1.PERFORM IDLE AIR VOLUME LEARNING
Perform
Special Repair Requirement
.
Is Idle Air Volume Learning carried out successfully?
YES
>>
GO TO 2
.
NO
>>
Follow the instruction of Idle Air Volume Learning.
2.CHECK Intake system
Check for the cause of intake air volume lacking. Refer to the following.
Crushed intake air passage
Intake air passage clogging
Is the inspection result normal?
YES
>>
GO TO 3
.
NO
>>
Repair or replace malfunctioning part
3.CHECK FUEL INJECTION SYSTEM FUNCTION
Perform DTC Confirmation Procedure for DTC P0171, P0174. Refer to
DTC Logic
.
Is the inspection result normal?
YES
>>
GO TO 4
.
NO
>>
Go to
Diagnosis Procedure
for DTC P0171, P0174.
4.PERFORM DTC CONFIRMATION PROCEDURE
Turn ignition switch ON.
Erase DTC.
Perform DTC Confirmation Procedure.See
DTC Logic
.
Is the 1st trip DTC P1421 displayed again?
YES
>>
GO TO 5
.
NO
>>
INSPECTION END
5.REPLACE ECM
Replace ECM.
Go to
Special Repair Requirement
.
>>
INSPECTION END