System Inspection

Check air leakage
1. Visually/physically inspect the air leakage in intake/exhaust system for following items
  Vacuum hoses for splits, kinks and improper connections.
  
  Throttle body gasket.
  
  Gasket between intake manifold and cylinder head.
  
  Seals between intake manifold and fuel injectors.
  
  Exhaust system between HO2S and three way catalyst for air leakage.
2. Has a problem found in this procedure?
  YES
  
  Repair or replace it which has a problem, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  NO
  
  Go to " 2Check the fuel line" as follows.
Check the fuel line
1. Check the fuel line for following items
  Connector connection state.
  
  Damage/connection state for vacuum hoses connected to fuel line.
  
  Bent/pressed/twisted fuel line or fuel leakage.
2. Has a problem found in this procedure?
  YES
  
  Repair or replace it which has a problem, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  NO
  
  Go to " 3Check fuel pressure" as follows.
Check fuel pressure
NOTE:
1. Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.
2. The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury or fire damage to vehicle components.
1. IG "OFF" and disconnect Fuel Pump Relay in Junction Box.
2. Start-up and wait until it stops itself.
3. IG "OFF" and connect Fuel Pump Relay.
4. Install the fuel pressure gauge to the delivery pipe with the fuel pressure gauge adaptor.
5. Activate the fuel pump, and with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
6. Measure the fuel pressure at idle.
  Specification: 374.6 ~ 384.4 kPa (3.82 ~ 3.92 kg/cm² , 54.3 ~ 55.8 psi)
7. Is the measured fuel pressure within specifications?
  YES
  
  Go to "COMPONENT INSPECTION " procedure.
  
  NO
  
  Repair or replace according to the below table. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Condition	Possible Cause
Fuel Pressure is too low	Fuel filter, fuel pressure regulator, in-tank fuel hose or the fuel pump
Fuel Pressure is too high	Fuel pressure regulator, hose or pipe