Engine Controls - N55 - Intermittent Loss Of Power

SI B12 09 12
Engine Electrical Systems

November 2012
Technical Service

SUBJECT
N55: Intermittent Loss of Power

MODEL All with the N55 engine produced to 11/2012

SITUATION
Intermittently, the engine idle speed may fluctuate up and down or cut off under any of the following circumstances, without any relevant faults stored in the DME memory:

^ While driving off throttle (coasting) and braking at speeds below approx. 10 mph

^ While idling, low-speed maneuvering such as parking, or if the steering is turned to the full-lock position

CAUSE
Unfavorable DME software

CORRECTION
Program the vehicle using the latest version of ISTA/P.

Initial DME calibration improvements for this situation were introduced in 7/2012, and are now completely corrected in 11/2012 with ISTA/P 2.48.1 as listed below:

E70, E71:

E070-12-11-502 or a more recent version

E82, E88, E90, E92, E93:

E89x-12-07-508 or a more recent version

F07:

F001-12-11-502 or a more recent version

F06, F10, F12, F13:

F010-12-11-502 or a more recent version

F25:

F025-12-07-508 or a more recent version

F30:

F020-12-11-502 or a more recent version

Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.

For information on programming and coding with ISTA/P, refer to CenterNet / Aftersales Portal / Service / Workshop Technology / Vehicle Programming.

Note:
When the ISTA system message displays: Battery voltage only "XX.XX" V. Please connect charger. Please note the displayed battery voltage reading in the repair order comments section.








WARRANTY INFORMATION