Repair procedures: Inspection

WARNING: This page is about a different car, the 2014 Hyundai Elantra GT and 2013 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.

Check the continuity between the terminal and the body with an ohmmeter.
If there is no continuity, replace the oil pressure switch.

Fig 1: Checking Continuity Between Terminal And Body Using Ohmmeter
Courtesy of HYUNDAI MOTOR AMERICA
Check the continuity between the terminal and the body when the fine wire is pushed. If there is continuity even when the fine wire is pushed, replace the switch.
If there is no continuity when a 50 kPa (0.50 kgf/cm² , 7.25 psi) is applied through the oil hole, the switch is operating properly.
Check for air leakage. If air leaks, the diaphragm is broken. Replace it.

Fig 2: Checking Continuity Between Terminal And Body
Courtesy of HYUNDAI MOTOR AMERICA