Hyundai Ioniq (AE): Hybrid Motor Assembly / Description and operation
Hybrid motor system is equipped with two electric motors.
These motors include the drive motor and the HSG that plays the role of starter motor and alternator (generator).
The drive motor moves the vehicle, reduces the noise, vibration and harshness (NVH), and improves fuel efficiency.
The drive motor supplements the engine power when the driver press the accelerator pedal or when the vehicle is running in the fuel efficiency mode.
In addition, the drive motor plays the role of an alternator (generator) when decelerating or braking to charge the high-voltage battery.
The HSG performs restart/cold start of the engine while the vehicle is running, or charges the high-voltage battery.


Component location1. HPCU (Hybrid Power Control Unit)(LDC+MCU+HCU+Reservoir)2. Hybrid drive motor3. Hybrid starter generator (HSG)4. Electrical radiator5.
Other information:
Diagnosis With GDS1.The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).※ The diagnostic system (GDS) provides the following information.(1) Self diagnosis : Checking the failure code (DTC) and display.
Inspection1.Disconnect the negative (-) battery terminal.2.Remove the crash pad lower panel.(Refer to Body - "Crash Pad Lower Panel")3.Remove the lower crash pad switch assembly (A) after disengaging the mounting clip.4.Remove the rheostat switch connector (A).