SsangYong Korando III (2010 year). Manual - part 329

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2) Diagnostic Test for Engine Fuel System

(1) Overview

If a DTC is displayed on the diagnostic device, check the low pressure- and high pressure fuel systems 

before removing the components.

To run the system properly, the electric system must be intact but for the DI engine, the fuel pressure 

should be measured also when there is a malfunction even after the diagnostic test with a diagnostic 

device.

(2) Hydraulic system

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(3) Excessive backleak of injector

Excessive injector backleak

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Occurs when the injector control valve is not sealed due to the entry of the foreign materials.

Example:

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Entry of foreign materials

Burned out and worn HP pump

Mechanical damage inside the injector

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(4) Loss of pump pressure/flow

Loss of HP pump pressure/flow

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Faulty fuel supply line, or damaged or worn pump causes the lack of flow pressure and flow volume

Example:

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Air in fuel supply line
Excessive load on fuel supply line (←400 mBar)

Burned out and mechanical worn pump
High temperature of fuel supply (> 85℃)

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3) Pressure Test for Fuel System in DI Engine

(1) Test device (Tool kit)

Tool kit for high pressure line

Tool kit for low pressure line

(2) Pre-inspection

Connections in fuel supply line

Fuel level in fuel tank

Air in fuel supply line (air bubbles in fuel supply line or fuel)

Fuel leaks from fuel supply line (low/high pressure line)

Used the specified

Fuel filter contamination

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