The ISG system is to reduce the fuel consumption by automatically shutting down the engine, when the vehicle is at a standstill (i.e. red stop light, stop sign, and traffic jam).
The engine is automatically started upon satisfying the starting conditions.
The ISG system is always active, when the engine is running.
Information
When the engine is automatically started by the ISGsystem, some warning lights (i.e. ABS, ESC, ESC OFF, EPS, and parking brake warning light) may illuminate for a few seconds due to the low battery voltage. However, it does not indicate a malfunction with the ISG system.
Hyundai Kona (OS) 2018-2021 Owners Manual: Emergency Stop Signal (ESS)
The Emergency Stop Signal system alerts the driver behind by blinking the stop
lights, while sharply and severely braking.
The system is activated when:
The vehicle suddenly stops. (The deceleration power exceeds 7 m/s2, and
the driving speed exceeds 55 km/h (34 mph).)
The ABS is activated and ...
Hyundai Kona (OS) 2018-2021 Service Manual: RCV Control Solenoid Valve Specifications
Specification
Item
Specification
Coil Resistance (Ω)
28.3 - 31.1 [20°C (68°F)]
...