Hyundai Ioniq: Hybrid Control System / Description and operation

Hyundai Ioniq (AE) 2017-2025 Service Manual / Hybrid Control System / Description and operation

Hybrid Electric Vehicle (HEV)

The Hybrid Electric Vehicle (HEV) uses hybrid power source (Engine, Electric motor), so its fuel efficiency is relatively high and exhaust emission is very small compared to the traditional vehicle which uses only engine as power source. It consists of the engine, motor, high voltage battery and control modules.
In Electric Vehicle (EV) mode, the HEV is driven by only the electric motor, but engine supports the motor in case the vehicle needs more power (HEV Mode).
The electric motor not only drives the vehicle but also generates electric energy during regenerative braking for charging the high voltage battery.

[HEV Operation Mode and Power Flow]

[Warning Lamp]

Items

Description

Related Control Module

1. MIL Lamp

•	Lamp ON : Engine Management System (EMS) fault

ECM, TCM, OPU, HCU, MCU, BMS, AAF

2. Service Lamp

•	Lamp ON : Hybrid related system fault

HCU, MCU, BMS, LDC, OPU

3. READY Lamp

•	After ignition START

–	Lamp ON : HEV in normal condition is ready to drive (Engine may or may not start)

–	Lamp OFF : HEV is not ready to drive

•	During driving

–	Lamp ON : HEV is ready to drive

–	Lamp Blinking : HEV in faulty condition (HEV in limited operating mode)

–	Lamp OFF : HEV is not ready to drive

HCU

4. EV MODE Lamp

•	Lamp ON : EV mode (Electric motor only)

•	Lamp OFF : HEV mode (Engine running)

HCU

Inspection mode procedures

Procedure for entering engine forced activation modeIf the engine needs to be running constantly while the vehicle is stopped to inspect emission gas or perform maintenance on the vehicle, follow below procedure to enter engine forced activation mode...

Specifications

SpecificationsHybrid Control SystemBrake Switch▷ Type : ON/OFF Switch▷ Specification Item Brake PedalRelease Brake PedalPush Switch 1Max...

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