KIA Niro: Low Voltage DC/DC Converter (LDC)

Component Location

  1. Low Voltage DC/DC Converter (LDC) (HPCU)
  2. Low Voltage DC/DC Converter (LDC) power output terminal (+) (DC 12V)
  3. Low Voltage DC/DC Converter (LDC) ground terminal (-)

Schematic Diagram

Low Voltage DC/DC Converter (LDC) / Repair Procedures

Low Voltage DC/DC Converter (LDC) / Repair Procedures

Removal

Warning

  • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  • Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system.

    Failure to follow the safety instructions may result in serious electrical injuries.

  1. Shut off the high voltage.

    (Refer to "High voltage Shut-off Procedures")

  2. Remove the air cleaner assembly and air duct.

    (Refer to Engine Mechanical System - "Air Cleaner")

  3. Remove the ECM & TCM bracket assembly.

    (Refer to Engine Control/Fuel System - "Engine Control Module")

  4. Drain the coolant of hybrid motor cooling system.

    (Refer to Hybrid Motor Cooling System - "Coolant")

  5. Disconnect the motor power cable connector (A) and HSG power cable connector (B) after loosening the mounting bolts.

  1. Disconnect the power cable (A) and inverter power cable (B) from the HPCU.

Warning

Warning

Remove the inverter power cale in the follwing order.

  1. Disconnect the HCU & inverter (MCU) connector (A).

  1. Disconnect the coolant outlet hose & pipe after loosening the mounting bolt (A).

  1. Disconnect the coolant inlet hose quick-connector (A).

  1. Remove the LDC power outlet cable mounting bolt (A) and ground cable bolt (B).

  1. Remove the HPCU (A) after loosening the mounting bolts.

Installation

Installation

Warning

  • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  • Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system.

    Failure to follow the safety instructions may result in serious electrical injuries.

  1. Install the LDC in the reverse order of removal.
  2. Refill the hybrid motor cooling system coolant and perform air bleeding by using the KDS.

    (Refer to Hybrid Motor Cooling System - "Coolant")

Warning

Perform HCU Variant Coding and Engine Clutch / Motor Resolver learning after replacing the HPCU.

HCU Variant Coding

  1. Turn the ignition switch OFF.
  2. Connect the KDS to Data Link Connector (DLC).

    Turn the ignition switch ON.

  3. Select "Vehicle, Model year, Engine, System".
  4. Select "Vehicle S/W Management".
  5. Select "HCU Variant Coding".

Engine clutch/motor resolver adaptation

Engine clutch/motor resolver adaptation

  1. Turn the ignition switch OFF.
  2. Connect the KDS to Data Link Connector (DLC).

    Turn the ignition switch ON.

  3. Select "Vehicle, Model year, Engine, System".
  4. Select "Vehicle S/W Management".
  5. Select "Engine clutch/motor resolver adaptation.".

Hybrid Motor Assembly

    READ NEXT:

     Hybrid Motor Assembly

     Hybrid Drive Motor Assembly Repair procedures

    Description The hybrid motor system is equipped with two electric motors - HSG and drive motor. The traction motor operates to move the vehicle, to reduce Noise, Vibration, and Harshness (NVH) while driving and to improve fuel efficienc

     Hybrid Starter Generator(HSG) Repair procedures

    Hybrid Starter Generator(HSG) Components and components location Components Hybrid starter generator (HSG) HSG bracket Specification Hybrid Starter Generator(HSG) Repair procedures Inspection Inspect the line to line resistanc

    SEE MORE:

     Information on data processing

    Any processing of personal data through the 112-based eCall in-vehicle system shall comply with the personal data protection rules provided for in Directives 95/46/EC (1) and 2002/58/EC (2) of the European Parliament and of the Council, and in

     Front Seat Back Cover

    Front seat back cover Replacement Remove the front seat assembly. (Refer to Front Seat - "Front Seat Assembly") Remove the front seat outer shield cover. (Refer to Front Seat - "Front Seat Outer Shield Cover")

    Categories