Classification:

EC15-009

Reference:

Date:

NTB15-055

June 24, 2015

2005-2015 NISSAN VEHICLES;
ECM REPROGRAMMING – SERVICE INFORMATION
APPLIED VEHICLES: All 2005 - 2015 Nissan vehicles

SERVICE INFORMATION
After ECM reprogramming, the Calibration Verification Number (CVN) needs to be
automatically calculated prior to State emissions testing (also known as Inspection
Maintainence, I/M, or SMOG testing depending upon location). Allowing the vehicle to
idle for 22 minutes will allow for faster CVN calculation. It is recommended that customers
utilize this method if the vehicle needs to be tested for emissions soon after ECM
reprogramming.

ACTION
1. Ask the customer if he/she is planning to take the vehicle to an emissions test soon
after ECM reprogramming.
2. If YES, advise the customer to idle the vehicle outdoors for 22 minutes prior to
emissions testing. (This 22 minutes is required during the same engine run cycle,
but does not need to be continuous idle.)

BACKGROUND
When an ECM on an applied vehicle is reprogrammed for any reason, the CVN needs to
be automatically recalculated. This process can take place while the vehicle is driven, but
can occur faster if the engine is allowed to idle for up to 22 minutes (depending on model).
Typically, the correct CVN is required for vehicles to pass state or local emissions testing,
so customers are advised to idle the vehicle for 22 minutes if he/she is planning to take the
vehicle to an emissions test soon after the ECM is reprogrammed.

Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are
properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job
properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO
NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle.

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