Engine Controls - Rough Cold Idle

Classification:
EC11-002

Reference:
ITB11-004

Date:
January 14, 2011

2011 M56; ENGINE RUNS ROUGH AT IDLE WHEN COLD

APPLIED VEHICLES:
2011 M56 (Y51)

APPLIED ENGINE
VK56VD

IF YOU CONFIRM

The engine runs rough at idle when cold

ACTIONS

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





Submit a Primary Part (PP) type line claim using the claims coding shown.

IMPORTANT:
The purpose of ACTIONS (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 CONSULT III (C-III) to the vehicle to begin the reprogramming procedure.

^ If you are not familiar with the reprogramming procedure see "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 example).

^ If this column is blank (no part number listed) this bulletin does not apply. If a Part Number is listed write it on the Repair Order and then go to Step B.

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 ITBXX-XXX".

^ If there is not a match this bulletin does not apply.





Table A

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

NOTE:
If the screen in Figure 2 does not display (reprogramming does not complete) click here. This links 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 all DTCs from all Systems.

NOTE:
During reprogramming DTCs will set in several systems. These DTCs must be erased from all systems.

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.





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