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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 65 (Automatic Transaxle System Diagnosis (HEV)) >> DTC P1784: EOP 3-Phase Wiring Line Open >> W/Harness Inspection >> Control Circuit Inspection

Control Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

■ Open Circuit Inspection 

  1. IG KEY "OFF".
  2. Disconnect "5pin of OPU" & "3pin of EOP" connector.
  3. Measure resistance between "U pin of 5pin connector of OPU" & "U pin of 3pin connector of EOP".
  4. Measure resistance between "V pin of 5pin connector of OPU" & "V pin of 3pin connector of EOP".
  5. Measure resistance between "W pin of 5pin connector of OPU" & "W pin of 3pin connector of EOP".

    Specification:  Approx. 0 Ω

    Fig 1: Measuring Resistance Between W Pin Of 5 Pin Connector Of OPU & W Pin Of 3 Pin Connector Of EOP
    G10603741Courtesy of HYUNDAI MOTOR AMERICA
    Fig 2: Identifying Oil Pump Unit Connector Terminals
    G10603742Courtesy of HYUNDAI MOTOR AMERICA
  6. Is the measured resistance within specifications?

    YES 

    • Go to "Short Circuit Inspection" procedure below.

    NO 

■ Short Circuit Inspection 

  1. Power circuit short inspection.
  2. Disconnect "connector of EOP side of Oil Pump Unit connector.
  3. Measure a resistance between "U, V, W phase oil pump unit and Battery power.

    Specification:  Infinite

    Fig 3: Measuring Resistance Between U, V And W Phase Oil Pump Unit And Battery Power
    G10603743Courtesy of HYUNDAI MOTOR AMERICA
    Fig 4: Identifying Oil Pump Unit Connector Terminals
    G10603744Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the measured resistance within specifications?

    YES 

    • Go to next step.

    NO 

■ Chassis Ground Short Inspection 

  1. Disconnect "Oil Pump Unit connector and PCM/TCM connector.
  2. Measure a resistance between "U, V, W phase oil pump unit and chassis ground.

    Specification:  Infinite

    Fig 5: Measuring Resistance Between U, V And W Phase Oil Pump Unit And Chassis Ground
    G10603745Courtesy of HYUNDAI MOTOR AMERICA
    Fig 6: Identifying Oil Pump Unit Connector Terminals
    G10603746Courtesy of HYUNDAI MOTOR AMERICA
  3. Is the measured resistance within specifications?

    YES 

    NO