System Inspection

Check the air hose between MAFS and throttle body is torn or installation.
Check deformation, crack or installation of throttle valve(body)
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 "Check MAFS" as follows.

IG "OFF" and install a scantool
ENG "ON" and monitor "MAFS" data on the service data.
Monitor signal waveform at signal terminal of MAFS with scantool.
Specification: Signal waveform will be displayed as follows. Frequency will be increased during acceleration. (Be aware that the signal of MAFS is not voltage display but frequency display.)

Fig 1: Normal Waveform Of MAFS At Idle (640rpm & 13.0 kg/h)
Courtesy of HYUNDAI MOTOR CO.

Fig 2: Normal Waveform Of MAFS At Acceleration (2520rpm & 43.7 kg/h)
Courtesy of HYUNDAI MOTOR CO.
Are both service data and signalwave 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.