System Diagnostics

Check air leakage 

1. Check for contamination and installation of Gaskets.
   • Check throttle body gasket
   • Check gasket between intake manifold and surge tank.
   • Check for contamination or restrictions by foreign material between intake manifold and injectors.
   • Check for contamination or foreign materials between surge tank and PCSV
2. Is there any air leakage?

   YES  Repair or replace as necessary and then, go to "Verification of Vehicle Repair " procedure.

   NO  Go to " Check exhaust system for Restrictions" as follows.

Check exhaust system for Restrictions 

1. Check exhaust system for:
   • Restricted or broken muffler
   • Damaged catalyst
2. Is the exhaust system restricted?

   YES  Repair or repalce as necessary and then, go to "Verification of Vehicle Repair " procedure.

   NO  Go to "Check throttle valve for binding" as follows.

Check throttle valve for binding 

1. IG "OFF".
2. Remove air hose between throttle body and airflow sensor.
3. Check if throttle valve is stuck or binding by objects or carbon deposits.
4. Is the throttle valve operating correctly?

   YES  Go to "Component Inspection" procedure.

   NO  After removing foreign material, check throttle valve operation. If replacing TPS and ETC throttle assembly; Do "Procedure of ETC Initialization". Go to "Verification of Vehicle Repair "

   • Procedure of ETS Initialization
   1. Erase DTCs on ECM.
   2. Turn the ignition key off until the main relay is turned off. (It will take 10sec.)
   3. Turn ignition key on for more than 1second to record the throttle motor position on the EEPROM.