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 : 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.
