Diagnosis Procedure

Perform "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 LOGIC ".

Is the inspection result normal? 

YES: GO TO 4.

NO: Proceed to "DIAGNOSIS PROCEDURE " for DTC P0171, P0174.

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

   See "DTC LOGIC ".

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

   YES: Replace ECM. Refer to "REMOVAL AND INSTALLATION ".

   NO: INSPECTION END