Component Inspection

Check A/C pressure sensor
1. IG "OFF" and connect the GDS.
2. Connect the probe to A/C pressure sensor signal and select the oscilloscope in the menu.
3. Check the waveform with turning on and off a/c switch after engine start.
  Specification: Refer to SIGNAL WAVEFORM & DATA
  
  Fig 1: Checking Waveform With Turning On And Off A/C Switch After Engine Start
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured waveform of A/C pressure sensor normal?
  YES
  - Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good A/C pressure sensor and check for proper operation. If the problem is corrected, replace A/C pressure sensor and go to "VERIFICATION OF VEHICLE REPAIR " procedure.