DTC Diagnosis Procedure

Refer to Work Procedure .

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, P0174. Refer to Confirmation Procedure (P0171) or, refer to Confirmation Procedure (P0174).

Is the inspection result normal?

YES

GO TO 4.

NO

Refer to DTC Diagnosis Procedure (P0171) or, refer to DTC Diagnosis Procedure (P0174).

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

   Refer to Confirmation Procedure .

Is the 1st trip DTC P050A displayed again?

YES

GO TO 5.

NO

INSPECTION END

1. Replace ECM.
2. Refer to ECM : Removal & Installation .

INSPECTION END