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Home >> Hyundai >> 2019 >> Santa Fe SEL Plus, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Idle Stop & Go (ISG) System - 2.4L >> Schematic Diagrams >> Operating Condition For The ISG Function

Operating Condition For The ISG Function

  1. Auto stop or Auto start condition 
    • If all of the below conditions are satisfied
      Component State Remark
      ISG OFF Switch OFF ISG OFF switch indicator lamp -> OFF
      Engine Coolant Temperature Over 30°C (86°F)  
      Brake vacuum Below -35 kPa  
      Drive door, Seat belt, Hood Closed  
      EMS state (TPS/CKP/CMP/WTS/Vehicle speed signal) Satisfied DPF Regeneration prohibited
      A/C System Satisfied  
      Battery sensor [SOC: Over 68%, Temperature: 2 - 55°C (35.6-131°F)] Satisfied  
      ISG related part error Does not occur  
      Vehicle speed Entry the below 0 kph after Over 8kph Prohibition the ISG System before 8kph
      Accelerator pedal OFF Engine auto stop condition
      Brake switch ON Engine auto stop condition
      OFF Engine auto stop condition
      Gear state N (Neutral)/D Engine auto stop condition
      R/1/2 Engine auto stop condition
      NOTE:
      • In congested areas, if the driver wishes to stop the vehicle and change lever from D→N, the ignition will turn OFF.
  2. Restriction conditions for Auto stop or Auto start 
    • If one of the following conditions is met, the ISG system will not operate properly.
      Component Conditions Remark
      ISG OFF switch ON ISG OFF switch indicator state
      EMS State (TPS/CKP/CMP/WTS/Vehicle speed signal etc.) Dissatisfied DPF Regeneration prohibited
      Driver side door, seat belt, hood state Open  
      Brake vacuum Over -35 kPa  
      A/C State Dissatisfied  
      Battery sensor (SOC: Over 68%, Temperature: 2 - 60°C)) Dissatisfied  
      ISG system error Occurred  
      Steering wheel Greater the angle  
      A/C System A/C switch ON, FATC over 6, MTC over 3  
      Defrost Defrost switch ON  
      etc. Downhill, steep uphill  
      Operate the SPAS  
  3. Conditions for forced restart (If none of the below condition is not satisfied) 
    Component Conditions Remark
    Safety requirements Low pressure for braking system Over -35 kpa
    Low battery voltage Maintain excessive electrical load for 3 minutes
    Active defroster of front glass  
    Inertial speed over 1.5 km/h (on downhill)  
    Door open or driver side seat belt unfastened Brake Pedal Pressed
    Ignition switched ON with hood open  
    Engine stopped for long After 300 seconds
    Vehicle parted on a steep slope  
    Convenience requirements A/C ON, FATC over 6, MTC over 3 or HVAC performance dissatisfied  
    ISG OFF' button pressed  
  4. Restriction conditions for Auto-Stop operation 
    Conditions State Remark
    Driver side door, seat belt, hood state (Brake OFF state) Open Start by using "ignition switch" or "button start key" (only)
    CAN error (TCU, FATC/Cluster) Occurred
    EMS state (TPS/CKP/CMP/WTS/Vehicle speed signal) Dissatisfied
  5. ISG ON/OFF switch indicator state 
    Ref Symbol Description State Remark
    G13039537Courtesy of HYUNDAI MOTOR AMERICA
    		 AUTO STOP Green Symbol ISG ON switch indicator state
    G13039538Courtesy of HYUNDAI MOTOR AMERICA
    		 Yellow Symbol ISG OFF switch indicator state
    NOTE:
    • In case of error during idle stop, the engine can only be started by using the key.
    CAUTION:
    • The ISG system is strongly networked with the power management. In the event of battery replacement, disconnection of the battery terminal or after changing the engine management system, the reference data regarding the battery charge state and battery condition can be lost.
    • Battery sensor can be reactivated by parking for approximately 4 hours after connecting the negative (-) battery terminal to the battery.
    CAUTION: ISG system deactivation by fault.
    • Fault in communication line (LIN/CAN)

      Fault Electric oil pump

      Fault ESP System

      Fault Limp home mode

    • Fault brake booster vacuum pressure sensor

      Fault Brake master cylinder pressure sensor

      Fault Brake pedal switch

      Fault Battery sensor


    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 should operate properly in approximately 4 hours. However, for the first 25 times, the ISG function will operate regardless of recalibration.
WARNING:
  • When the engine is in idle stop mode, it can be restarted 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.
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