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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> HCU/Low Dc-Dc Converter Diagnosis (HEV) >> DTC P17EE: Engine Clutch System Functional Safety Fault >> System Inspection

System Inspection

  1. Remove the undercover below the vehicle and check the connector of the engine clutch actuator (HCA) for normal connection and corrosion.
    • If the connector is connected incorrectly, connect the connector correctly and check the system.
    • Check the connector terminal on the HCA for corrosion.
    • If the connector is connected correctly and there is no corrosion, carry out No. 2 item.
  2. Check as follows according to each failure status data.
    1. Inconsistency of software between the engine clutch HCU and the actuator
      • Check the Local CAN line and the HCA and replace the component that has an abnormality.
      • Check the actuator-related signal. If it is "0", it is a CAN failure occurring due to an HCA problem. Replace the HCA.
    2. Abnormal engine clutch releasing/abnormal engine clutch coupling
      • Check the engine clutch system (clutch cover, clutch disk, actuator, and hydraulic line, CSC) and replace the component that has an abnormality.
    3. Operation of engine clutch actuator disabled
      • This failure can occur when the vehicle voltage is low. Check if this failure occurs when the vehicle is left for several minutes in normal voltage status.
      • If no failure occurs in normal voltage status, no separate measures are necessary.
      • If a failure occurs in normal voltage status, check and replace the HCA if there is an abnormality.
    4. Engine clutch coupling failed
      • Check the HCA. If there is an abnormality, replace the component.
  3. After replacing it, it is necessary to carry out (1) final test line learning of the engine clutch and initialization of the diagnosis information → (2) Air bleeding from the hydraulic line of the engine clutch → (3) Engine clutch/motor resolver learning procedure in order using the GDS.

    * If the engine clutch cover and disk are not replaced, it is not necessary to carry out (1) stabilization of engine clutch hardware transfer torque.

    * In case the SOC is below 35%, when the shift gear is left at P in the ignition switch "ON"/HEV Ready status, the engine will operate and the SOC will be charged.

    * When carrying out air bleeding from the hydraulic line of the engine clutch after replacing the engine clutch system, the function will be carried out normally only when the temperature of the hydraulic oil (brake oil DOT 3) is at room temperature (over 20°C).

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