DTC Diagnosis Procedure

Perform 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 DTC Description . Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Refer to DTC Diagnosis Procedure . for DTC P0171, P0174.

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

   Refer to DTC Description .

Is the 1st trip DTC P050A, P050B or P050E displayed again?

YES>>

GO TO 5.

NO>>

INSPECTION END

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

>>

INSPECTION END