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Home >> Hyundai >> 2018 >> Elantra GT Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 2.0L (3 Of 3) >> DTC P0620: Alternator Control Circuit >> Component Inspection >> Check ECM/PCM performance

Check ECM/PCM performance

  1. IG "OFF".
  2. Select "Vehicle scopemeter" in the menu, and connect channel A of GDS with FR terminal of Alternator harness connector.
  3. Connect Channel B of GDS with C terminal of Alternator harness connector.
  4. Engine start. And check the signal waveforms. (Compare the signal waveform of electrical loads ON with OFF)

    Specification  : Refer to SIGNAL WAVEFORM & DATA 

  5. Is the measured signal waveforms of Alternator normal?

    YES 

    NO 

    • Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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