Engine Controls - Long Crank Or Rough Idle, DTC's Stored

SI B13 12 10
Fuel Systems

January 2011
Technical Service

This Service Information bulletin supersedes SI B13 12 10 dated December 2010.

[NEW] designates changes to this revision

SUBJECT
Various Glow Plug and Glow Plug Control Unit Faults Stored in DDE

MODEL
E90, E70 with M57Y engines

[NEW] SITUATION
The vehicle may exhibit a long crank or rough idle in colder ambient temperatures. The Service Engine Soon lamp is on.

One or more of the following faults can be stored in the DDE:

^ 4A1F combustion preheating control unit output stage cylinder 1 faulty

^ 4A2F combustion preheating control unit output stage cylinder 2 faulty

^ 4A3F combustion preheating control unit output stage cylinder 3 faulty

^ 4A4F combustion preheating control unit output stage cylinder 4 faulty

^ 4A5F combustion preheating control unit output stage cylinder 5 faulty

^ 4A6F combustion preheating control unit output stage cylinder 6 faulty

^ 494A combustion preheating control unit, diagnostic feedback

CAUSE
Internal fault with the glow plug control unit

CORRECTION

If one or more of the above faults are stored, replace the glow plug control unit and all six glow plugs. Refer to Repair Instructions REP12 21 520 (glow plug control unit) and REP12 23 505 (glow plugs) for component replacement.





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