Hyundai i-30: ISG (Idle Stop & Go) System / Repair procedures

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / ISG (Idle Stop & Go) System / Repair procedures

Operating Condition for the ISG function
1. Auto stop or Auto start condition
▶ If all of the below conditions are satisfied
  
If the following conditions are not met, entry into the ISG system is prohibited.
Component
Conditions
Remark
AT
MT
ISG OFF Switch
OFF
OFF
ISG OFF switch indicator lamp ->OFF
Drive door / Seat belt / Hood
Closed
Closed

Gear state
D range or N range
Neutral
When gear is shifted to R, entry into the ISG system is prohibited.
Brake pedal
ON (Auto Stop) / OFF (Auto Start)
-

Clutch pedal
-
OFF (Auto Stop) / ON (Auto Start)

Vehicle speed
When entering below 0 kph after driving above 5 kph.
When entering below 5 kph after driving above 10 kph.
Idle stop is possible when shifting the gear from D to N after stopping (allowed only once)
A/C System
When conditions of full auto air conditioner/manual air conditioner are satisfied
When conditions of full auto air conditioner/manual air conditioner are satisfied
Outside temperature is within -20 ~ 50 degrees
MDPS
Within 180 degrees
No limit

RR Defogger switch
Gasoline : OFF / Diesel : irrelevant
Gasoline : OFF / Diesel : irrelevant

Battery (Charge / discharge)
Over SOC 68%
Over SOC 68%

Engine Coolant Temperature
Gasoline : 70 ~ 75°C / Diesel : 20 ~ 30°C
Different depending on the region and vehicle model
Ambient pressure
Over 750hPa
No limit

Slope
From -5 to 12% (some SUV's are from -5 to 8%)
No limit

 ECM / TCM
When conditions (temperature, DTCs, OBD diagnosis, etc.) are satisfied
In case of diesel, ISG operation is prohibited when regenerating the DPF.
ISG system error
No occurred


  
In congested areas, if the driver wishes to stop the vehicle and change lever from D→N, the ignition will turn OFF.
2. Conditions for forced restart (If none of the below condition is not satisfied)
Component
Conditions
Remark
AT
MT
A/C System (Blower Max)
ON
ON
If more than 5/8, it is judged as max
RR Defogger switch
ON
ON

Comfortable
Full auto air conditioner/manual air conditioner request
Full auto air conditioner/manual air conditioner request
Based on the evaporator temperature and time
Battery voltage
If the charge/discharge performance are not satisfied
If the charge/discharge performance are not satisfied
Different depending on the region and vehicle model
Brake vacumm
Over -35 kPa
Over -35 kPa

Vehicle speed
Over 1.5 kph
Over 6 kph

Seat / Door
When opened during brake pedal On.
None (The message is displayed on the instrument cluster)
Ensuring safety
Hood
Engine start with key when the hood is opened
None (The message is displayed on the instrument cluster)
When operating the brake and accelerator simultaneously
Engine is restarted immediately
-
ISG OFF Switch
Engine is restarted immediately
-


  
When the battery negative (-) terminal is disconnected, the battery sensor is deactivated. So, after reinstalling the battery sensor, make sure to activate it.
The battery sensor is activated when the vehicle is left in parking status for about 4 hours after battery negative (-) terminal is connected to the battery.
Even if the battery sensor is deactivated, the ISG may operate restrictively but for normal ISG operation, the battery sensor must be activated.
  
ISG system deactivation by fault.
Fault in communication line (LIN/CAN)
Fault Brake switch
Fault brake booster vacuum pressure sensor
When starter motor needs to be replaced as its life has ended due to the use of ISG for a long period of time
As stated above, if the sensors and parts related to the ISG are faulty or system error occurs, the ISG indicator (yellow) will blink for 5 seconds then remains ON and the message "Check Engine Auto Stop System" is displayed on the instrument cluster. At this time, the ISG OFF switch indicator turns ON.
Especially, when the battery sensor is reinstalled after replacing or removing it, ISG system will operate normally as battery sensor becomes normal after the vehicle is left in parking status for about 4 hours.
However, when keeping the ignition switch OFF condition after extracting the key, power lines of all the personal electrical devices (ex: navigation, black box, etc) must be disconnected other than the standard electrical devices installed in assembly line.
(However, it may take a long time depending on the vehicle condition)
  
Before leaving the car or doing anything in the engine room area, stop the engine by turning the ignition key to the LOCK position or removing it.

    Schematic diagrams

    Schematic Diagram    • The ISG system is strongly networked with the power management...

    Fuel Delivery System

    ..

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