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: Compare actual waveform to those in SIGNAL WAVEFORM & DATA .
  
  Fig 1: Checking Signal Waveform Of Alternator
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Alternator Circuit Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured waveform within specification?
  YES
  - Go to " CHECK OPEN IN HARNESS" as follows.
  NO
  - Go to " CHECK SHORT IN HARNESS" as follows.
■ Check Open in harness
1. IG "OFF" and disconnect Alternator and PCM connector
2. Measure resistant between COM terminal of alternator and PCM harness connector.
  Specification: Below 1Ω
  
  Fig 3: Measuring Resistant Between COM Terminal Of Alternator And PCM Harness Connector
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 4: Alternator Circuit Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
3. Is the measured resistance within specification?
  YES
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  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: (2.) Approx. below 1Ω, (3.) Approx. 0V
  
  Fig 5: Measuring Resistance Between COM Terminal Of The Alternator Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 6: Alternator Circuit Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
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.
  NO
  - Repair short in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.