Check clog on Exhaust gas system
Key "OFF".
Check clog on muffler or catalyst converter.
Is Exhaust gas system O.K. ?
YES
Go to "Intake air system check" procedure.
NO
Repair as necessary and go to "Verification of vehicle Repair" procedure.
Intake air system check
Check leakage on Intake air system
▶ Check looseness, deterioration or contamination on throttle body and gasket.
▶ Check contamination, damage or crack on intake manifold, ISCA and injectors.
▶ Check contamination or stuck on ISCA and EGR valve.
Is there any leakage?
YES
Repair as necessary and go to "Verification of vehicle Repair" procedure
NO
Go to "Fuel line check" procedure.
Fuel line check
Check "Fuel line system"
▶ Check looseness of connectors on fuel line.
▶ Check looseness, damage, or interference of vacuum hose on fuel line.
▶ Check damage, leakage or bending on fuel line pipe.
Is fuel line normal ?
YES
Go to "Fuel line pressure check" procedure.
NO
Repair as necessary and go to "Verification of vehicle Repair" procedure.
Fuel line pressure check
Key "OFF".
Disconnect a fuel pump relay.
Engine start and wait until engine stop. and then key "OFF".
Connect a fuel pump relay.
Connect a fuel pressure guage to a fuel filter by a fuel pressure guage adaptor.
Engine start and measure a fuel pressure.
Specification : Approx. 3.5㎏/㎠
Is the fuel pressure normal?
YES
Go to "Component inspection" procedure.
NO
Check clogging on the fuel filter.
Check the valve in a fuel pressure regulator. (If it has a problem, fuel happen to be leaked to a return line.)
Check the supply pressure of fuel pump.
Repair as necessary and go to "Verification of vehicle Repair" procedure
