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Home >> Hyundai >> 2017 >> Accent Value Edition >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) >> DTC P0620: Alternator Control Circuit >> Component Inspection >> ECM Check
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ECM Check

  1. IG "OFF".
  2. Select "vehicle scope-meter" 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 

    • Go to "Alternator check" procedure below.

    NO 

    • Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair " procedure.
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