KIA Niro: Electric Water Pump (EWP) Repair procedures


The Hybrid Power Control Unit (HPCU) uses various semiconductors that are supplied with high voltage, hence generating more heat than engine combustion devices. Overheating can decrease the efficiency of control devices, restrict proper operation and melt semiconductors in excessive heat, causing system failure. To prevent this, the hybrid system is equipped with a separate cooling system.



Electric Water Pump (EWP) Repair procedures

Electric Water Pump (EWP) Repair procedures


  1. Disconnect the negative (-) cable of the 12V battery.
  2. Remove the under cover.

    (Refer to Engine Mechanical System - "Engine Room Under Cover")

  3. Drain the coolant of hybrid motor cooling system.

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

  4. Separate the hose (A) from the reservoir.

  1. Separate the hose (A).

  1. Disconnect the EWP connector (A) and then remove the EWP after removing the bracket (B).

Tightening torque : 9.8 - 11.8 N*m (1.0 - 1.2 kgf*m, 7.2 - 8.7 lb*ft)

  1. Separate the hoses (A, B) from the EWP.



  1. Install in the reverse order of removal.


  • Be careful not to damage other hoses nearby when tightening the clamp.
  • Install the clamp in the specified direction to prevent interference with surrounding components.
  • Refill the hybrid motor cooling system with coolant and then perform the air bleeding using the KDS.

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

  • After installing, check for leakage of coolant or fluid from hose connection during engine start.


     Refilling And Bleeding

    Warning Never remove the cap when the engine is hot. Serious scalding could be caused by hot fluid under high pressure escaping from the reservoir. Warning When pouring inverter coolant, be sure to shut the relay box lid to prevent spilling c

     AHB(Active Hydraulic Boost) System

     AHB(Active Hydraulic Boost) System / Description And Operation

    Description Regeneration Brake System During deceleration or braking of an electric vehicle or HEV, the drive motor acts as an alternator and charges the battery by converting the vehicle's kinetic energy generated during braking into electrical


     Safety Plug Description and operation

    Description Safety Plug is installed on the rear side of the high voltage battery and it can mechanically shut the high voltage circuit off when servicing the high voltage system. (i.e. High Voltage Battery, Power Relay Assembly, HPCU, BMS ECU

     Using the Tire Mobility Kit

    Operation Shake the sealant bottle. Connect the filling hose onto the connector of the sealant bottle. (A) Remove the sealant bottle cap and sealant bottle holder cap and connect the bottle onto the sealant bottle holder. (B)