Control Circuit Inspection

■ Check waveform

IG "OFF" and connect GDS.
Connect probe to COM terminal to check control waveform by using oscilloscope function.
ENG "ON" and monitor signal waveform.
Specification: Compare actual waveform to those in Signal Waveform & Data .

Fig 1: Alternator Circuit Diagram
Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: Alternator Connector End View
Courtesy of HYUNDAI MOTOR AMERICA
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

IG "OFF" and disconnect Alternator and PCM connector
Measure resistant between com terminal of alternator and PCM harness connector.
Specification: Below 1Ω

Fig 3: Measuring Resistance Between COM Terminal Of Alternator And PCM Harness Connector
Courtesy of HYUNDAI MOTOR AMERICA

Fig 4: Alternator Connector End View
Courtesy of HYUNDAI MOTOR AMERICA
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

IG "OFF" and disconnect Alternator and PCM connector
Measure the resistance between com terminal of the alternator harness connector and chassis ground.
IG "ON" and measure the voltage between com terminal of the alternator harness connector and chassis ground.
Specification: (2.) Approx. below 1 Ω, (3.) Approx. 0V

Fig 5: Measuring Resistance Between COM Terminal Of Alternator Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA

Fig 6: Alternator Connector End View
Courtesy of HYUNDAI MOTOR AMERICA
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.