Diagnosis Procedure

DIAGNOSIS PROCEDURE

Step	Action	YES	NO
1	CHECK PCV HOSE CONNECTION Confirm that PCV hose is connected correctly. OK or NG	GO TO 2.	Repair or replace.
2	CHECK INTAKE AIR LEAK Start engine and let it idle. Listen for an intake air leak after the mass air flow sensor. OK or NG	GO TO 3.	Discover air leak location and repair.
3	REPLACE ECM Stop engine. Replace ECM. Perform initialization of immobilizer system and registration of all immobilizer system ignition key IDs. Refer to [ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT: SPECIAL REPAIR REQUIREMENT ] Perform VIN Registration . Perform Accelerator Pedal Released Position Learning .. Perform Throttle Valve Closed Position Learning . Perform Idle Air Volume Learning .	INSPECTION END