Component Inspection

Check fuel rail pressure performance
1. IG "OFF".
2. Engine start.
3. Monitor signal waveform of fuel rail pressure sensor with accelerating and decelerating.
  Specification: the fuel rail pressure will be increased while accelerating the vehicle.
  
  Fig 1: Measuring Fuel Rail Pressure Sensor Signal Waveform
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured signal waveform normal?
  YES
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good fuel rail pressure sensor and check for proper operation. If the problem is corrected, replace fuel rail pressure sensor and go to "VERIFICATION OF VEHICLE REPAIR " procedure.