SsangYong Rexton. Service manual — part 143
DI10-177
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DIAGNOSIS
DI ENG SM - 2004.4
FUEL SYSTEM DIAGNOSIS
OVERVIEW . . . . . . . . . . . . . . . .. DI10-178
Fuel pressure system . . . . . . . . . . . DI10-179
Fuel system pressure test . . . . . . . . .. DI10-182
Fuel system check process . . . . . . . . DI10-184
DI10-178
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DIAGNOSIS
DI ENG SM - 2004.4
OVERVIEW
When the Diagnostic Trouble Code (DTC) is detected through scan tool, it’s necessary to check the transfer and high
pressure fuel lines in fuel system before replacing the components.
If the trouble continues even after the trouble has been fixed with scan tool, must perform the fuel pressure test.
Below schematic diagram shows the specifications of pressure, flow mass and temperature in fuel system.
Y220_10062
FUEL SYSTEM DIAGNOSIS
Transfer fuel
pressure regulator
Pressure limit valve
(High pressure line)
Transfer pump
Supply
valve
Suction
valve
High pressure
pump
Up to
1600 bar
Common rail
Injectors
Fuel tank
Priming pump
Fuel filter
Venturi
Below 2 bar
Over - 0.48 bar
-0.6 ~ 0.1 bar
High pressure fuel
supply line
Transfer fuel supply line
Return line
DI10-179
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DIAGNOSIS
DI ENG SM - 2004.4
FUEL PRESSURE SYSTEM
Y220_10063
Pressure/Volume Consumption in System
Pressure/Volume Displacement from Pump
Injector back
leak volume
Fuel injection
volume
Pump capacity for
supplying the required
target pressure/volume
Conservation of fuel pressure/
volume (rail) for proper system
operation
DI10-180
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DIAGNOSIS
DI ENG SM - 2004.4
Example of Too Much Injector Back leak
Too Much Injector Back leak
When the injector cannot be sealed due to entering the foreign materials
Ex.:
• Foreign materials in fuel
• Burnt out or worn high pressure pump
• Mechanical damage in inside of injector
Y220_10064
Increased injector back leak volume
Pressure/volume loss
Pump capacity
Pressure/volume
build up
Pressure/volume
consumption
Fuel injection
volume
Injector back
leak volume
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