After every engine start, the function is automatically active and on stand-by. The ISG OFF switch can be used to deactivate the function manually until the next terminal change. Pressing the switch is confirmed by an lamp lighting up.
Conditions Required |
The engine coolant temperature is not too low (Over 45 degree). |
The Catalyst Converter temperature not too low (over 200 degree). |
Not inhibitor condition for operating strategy or engine fault - TPS, CKPS, CMPS, ECTS, VSS, Battery sensor, ISCA, BBVPS, Neutral Switch, Clutch Switch |
After fulfill OBD monitoring |
Battery charge status is adequately high. |
Not communication line error - LIN, CAN |
Vehicle speed less than 5kph |
Vehicle speed over 10kph at least once after key starting or idle starting |
ISG OFF switch off |
Driver’s seat belt and Driver’s Door and hood are closed. |
Battery temperature is between 2 to 60 degree. |
Brake booster pressure not to low. |
Not Blower max. |
Conditions Required |
Not inhibitor condition for operating strategy or engine fault - TPS, CKPS, CMPS, ECTS, VSS, Battery sensor, BBVPS, Neutral Switch, Clutch Switch |
Not communication line error - LIN, CAN |
Driver’s seat belt or Driver’s Door or hood are closed. |
Engine stalled, then changed gear position (engaged → neutral) and pressed clutch pedal. |
If error occurred in the idle stop status, it is possible to start the engine by the key only.
The engine will start automatically without the driver's action if any of the following occurs:
Conditions Required |
Not inhibitor condition for operating strategy - TPS, CKPS, CMPS, ECTS, VSS, Battery sensor, BBVPS, Neutral Switch, Clutch Switch |
Brake booster vacuum pressure is low. |
When the battery charge status is low. |
A certain amount of time has passed after the air conditioning is On. |
Vehicle speed is over 5kph by rolling down a hill. |
ISG system deactivation by fault
Fault in communication line (LIN/CAN)
Fault neutral switch
Fault brake booster vacuum pressure sensor
Fault clutch switch
When the ISG related sensors or system error occurs, the ISG OFF switch lights up.
Especially when the battery sensor is replaced or reinstalled, the vehicle must be placed in the ignition switch OFF for about 4 hours for recalibration.
The ISG function is operated about 4 hours later normally. But in the case of first 25 times, the ISG function can be operated regardless of recalibration.
When the engine is in Idle stop mode, it's possible to restart the engine without the driver taking any action.
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.
