Kia Forte: Operation Condition for the ISG function

Second generation YD (2014-2018) / Kia Forte TD 2014-2018 Service Manual / Engine Control / Fuel System / ISG (Idle Stop & Go) System / Operation Condition for the ISG function

1. Auto stop or Auto start condition (If all of the below condition are satisfied)

Items		State	Remark
Driving conditions	ISG OFF Switch	off
	Switch (seat/door/hood)	Closed
	Lever position	D or N range	Prohibit operation on gear ‘P, R’
	Brake pedal	Pressed	Auto Stop
	Brake pedal	Released	Auto Start
	Vehicle speed	Vehicle speed = 0 Mph	After driving higher than 8kph (5 Mph)
	Air conditioning system	Ambient temperature is between -2 ~ 35 °C (28.4 ~ 95 °F)
	Engine Coolant Temperature (ECT)	Over 78 °C (172.4 °F)
	Brake Pressure	Below -35kpa
Battery conditions	SOC	Over 77%	To protect Battery
Battery conditions	Temperature	2 ~ 55 °C (35.6 ~ 131 °F)
Steering wheel	Operating angle	Below 180°
Parking condition	Slope	Up hill <12%, Down hill < 8%
ISG related part error		Sensor Error	Brake Booster Pressure Sensor
			Brake Master Cylinder Pressure
			Sensor, Brake Pedal Sensor,
			APS, Battery Sensor
		Related System Error	TM Electronic Auxiliary Pump
			ESC System Defect Mode
			CAN Communication Error
			Engine Limp Home Mode

2. Forced re-start conditions (If any of the below condition is not satisfied)

Component	Conditions	State	Remark
Conditions for safety	Low pressure for braking system	Over -35kpa
	Low battery voltage	Below 12.1V for 180 sec
	Active defroster of front glass	On
	When inertial speed reach 1Mph with (down hill)	Over 1Mph (Kph)	Inertial Speed
	Open the door or unfasten driver’s seat belt	Open	Brake Pedal Pressed
	Elapsed much of stop time
	On the steep slope way
Conditions for convenience	Turn on the air-conditioner or max blower speed or bad performance of air conditioning and heating
Conditions for convenience	Active ‘ISG OFF’ button
Sign of forced auto re-start	Blinking of lamp for 5 second and indicating on cluster

3. Restriction conditions for Auto-Stop operation

※ To protect system and safety auto-stop system is restricted below the conditions

Large steering angle when car is stop

Low brake operating pressure

Turn on the air conditioner with max blower

When battery Condition is poor (low SOC)

Active defroster of front or rear glass

Unfasten driver’s seat belt or open the door and hood

On the steep slope way

With ISG system errors, and other diagnosis

4. Restriction condition for auto Re-Start operation

Open hood (have to restart by key for repairman’s safety )

5. Restriction condition for OBD Check & Emission control

Auto Stop system will be limited	During Canister purge monitoring
Auto Stop system will be limited	During OBD check
To restrict continuous Cranking (for Emission Control)	Start Motor can operate for two seconds at the longest (just once)

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.

ISG system deactivation by fault.

-	Fault in communication line (LIN/CAN) Fault Electric oil pump Fault ESC 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 is operated about 4 hours later normally. But in the case of first 25 times, the ISG function can be operated regardless of recalibration.

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.

Operation

1. Vehicle moving. 2. The transmission lever position is D-range. The brake pedal is released. 3. The ...

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. Brake switch ...

Kia Forte: Operation Condition for the ISG function

Operation

Components Location

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