DTC Diagnosis Procedure

Perform Description .

Is Idle Air Volume Learning carried out successfully?

YES

GO TO 2.

NO

Follow the instruction of Idle Air Volume Learning.

Check for the cause of intake air volume lacking. Refer to the following.

• Crushed intake air passage
• Intake air passage clogging
• Clogging of throttle body

Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace malfunctioning part

Perform DTC Confirmation Procedure for DTC P0171. Refer to DTC Description .

Is the inspection result normal?

YES

GO TO 4.

NO

Go to Diagnosis Procedure for DTC P0171.

1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.

   See DTC Confirmation Procedure .

Is the 1st trip DTC P050B displayed again?

YES

GO TO 5.

NO

INSPECTION END

Replace ECM. Refer to Removal and Installation .

INSPECTION END