Nissan Versa

 Sedan Service Manual

Engine » Engine control system (EC) » P050a, P050b, P050e cold start control
Diagnosis Procedure

1.PERFORM IDLE AIR VOLUME LEARNING

Perform EC, "Work Procedure".

Is Idle Air Volume Learning carried out successfully?

YES >> GO TO 2.

NO >> Follow the instruction of Idle Air Volume Learning.

2.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

3.CHECK FUEL INJECTION SYSTEM FUNCTION

Perform DTC Confirmation Procedure for DTC P0171. Refer to EC, "DTC Logic".

Is the inspection result normal?

YES >> GO TO 4.

NO >> Go to EC, "Diagnosis Procedure" for DTC P0171.

4.PERFORM DTC CONFIRMATION PROCEDURE

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

   See EC, "DTC Logic".

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

YES >> GO TO 5.

NO >> INSPECTION END

5.REPLACE ECM

Replace ECM. Refer to EC, "Removal and Installation".

>> INSPECTION END

DTC Logic

Diagnosis Procedure