Description
ECM has the memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the Idle Air Volume Learning value memory, etc. even when the ignition switch is turned OFF.
DTC DETECTION LOGIC
DTC No. | Trouble diagnosis | DTC detecting condition | Possible cause |
P0603 |
ECM BACK UP/CIRCUIT (ECM power supply circuit) | ECM back-up RAM system does not function properly. |
|
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
Is 1st trip DTC detected?
YES >> Go to EC, "Diagnosis Procedure".
NO >> INSPECTION END
1.INSPECTION START
Is the 1st trip DTC P0603 displayed again?
YES >> GO TO 2.
NO >> INSPECTION END
2.REPLACE ECM
>> INSPECTION END
Emission control system warranty
Your NISSAN vehicle is covered by the following
emission warranties:
For USA
1. Emission Defects Warranty
2. Emissions Performance Warranty
Details of this warranty may be found with other
vehicle warranties in your Warranty Information
Booklet which comes with your NISSAN vehicle.
If you ...
Reporting safety defects
For USA
If you believe that your vehicle has a defect
which could cause a crash or could
cause injury or death, you should immediately
inform the National Highway Traffic
Safety Administration (NHTSA) in addition
to notifying NISSAN.
If NHTSA receives similar complaints, it
may open an inv ...