Engine Controls - No Start/SES/DSC Lamps ON/Multiple DTC

SI B 12 49 06
Engine Electrical Systems

April 2007
Technical Service

This Service Information bulletin supersedes S.I. B12 49 06 dated November 2006.

[NEW] designates changes to this revision

SUBJECT
DME MS45 - FC28B2, 28AA, 28AC; Internal RAM Faults

MODEL
E46 M54 with MS45.1 from 9/00 to 7/06
E83 M54 with MS45.0/MS45.1 from 9/03 to 9/06
E85 M54 with MS45.0 from [NEW] 10/04 to 1/06
E60 M54 with MS45.1 from 9/03 to 3/05

SITUATION

Customers may complain about a crank/no start or a rough start situation. The "Service Engine Soon Light" or the DSC light is illuminated, and one of the 3 scenarios may apply:

1. FC 28B2 "rpm limiting reset " is stored in the DME together with one, or more of the following faults which are caused by the 28B2:

^ FC 28AC - "nominal torque",

^ FC 2796 - "throttle flap: adaptation wrong",

^ FC 27A1 - "throttle flap: start check",

^ FC 2869 - "DME self diagnostic: RAM check failed".

2. FC 28AA "idle speed regulator" is stored in the DME.

3. FC 28AC "nominal torque" is stored in the DME.

CAUSE

Fault codes 28B2, 28AA and 28AC indicate an internal DME RAM fault.

PROCEDURE

Perform the appropriate DIS/GT1 test modules for the 28B2, 28AA or 28AC.

Replace the DME if prompted by the DIS/GT1 test module results.

Important:
Do not replace the throttle body for the throttle faults, stored in conjunction with FC28B2, even when the test plan recommends to do so.

WARRANTY INFORMATION

Covered under the terms of the BMW New Vehicle Limited Warranty.

Defect Code: Refer to KDS

Labor Operation: Refer to KDS

Labor Allowance: Refer to KDS





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