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