System Inspection

■ Check the fuel filter for blockage 

Remove the fuel pump and check filter debris and clogging of the fuel supply line.

■ Check the fuel level 

If you run out of fuel significantly on ramp, it may be a factor of degradation of the fuel pressure.

■ Check low-pressure fuel supply line leakage and blockage. 

Low-pressure fuel supply line damage and blockage can be a factor of the fuel pressure drop.

■ Check Fuel Pressure Regulator 

• Check Fuel Pressure Regulator performance by measuring voltage and current.

1. Back probe and measure voltage by using and connecting channel A (+) voltage probe to High side and channel A (-) voltage prove to Low side.
2. Measure operation current by using Low Current Sensor Module.
   Fig 1: Screen Display - Engine Idle After Warm Up

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 2: Screen Display - Fuel Rail Pressure Sensor (Approx. 2000RPM)

   Courtesy of KIA MOTORS AMERICA, INC.
3. Are all listed items normal?

   YES 

   • Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Recheck the listed items from this troubleshooting guide steps, and replace or repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.