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Home >> Hyundai >> 2025 >> Kona SEL, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 2.0 (10 Of 15) >> DTC P0605-00: Internal Control Module Read Only Memory (ROM) Error >> DTC Inspection >> Inspection For PCM Power Circuit

Inspection For PCM Power Circuit

  1. Turn IGN switch ON.
  2. Check the PCM engine relay "ON" power terminal voltage value using a multi-tester.
  3. If the voltage is faulty, Inspection For wiring harness.
    List of Inspection Normal value Inspection Condition Probe (+) Probe (-)
    Engine Relay ON ←→ PCM supply power About 12V (battery voltage) 1. IGN Switch "ON" PCM Connector side
    1. Main relay "ON" power     		 Chassis Ground 
    Engine Relay ON ←→ PCM supply power PCM Connector side
    2. Main relay "ON" power     		 Chassis Ground 

Information 

Engine relay ON The faulty part according to the power cable inspection can be predicted as follows:

Measurement Result Possible Cause
When voltage is not output Wire break/"ECU1" fuse/"PCB-C" intermediate connector/PCB block needs to be checked
When output below the specified voltage Battery check/Wiring check required
At about 0V output Short to the wiring harness/ground (chassis)

OK 

Go to "Inspection For PCM Ground Circuit"  procedure.

NG 

Go to "Inspection For PCM Power Circuit Open/Short Circuit"  procedure.

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