Engine Controls - MIL ON/DTC P1421 Stored In Memory

Classification: EC11-012

Reference: NTB11-024

Date: March 7, 2011

2007-2010 SENTRA; MIL "ON" WITH DTC P1421 STORED

APPLIED VEHICLE: 2007-2010 Sentra (B16) - MR20DE engine ONLY

IF YOU CONFIRM:

An Applied Vehicle has the MIL "ON" with DTC P1421 (Cold Start Control) stored in the ECM,

AND

There are no drivability issues.

ACTION

1. Refer to Step 2 in the Service Procedure to confirm this bulletin applies to the vehicle you are working on.

2. If this bulletin applies, reprogram the ECM.





CLAIMS INFORMATION

IMPORTANT:
The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.

SERVICE PROCEDURE

1. Connect C-III to the vehicle to begin the reprogramming procedure.

If you are not familiar with the reprogramming procedure, refer to the "CONSULT- III (C-III) ECM Reprogramming" general procedure.





CAUTION





2. When you get to the ECM Reprogramming screen shown in Figure 1, confirm this bulletin applies as follows.

A. On your C-III screen, look at the Part Number column (see Figure 1):

^ If this column is blank (no part number listed), this bulletin does not apply. Close C-III and refer to ASIST for further diagnostic information.

^ If a Part Number is listed, write it on the Repair Order.








B. Compare the Part Number you wrote down to the numbers in the Current ECM Part Number column in Table A.

^ If there is a match, this bulletin applies. Continue with the reprogramming procedure.

NOTE:
If there are two lines (two reprogramming options) on your C-III screen, use the one that does not have the message "Caution! Use ONLY with NTBXX-XXX"

^ If there is not a match, this bulletin does not apply. Close C-III and refer to ASIST for further diagnostic information.





3. If this bulletin applies and you have performed ECM reprogramming, the screen in Figure 2 appears when reprogramming is complete.

NOTE:
If the screen in Figure 2 does not display (reprogramming does not complete).

4. Make sure to erase DTCs from all Systems.

NOTE:
During reprogramming, DTCs will set in several systems and must be erased.

5. Test drive the vehicle and make sure it operates correctly and the MIL is OFF.

^ If the MIL comes ON, go back to ASIST for further diagnostic information.

^ Diagnosis and repairs beyond ECM reprogramming are not covered by this bulletin.