19-FL-002H

GROUP
NUMBER
FUEL SYSTEM
Technical Service Bulletin
SUBJECT:
DATE
19-FL-002H
MODEL(S)
MARCH, 2019
SANTA FE (TM)
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
Description: This bulletin describes the Santa Fe (TM) Idle Stop and Go (ISG) system operations and
battery sensor recalibration procedure. Refer to applicable Work Shop Manual and Owner’s Manual for
additional information.
Applicable Vehicles: Santa Fe (TM) with Idle Stop and Go (ISG) System
System Operation:
The Idle Stop and Go (ISG) system automatically and temporarily shuts down the engine when vehicle
is stopped and idling to improve fuel efficiency and reduce exhaust gas emissions. The ISG system
restarts the engine when the brake pedal is released or the accelerator pedal is depressed (if equipped
with Auto Hold feature and it is activated).
The ISG system is active whenever ignition is cycled to start the vehicle. Press the ISG OFF button to
deactivate the system.
Prerequisites for ISG System Activation:
 The driver’s seatbelt is fastened
 The driver’s door and the hood are closed
 The brake vacuum pressure is adequate
 The battery is sufficiently charged, State of Charge (SOC) is 70% or above
 The outside temperature is between 14 ~ 95oF (-10 ~ 35o C)
 The engine coolant temperature is over 86oF (30o C)
 The system is not in the diagnostic mode
 There are no related diagnostic trouble codes
 The vehicle is not on a steep slope
 Steering wheel is turned less than 180 degrees
 Shift lever is in DRIVE or NEUTRAL
NOTICE


The ISG system is not activated when the prerequisites to activate the ISG
system are unsatisfied. In this case, the orange color Auto Stop symbol is
illuminated in the instrument cluster when the vehicle comes to a stop and the
“ISG OFF” button indicator in the center console illuminates or flashes
depending upon the ISG system version.
Vehicle speed must reach at least 5 MPH in order for the ISG to activate again
after the previous stop.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
Illustrations below demonstrate ISG system operations.
1. Vehicle is moving.
2. Shift lever is in DRIVE.
Brake pedal is released.
3. Engine is running.
4. Driver brakes until the vehicle 5. Shift lever is in DRIVE.
is stationary.
Brake pedal is pressed.
6. Engine stops running.
Green color Auto Stop
symbol illuminates in the
instrument cluster.
7. Driver wants to continue the
journey.
9. Engine restarts and running.
Auto Stop symbol goes out.
8. Shift lever is in DRIVE.
Brake pedal is released.
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SUBJECT:
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
Auto Stop and Go Illuminations and Conditions
BATTERY SENSOR RECALIBRATION PROCEDURE
Auto Stop symbol illuminated Auto Stop symbol illuminated ISG Off button illuminated
in green color
in yellow color
 ISG prerequisites unsatisfied
 ISG activated
 ISG prerequisites unsatisfied  Idle Stop deactivated
 Engine stopped
 Engine running
 Battery sensor is recalibrating
 Engine running
Auto Stop symbol flashing in
green color
 ISG automatically restarted
 Engine running
Auto Stop symbol flashing in
yellow color
 ISG system malfunction
 Engine running
ISG Off button flashing
 Battery cable or sensor was
recently disconnected
 Battery sensor is recalibrating
 Engine stopped
Situations Engine May Automatically Restart:
 The climate control system blower fan speed is set above 6th position with air condition ON
 A certain period of time has elapsed with the air condition ON
 The defroster is activated
 The brake vacuum pressure is low
 The battery State of Charge (SOC) is below 70% threshold limit or battery is weak
 The vehicle is shifted to PARK or REVERSE when the brake pedal is depressed or the Auto
Hold is activated
 The driver door is opened or driver seat belt is unfastened when the brake pedal is depressed or
Auto Hold is activated
 The Electronic Parking Brake (EPB) is pressed when the Auto Hold is activated (if EPB is
equipped)
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SUBJECT:
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
!
WARNING


When the engine is in auto stop mode, the engine may restart on its own.
Never perform any work to the engine with the ignition in the “ON” or “ACC”
position as the engine may start without warning.
Before leaving the vehicle or checking the engine compartment, stop the engine
by pushing/turning the ignition switch to the OFF position and remove the key(s)
from the vehicle.

Battery Sensor
 Battery sensor which is mounted on battery negative (-) terminal transmits battery voltage,
current, and temperature information to Engine Control Module (ECM).
 ISG system utilizes Battery State of Charge (SOC), Battery State of Health (SOH) and other
battery data generated by battery sensor.
 Battery sensor requires approximately 4 hours of continuous connection with a battery to
generate stabilized data.
 Perform battery sensor recalibration procedure below after finishing any repair work if battery
cable or battery sensor was disconnected from battery or battery was recharged.
Battery Sensor Recalibration Procedure:
 Switch "ON" and "OFF" the ignition one time.
 Park the vehicle for a minimum of 4 hours with the hood and all doors closed.
Battery SOC and SOH data check procedure:
NOTICE
Perform the procedure only after the battery sensor recalibration procedure had been
followed and vehicle had been parked for over 4 hours.
1. Turn the ignition key to the ON position or
press the Start-Stop Button two times without
depressing the brake pedal. Connect a GDS
Mobile VCI-II to the vehicle data link
connector.
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SUBJECT:
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
2. Select “Data Analysis” within the GDS app.
BATTERY SENSOR RECALIBRATION PROCEDURE
3. Select “Engine”.
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SUBJECT:
IDLE STOP & GO SYSTEM OPERATION AND BATTERY SENSOR
RECALIBRATION PROCEDURE
4. Ensure that State of Charge of Battery (SOC)
and State of Health of Battery (SOH)
displays a percentage value.
5. If SOC or SOH displays the word “Checking”
instead of a percentage value, repeat battery
sensor recalibration procedure.
6. Verify the ISG system is operational again
when SOC, SOH and all the ISG operation
prerequisites are satisfied.
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