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

Kia Rio 2017-2020 YB 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
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.

Battery Sensor

The battery sensor perceives battery status. Battery status is a major influencing factor on the ISG function. Its main purpose is to ensure a reliable start of the combustion engine after a defined parking period from the perspective of the vehicle energy system.

The Battery sensor monitors the following data:

Battery charge condition

Battery temperature

Voltage dip on engine start

Brake Booster Vacuum Pressure Sensor

In order to ensure adequate brake power assistance in every situation, the brake booster is equipped with a partial vacuum sensor. The brake booster vacuum pressure sensor is located beside the brake booster.

  

With an excessively low brake particl vacuum, the ISG function is activated without any action on the part of the driver. Insufficient brake partial vacuum can lead to safety risks during braking manoeuvres when rolling on an inclination. To prevent this, the engine will be started.

AGM battery

In all cases, the ISG function comes with the intelligent alternator control. As vehicles equipped with ISG experience more frequent charge and discharge cycles, the load on the battery is very high. The cycle resistance of AGM batteries means that they achieve similar results with regard to service life despite the high load.

  

Ensure that an AGM battery is fitted.

In all cases, an AGM battery must be installed and registered in the vehicle for the ISG function to work perfectly.

DC/DC converter

Due to the considerably more frequent occurrence of starting operations, the electrical load that occurs often leads to voltage dips in the vehicle network. In order to stabilize the power supply for certain voltage-sensitive electrical components, a DC/DC converter is used in conjunction with the ISG function.

The DC/DC converter supplies the relay with a voltage that also remains constant during the starting operation.

The DC/DC converter is fitted at the back of the glove box.

Via the test leads for input voltage and the start relay , the electronics decide whether the power is supplied to the output via the bypass or the DC/DC converter.

In the bypass mode, the on-board supply voltage is not fed across the DC/DC converter and rather is transferred directly to the outputs. In the booster phase, the vehicle voltage is adapted.

ISG OFF Switch

The ISG OFF switch on the crashpad lower panel can be used to deactivate the ISG function.

Alternator

The battery discharge during the engine shutdown by the ISG function means that a more powerful alternator is installed.

Starter Motor

In conjunction with the ISG function, the starter motor must perform a great deal more work. The starter motor is therefore configured for a significantly higher number of start cycles. The components of the starter motor have been adapted to the higher requirements.

Neutral Switch

The neutral switch is mounted on top of the transmission case.

The neutral switch detects the idle position of the gearstick.

Clutch Switch

The present clutch switch is used as an input variable for the ISG function to detect clutch operation.

Seat Belt/door Switch (Driver)

By the seat belt/Door switch, the ISG function can detect if the driver has fastened the seat belt/closed the door. If the driver has not fastened the seat belt/closed the door, the ISG function will react as follows. If the seat belt is not fastened or a door is open, the engine will not start or stop by the ISG function for safety reasons.

Hood switch

The hood switch is one of the influencing factors of determining the activation of ISG function. If the hood is open, the engine will not start or stop by the ISG function for safety reasons.

  

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.

They are only available again a closed-circuit current measurement of approximate 4 hours in which the vehicle may not be wakened. In this time, the ISG system is inactive.

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
Troubleshooting

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

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

Engine Coolant Stop Solenoid Valve (ECSSV)
Specifications Specification Item Specification Coil resistance (Ω) 30.0 - 35.0 [20°C(68°F)] Pin ...

ISG OFF switch
Components and components location Components Description and operation Description The ISG OFF switch on the floor console can be used to deactivate the ISG function. ...

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