Check Injector

Ignition "OFF".
Connect VMI to KDS/GDS and select "Oscilloscope".
Ignition "ON".
Measure signal waveform between Pin No. 1 (High) terminal of Injector #1 Joint (CC22) connector and chassis ground with VMI.
Measure signal waveform between Pin No. 4 (Low) terminal of Injector #1 Joint (CC22) connector and chassis ground with VMI.
Specification: Refer to Fig 1

Fig 1: Scantool Display - Normal Waveforms Of Injector At Engine Idle
Courtesy of KIA MOTORS AMERICA, INC.
Does the Injector #1 operate properly? (Check variation)
YES
- Go to "Verification Of REPAIR " procedure.
NO
- Carefully re-do this troubleshooting guide steps.
- If no problems were found with the circuits or connectors, replace the Injector #1 and go to "Verification Of REPAIR " procedure.