Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHYUNDAI2009TUCSON LIMITED, 2.0 BREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDTC TROUBLESHOOTING PROCEDURES (2.0L)TROUBLESHOOTING FOR DTCP0171 FUEL TRIM MALFUNCTION - SYSTEM TOO LEAN (BANK 1)SYSTEM INSPECTIONFUEL SYSTEM INSPECTION
2009 Hyundai Tucson Limited, 2.0 B
Fuel System Inspection
2009 Hyundai Tucson Limited, 2.0 BSECTION Fuel System Inspection
- Check the fuel for excessive water, alcohol, or other contaminants. Replace contaminated fuel as necessary
- Install a fuel pressure gage.
- Inspect fuel pressure with engine idling at normal operating temperature.
Specification : 338~348kPa (3.45~3.55kg/cm2 )
- Is fuel pressure within the specified value?
YES
- Go to "FUEL INJECTOR INSPECTION " procedure as below.
NO
- Repair as necessary refer to inspection note as below and go to "VERIFICATION OF VEHICLE REPAIR " procedure.NOTE:
- Check if fuel line pressure decreases when accelerating quickly.
- If it does, check fuel pump maximum pressure. If pressure is OK, check fuel line and filter for clogging.
- If fuel pressure is lower than specification : Check for fuel line pressure while pinching fuel return hose.
- If pressure quickly increases, check pressure regulator.
- If pressure gradually increases, check for clogging between fuel pump and pressure regulator. If hose is not clogged, check fuel pump maximum pressure
- If fuel pressure is higher than specification : Is fuel line clogged?
- If it is not, replace pressure regulator.
- If it is, replace it.
- Check if fuel line pressure decreases when accelerating quickly.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.