SsangYong Korando III (2010 year). Manual — part 36
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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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