Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM IDLE AIR VOLUME LEARNING
Perform "IDLE AIR VOLUME LEARNING: SPECIAL REPAIR REQUIREMENT ".

Is Idle Air Volume Learning carried out successfully?

YES: GO TO 2.

NO: Follow the instruction of Idle Air Volume Learning.
CHECK INTAKE SYSTEM
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
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.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.
  See "DTC LOGIC ".
  
  Is the 1st trip DTC P050A, P050B or P050E displayed again?
  
  YES: GO TO 5.
  
  NO: INSPECTION END
REPLACE ECM
Replace ECM.

: INSPECTION END