Kia Rio: Charging System / DC/DC Converter
Description and operation
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.

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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.
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Components and components location

1. DC/DC converter (LHD)
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2. DC/DC converter (RHD)
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Schematic diagrams

Repair procedures
1. |
Disconnect the battery negative terminal.
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2. |
Remove the glove box housing.
(Refer to Body - "Glove Box Housing")
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3. |
Disconnect the DC/DC converter conector (A).
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4. |
Remove the DC/DC converter (B) after removing nuts.
DC/DC converter installation nut:
4.0 - 6.0 N·m (0.4 - 0.6 kgf·m, 3.0 - 4.4 lb·ft)
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[LHD]

[RHD]

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1. |
Install in the reverse order of removal.
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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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Specifications
Specification
▷ 13.5V, 90A
Item
Specification
Rated voltage
13.5V, 90A
Speed in use
...
Specifications
Specification
▷ AGM60L-DIN
Item
Specification
Capacity [20HR/5HR] (AH)
60/48
Cold Cranking Amp ...
Other information:
Engine oil and filter
The engine oil and filter should be changed at the intervals specified in the
maintenance schedule. If the vehicle is being driven in severe conditions, more
frequent oil and filter changes are required.
Drive belts
Inspect all drive belts for evidence of cuts, cracks, e ...
WARNING - Interior lamps
Prior to working on the Interior lamps, ensure that the “OFF” button is depressed
to avoid burning your fingers or receiving an electric shock.
1. Using a flat-blade screwdriver, gently pry the lens cover from lamp housing.
2. Remove the bulb by pulling it straigh ...