Kia Stinger: Engine Control / Fuel System / ISG (Idle Stop & Go) System

Kia Stinger CK 2018-2020 Service Manual / Engine Control / Fuel System / ISG (Idle Stop & Go) System

Components and components location
Components Location

1. Battery sensor
2. Brake Booster Vacuum Pressure Sensor (BBVPS)
3. AGM battery
4. DC/DC Converter [200W]
5. DC/DC Converter [400W]
6. ISG OFF Switch
7. Alternator
8. Starter
9. Brake switch
10. Door switch
11. Seat belt switch
12. Hood switch

1. Battery sensor
3. AGM battery
2. Brake Booster Vacuum Pressure Sensor (BBVPS)

4. DC/DC Converter [200W]
5. DC/DC Converter [400W]

6. ISG OFF Switch
7. Alternator

8. Starter
9. Brake switch

10. Door switch
11. Seat belt switch

12. Hood switch



Description and operation
Description

Idle Stop & Go (ISG) system switches off the ignition when vehicle is stopped, and then restarts the ignition and starts the vehicle when accelerator is pushed. It temporarily stops the engine while waiting for signal or idling to improve fuel efficiency and reduce exhaust gas emission. However, ISG system may not operate if engine oil or ambient temperature is too low, or if 12V battery voltage is too low. The system can be deactivated by pushing the ISG OFF switch when the driver wishes not to use ISG system.

Operation
Non - M/T

How to use:

1)

Engine Auto-Stop: D-range + brake pedal is pressed.

2)

Engine Auto-Start

(1) Brake pedal is released.

(2) Brake pedal is pressed + Manual range (Sports mode)

(3) Brake pedal is pressed + R range

1.

Vehicle moving.

2.

The transmission lever is in D. The brake pedal is released.

3.

The engine is running. (Vehicle is moving.)

4.

The driver brakes until the vehicle comes to a standstill.

5.

The transmission lever is in D. The brake pedal is pressed.

6.

The engine stops. The symbol "AUTO STOP" lights up in the instrument cluster.

7.

The driver wants to continue the journey.

8.

The transmission lever is in D. The brake pedal is released.

9.

The engine is running again. The symbol "AUTO STOP" goes out.

Schematic diagrams
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 vacumm
Below -35kPa
 
 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 78% Temperatuere:2-55°C(35.6 - 131°F)]
Satisfied
 
 ISG related part error
Does not occur
 
 Vehicle speed
Entry the below 0kph 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 (Neutal)/ D
Engine auto stop condition
R/ 1/ 2
Engine auto stop condition

  

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 swtich
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 vacumm
Over -35kPa
 
A/C State
Dissatisfied
 
Battery sensor
(SOC: Over 78%, 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. onditions for forced restart (If none of the below condition is not satisfied)

Component
Conditions
Remark
Safety requirements
Low pressure for braking system
Over -35kpa
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

  

In case of error during idle stop, the engine can only be started by using the key.

  

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.

  

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.

  

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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