Hyundai Ioniq: Hybrid Control System / Description and operation

Hyundai Ioniq (AE) 2017-2024 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...

Other information:

Hyundai Ioniq (AE) 2017-2024 Owner's Manual: Stop vehicle to charge battery/ Park with engine On to charge battery, Refuel to prevent Hybrid battery damage

Stop vehicle to charge battery/ Park with engine On to charge battery Either message is displayed when the hybrid battery power (SOC) level is low. In this case, park the vehicle in a safe location and wait until the hybrid battery is charged. Refuel to prevent Hybrid battery damage This message is displayed when the fuel tank is nearly empty...

Hyundai Ioniq (AE) 2017-2024 Service Manual: Description and operation

Warning Lamp ActivationWarning Lamp Behavior after Ignition OnAs soon as the operating voltage is applied to the SRSCM ignition input, the SRSCM activates the warning lamp for a LED lamp check.The lamp shall turn on for 6 seconds during the initialization phase and be turned off afterward...