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Component 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 relevant component(s) as necessary and then go to "VERIFICATION OF VEHICLE REPAIR ".
  NO
  - Go to next step as below.
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 relevant component(s) as necessary and then go to "VERIFICATION OF VEHICLE REPAIR ".
  NO
  - Go to next step as below.

Check fuel pressure

IG KEY "OFF".
Connect fuel pressure gauge on the fuel filter with fuel pressure gauge adaptor.
Start engine again and measure fuel pressure.
Is the sensor output normal?
Specification: 3.29 ~ 3.70 kgf/cm²

YES
- Go to next step as below.
NO
- Repair relevant component(s) as necessary and then go to "VERIFICATION OF VEHICLE REPAIR ".

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

Check PCV
1. Turn the ignition switch "OFF" and remove PCV valve from rocker cover.
2. Insert a thin stick into the PCV valve from the threaded side and verify that the plunger is moving.
3. Is the PCV valve normally moving?
  YES
  - Go to next step as below.
  NO
  - Repair relevant component(s) as necessary and then go to "VERIFICATION OF VEHICLE REPAIR ".
Check injector for normal operation
1. Start engine.
2. Check its RPM decrease when doing the injector's actuation test.
3. Is there any cylinder with no change in RPM or only a small change in RPM?
  YES
  - Clear DTC and Test-drive under Prerequisite conditions above-mentioned. After the test, If this DTC is set, go to "Inspection & Repair" procedure. If not, troubleshooting is completed.
  NO
  - Repair relevant component(s) as necessary and then go to "VERIFICATION OF VEHICLE REPAIR ".