Hyundai Kona: ISG (Idle Stop & Go) System / Battery Sensor Description and operation

Description
Vehicles have many control units that use more electricity. These units control their own system based on information from diverse sensors. It is important to have a stable power supply as there diverse sensors giving a variety of information. Battery sensor is mounted on battery (-) terminal. It transmits battery voltage, current, temperature information to ECM. ECM controls generating voltage by duty cycle based on these signals.

  
When battery sensor signal fault occurs, inspect the vehicle parasitic draw in advance after inspecting the sensor because the sensor will behave abnormally when the parasitic draw is more than 100mA. (Refer to vehicle parasitic current inspection)
  
Perform the following process after replace the battery sensor.
Ignition switch ON/OFF.
Park the vehicle about 4 hours.
After 4 hours later, check the SOC (State of charge) of battery using GDS.
  
For the vehicle equipped with a battery sensor, be careful not to damage the battery sensor when the battery is replaced or recharged.
1)
When replacing the battery, it should be same one (type, capacity and brand) that is originally installed on your vehicle. If a battery of a different type is replaced, the battery sensor may recognize the battery to be abnormal.
2)
When installing the ground cable on the negative post of battery, tighten the clamp with specified torque of 4.0-6.0 N.m (0.4-0.6 kgf.m, 3.0-4.4 lb-ft). An excessive tightening torque can damage the PCB internal circuit.
3)
When recharging the battery, ground the negative terminal of the booster battery to the vehicle body.
Schematic diagrams
Operation Condition for the ISG function Operation Condition for the ISG function After every engine start, the function is automatically active and on stand-by. The ISG OFF ...

Battery Sensor Specifications
Specifications Item Specification Rated Voltage (V) 12 - 14 Quiescent Current (uA) Max. 175 ...

Other information:

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Hyundai Kona (OS) 2018-2021 Owners Manual: Instrument panel fuse replacement
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