Remove the rear wheel and tire.

Remove the rear wheel speed sensor mounting bolt (A).

Disconnect the rear wheel speed sensor connector (A) after remove the lock spring (B).

Remove the rear brake drum after removing a screw.

Remove the rear hub & carrier assembly (A) by loosening the mounting bolts.

Measure the output voltage between the terminal of the wheel speed sensor and the body ground. And then compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage as shown below.