Engine Controls - Idle Fluctuation When Engine Is Cold

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Technical Service Bulletin # 11-049B Date: 111110

Engine Controls - Idle Fluctuation When Engine Is Cold

Classification: EC11-015B

Reference: NTB11-049B

Date: November 10, 2011

2010-2012 ALTIMA SEDAN AND COUPE;

IDLE FLUCTUATION WHEN ENGINE IS COLD

This bulletin has been amended. APPLIED VEHICLES, the description under IF YOU CONFIRM, and Table A have been revised. Please discard

all previous copies.

APPLIED VEHICLES:2010-2012 Altima Sedan and Coupe (L32 and CL32)

APPLIED ENGINE: QR25DE (4 cylinder engine)

with California Emissions ONLY

IF YOU CONFIRM

The idle speed fluctuates from approximately 1,000 to 2,000 RPM during ALL of the following conditions:

^ Occurs for no more than one minute after the engine is started

^ ONLY when the engine is cold

^ ONLY when the transmission is in Park or Neutral

AND

The idle speed is normal (stable) when the engine warms to normal operating temperature.

NOTE:

This incident, if it should occur, may occur immediately after an oil change.

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.

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.

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Page 481

CLAIMS INFORMATION

SERVICE PROCEDURE

1. Connect the CONSULT PC 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.

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Page 482

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 will display when reprogramming is complete.

NOTE:

If the screen in Figure 2 does not display (reprogramming does not complete). Refer to the "ECM Reprogram Interruption Recovery general

procedure".

^ Print this screen and attach it to the Repair Order for Warranty documentation.

4. Make sure to erase DTCs from all systems.

NOTE:

2010 Nissan-Datsun Altima L4-2.5L (QR25DE) Page 483

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.