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

Kia Picanto JA 2017-2024 Service & Repair 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
5 . ISG OFF switch
6. Alternator

7. Starter
8. Neutral switch
9. Clutch 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	5. ISG OFF switch

6. Alternator	7. Starter

8. Neutral switch	9. Clutch 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.

Sample scenario: switching off the engine at a standstill at a red traffic light or in a traffic with frequent stops.

1.	Vehicle is moving.

2.	Gear is engaged. The accelerator pedal is pressed.

3.	The engine is running.

4.	The driver brakes until the vehicle comes to a standstill.

5.	The driver engages neutral and releases the clutch pedal.

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

7.	The driver wants to continue the journey.

8.	The driver presses the clutch pedal. The engine starts.

9.	The gear can be engaged and the journey is continued. The symbol "AUTO STOP" goes out.

Schematic diagrams

Operating Condition for the ISG function

After every engine start, the function is automatically activated on stand-by. The ISG OFF switch can be used to deactivate the function manually until the next terminal change. The indication lamp lights up to confirm pressing of the switch.

1. Idle Stop (Idle → Stop) Condition

▶ Common Condition : Neutral Status & Clutch Pedal Released

Conditions Required

The engine coolant temperature is not too low (Over 45 degree).

No DPF regeneration

No inhibitor condition for operating strategy or engine fault

–	CKPS, CMPS, ECTS, VSS, Battery sensor, BBVPS, Neutral Switch, Clutch Switch, APS, Injector

Battery charge status is adequately high.

No communication line error - LIN, CAN

Vehicle speed is below 5 km/h

Vehicle speed is over 10 km/h at least once after key start or idle start

ISG OFF switch off

Driver side seat belt, driver side door and hood are closed.

Battery temperature is 2 - 55°C.

Brake booster pressure is not too low.

Blower not maximum

2. Idle Start (Stop → Start) Condition

▶ Common Condition : Neutral Status & Clutch Pedal Pressed

Conditions Required

Inhibitor condition for operating strategy not satisfied or engine fault

–	CKPS, CMPS, ECTS, VSS, Battery sensor, Neutral Switch, Clutch Switch, APS

No communication line error - LIN, CAN

Driver side seat belt, driver side door and hood are closed.

Engine stalled, gear position was switched from engaged to neutral and clutch pedal was pressed.

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

3. Auto-starting (Stop → Start) Condition

The engine will start automatically without the driver's action if any of the following occurs:

▶ Common Condition : Neutral Status & Clutch Pedal Released

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 5 km/h on a downward inclination.

Blower maximum

ISG system deactivated by fault

–	Faulty communication line (LIN/CAN)

–	Faulty neutral switch

–	Faulty brake booster vacuum pressure sensor

–	Faulty clutch switch

When the ISG related sensors or system error occurs, the ISG OFF switch lights up.

Especially, when the battery sensor has been replaced or reinstalled, the vehicle must be placed in ignition OFF for about 4 hours for recalibration.

The ISG function will operate normally after 4 hours.

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.

Troubleshooting

If the ISG function does not operate in spite of no DTC, inspect the ISG system as below.

The KDS shows the current data about the ISG function for inspection.

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