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HOMESERVICE MANUALSKIA2010FORTE EX, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (SULEV) (2 OF 2)DTC P0620: ALTERNATOR CONTROL CIRCUITINSPECTION/REPAIRCOMPONENT INSPECTION
2010 Kia Forte EX, Standard

Component Inspection

2010 Kia Forte EX, StandardSECTION Component Inspection
  • ECM (PCM) check 
    1. IG "OFF".
    2. Select "vehicle scopemeter" in the menu, and connect channel A of scantool with FR terminal of Alternator harness connector.
    3. Connect Channel B of scantool with C terminal of Alternator harness connector.
    4. Start engine and check the signal waveforms. (Compare the signal waveform of electrical loads ON with OFF)

      Specification  : Refer to SIGNAL WAVEFORM & DATA 

    5. Are the measured signal waveforms of Alternator normal?

      YES 

      • Go to "Alternator check" procedure.

      NO 

      • Substitute with a known-good ECM (PCM) and check for proper operation. If the problem is corrected, replace ECM (PCM) and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  • Alternator check 
    1. IG KEY "OFF".
    2. Check the tension of alternator belt.
    3. Check corrosion, damage or looseness of Battery terminal and Alternator terminal.
    4. Start engine.
    5. Operate electrical parts (Head Lamp, Defogger, etc) .
    6. Measure the voltage at 2000rpm.

      Specification  : Approx 12.5V ~ 14.5V

    7. Is the measured voltage within specification?

      YES 

      • Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. Check for poor connections, and check the related circuit between ECM (PCM) and component thoroughly. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO 

      • Substitute with a known-good Alternator and check for proper operation. If the problem is corrected, replace Alternator and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.