Engine Controls - MIL ON/DTC P1421 Set

Classification: EC10-028

Reference: ITB10-064

Date: October 7, 2010

2011 M37; MIL 'ON' WITH DTC P1421 STORED

APPLIED VEHICLE: 2011 M37 (Y51)

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 CONSULT III (C-III) to the vehicle to begin the reprogramming 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 P/N column in Table A above.

^ 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.





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

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

^ Print the page from C-III (C-III page example above) 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. Refer to the applicable Electronic Service Manual (ESM) as needed.

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