgf.m, 3.6 - 4.3 lb-ft)

5.
Disconnect the rear wheel speed sensor connector (A).

6.
Remove the hub bearing assembly after loosening the hub bearing mounting bolts (A).
Tightening torque :
88.3 - 107.9 N.m (9.0 - 11.0 kgf.m, 65.1 - 79.6 lb-ft)

[Rear drum brake type]
1.
Loosen the wheel nuts slightly.
Raise the vehicle, and make sure it is securely supported.
2.
Remove the rear wheel and tire (A) from the rear hub.
   
•
Be careful not to damage the hub bolts when removing the rear wheel and tire (A).

3.
Disconnect the rear wheel speed sensor connector (A).

4.
Loosen the screw and then remove the rear drum brake (A).

5.
Loosen the hub mounting bolts and then remove the hub (A) from the torsion beam.

Replacement
1.
Remove the rear wheel hub bearing assembly.
(Refer to Driveshaft and Axle - "Rear Hub - Carrier")
2.
Fix the rear hub bearing assembly (A) on the vise.
   
•
When fixing on the vise, use a cloth not to be damaged the hub bearing assembly.
•
Be careful if excessive force for fixing on the vise may damage the hub bearing assembly.

3.
Check the direction of the sensor cap (A).

4.
Remove the sensor cap by hammering on a gap between sensor cap and hub bearing assembly using a scraper (A).

   
•
In order to widen the gap little by little, hammering around the bearing cap 10-20 times.

•
When removing the sensor cap, remove it in a straight direction not to damage the tone wheel or encoder.

5.
Check if distorted or damaged the tone wheel or encoder (A).

   
•
Check if damaged the tone wheel or encoder after removing the sensor cap and replace the hub bearing if it was deformed.
•
If the tone wheel is deformed, it may trigger the MIL ON or other problems.

6.
Position the sensor cap to the same direction of sensor cap connector (A) as you checked before removing.

   
•
Before installing the sensor cap, do not let any foreign material and contaminant into the hub bearing (A) assembly.

7.
Install the sensor cap (A) with the special service tool (09527-AL300).

   
•
Hammer until there is no gap between the SST and hub bearing assembly and install the sensor cap.

•
Be careful not to tilt to one side when installing the sensor cap as it may damage the tone wheel or encoder.
•
When sensor cap installation, hammering it until the gap disappeared between the sensor cap and hub bearing assembly.

8.
Install the rear wheel hub bearing assembly.
(Refer to Driveshaft and Axle - "Rear Hub - Carrier")
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 : 1 - 2,500 Hz

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