Control Circuit Inspection

Check waveform
1. IG "OFF" and connect GDS.
2. Connect probe to COM terminal to check control waveform by using oscilloscope function.
3. ENG "ON" and monitor signal waveform.
  Specification : Signal waveform will be displayed as Signal Waveform & Data.
  
  Fig 1: Checking Control Waveform
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured waveform within specification?
  YES
  - Go to " 2 Check Open in harness".
  NO
  - Go to " 3 Check Short in harness".
Check Open in harness
1. IG "OFF" and disconnect Alternator and PCM connector
2. Measure resistance between com terminal of alternator and PCM harness connector.
  Specification : Below 1Ω
  
  Fig 2: Measuring Resistance Between COM Terminal Of Alternator & PCM Connector
  Courtesy of KIA MOTORS AMERICA, INC.
3. Is the measured resistance within specification?
  YES
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others
  NO
  - Repair open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check Short in harness
1. IG "OFF" and disconnect Alternator and PCM connector
2. Measure the resistance between com terminal of the alternator harness connector and chassis ground.
3. IG "ON" and measure the voltage between com terminal of the alternator harness connector and chassis ground.
  Specification : Approx. below 1Ω, Approx. 0V
  
  Fig 3: Measuring Resistance/Voltage Between COM Terminal Of Alternator Connector & Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured resistance and voltage within specification?
  YES
  - Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NOTE: There is a memory reset function on GDS that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others
  NO
  - Repair short in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.