Monitor GDS Data

Connect GDS to DLC(Data Link Cable).
Warm up the engine to normal operating temperature.
Monitor "FPS" parameter on GDS.

Fig 1: FPS Signal Waveform (At Acceleration And Deceleration)
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Display - Monitor "FPR" Parameter On GDS
Courtesy of KIA MOTORS AMERICA, INC.

Examine the fuel pressure checking the change of rail pressure and 'Angle to Close FPR' and 'Angle to Open FPR'.
Is the "FPS" parameter displayed correctly?
YES

Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

NO

Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.