System Inspection

Visual Inspection
1. Check the air hose between MAFS and throttle body is torn or installation.
2. Check deformation, crack or installation of throttle valve (body)
3. Has a problem been found ?
  YES:
  - Substitute with a known-good Air hose or throttle body and check for proper operation.
    If the problem is corrected, replace air hose or throttle body and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO:
  - Go to " 2Check MAFS" as follows.
Check MAFS
1. IG "OFF" and install a scantool
2. ENG "ON" and monitor "MAFS" data on the service data.
3. Monitor signal waveform at signal terminal of MAFS with scantool.
  Specification : Signal waveform will be displayed as follows.
  
  (Be aware that the signal of MAFS is not voltage display but frequency display.)
  
  Fig 1: Signal Waveform Of MAFS At Idle
  Courtesy of HYUNDAI MOTOR CO.
  
  Fig 2: Signal Waveform Of MAFS At Acceleration
  Courtesy of HYUNDAI MOTOR CO.
4. Are both service data and signal wave form displayed correctly ?
  YES:
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO:
  - Substitute with a known - good MAFS and check for proper operation. If the problem is corrected, replace MAFS and go to "VERIFICATION OF VEHICLE REPAIR " procedure.