3.
Was a problem found in any of the above areas?
YES
a.
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
a.
Go to "Exhaust System Inspection" procedure
Visually/physically inspect the following items:
- Ensure that the HO2S is securely installed.
- Check for corrosion on terminals
- Check for terminal tension ( at the HO2S and at the ECM)
- Check for damaged wiring
- Check the HO2S ground circuit for a good connection
Check front and rear HO2S for connections being reversed. If HO2S connections reversed, switch connections properly.
Was a problem found in any of the above areas?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
Go to "Exhaust System Inspection" procedure
Check the exhaust system for an exhaust leak near the engine.
Was an exhaust leak found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
Go to "Air Leakage Inspection " procedure
Visually/physically inspect the following items:
- Vacuum hoses for splits, kinks and improper connections.
- Exhaust system between HO2S and Three way catalyst for air leakage
- EVAP system for leakage
- PCV hose for proper installation
Was a problem found in any of the above areas?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
Go to "Fuel Pressure Inspection" procedure
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.
Test Condition : Ignition "ON" & Engine "ON" & Vacuum hose disconnected at Idle
Specification : 320~340kPa(3.26~3.47 kg/㎠, 46~49 psi)
Is the 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
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
Ignition "OFF" & Engine "OFF"
Check the fuel injectors for clogging or any restrictions
Specification : No clogging and restriction
Is the fuel injector OK?
YES
Go to "Component Inspection" procedure
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure
