Hyundai i-30: Charging System / DC DC converter

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Electrical System / Charging 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.
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 [200W]
2. DC/DC converter [400W]

Schematic diagrams
Circuit Diagram
[200W]

[400W]

Repair procedures
Removal
[200W]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Disconnect the DC/DC converter connector (A).
3.
Remove the DC/DC converter (B) after removing the nuts.

[400W]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Remove the crash pad center lower cover.
(Refer to Body (Interior and Exterior) - "Main Crash Pad Assembly")
3.
Disconnect the DC/DC converter connector (A).
4.
Remove the DC/DC converter (B) after removing the nuts.

Installation
1.
Install in the reverse order of removal.
  
After reconnecting the battery negative cable, ISG function dose 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 ISG function, Battery sensor recalibration procedure should be performed after finishing the repair work.
(Refer to Charging System - "Battery Sensor")

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