Kia Picanto: ISG (Idle Stop & Go) System / DC/DC Converter

Kia Picanto JA 2017-2025 Service & Repair Manual / Engine Control / Fuel System / ISG (Idle Stop & Go) System / DC/DC Converter

Description and operation

Description

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 behind 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, rather is transferred directly to the outputs. In the booster phase, the vehicle voltage is adapted.

Operation Principle

•	In the ISG mode, if the power of an audio system turns OFF by drawdown while “Auto Starting” or “Idle Starting” function operates, replace the DC/DC converter.

Components and components location

Component Location

1. DC/DC converter

Schematic diagrams

Circuit Diagram

Repair procedures

Removal

1.	Turn ignition switch OFF and disconnect the battery negative (-) terminal.

2.	Remove the crash pad lower panel. (Refer to Body (Interior and Exterior) - "Crash Pad Lower Panel")

3.	Disconnect the DC/DC converter connector (A).

Remove the DC/DC converter (B) after removing the nut and scrow.

DC/DC converter installation nut :

4.0 - 6.0 N·m (0.4 - 0.6 kgf·m, 3.0 - 4.4 lb·ft)

Installation

After reconnecting the battery negative cable, ISG function does not operates until the system is stabilized, about 4 hours. If disconnecting the negative (-) battery cable from the battery during repair work for the vehicle equipped with AMS function, Battery sensor recalibration procedure should be performed after finishing the repair work.

1.	Install in the reverse order of removal.

AGM Battery

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ISG OFF switch

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