Engine Controls - Idle Fluctuates Briefly After A Cold Start
SI B12 04 12Engine Electrical Systems
March 2012
Technical Service
SUBJECT
N55: Idle Fluctuates Briefly After a Cold Engine Start
MODEL
E70, E71 with the N55 engine from 4/2010 (SOP) to 10/2011
F07 with the N55 engine from 3/2010 (SOP) to 12/2011
F10, F12, and F13 with the N55 engine from 3/2010 (SOP) to 12/2011
F25 with the N55 engine from 7/2010 (SOP) to 12/2011
SITUATION
Under certain engine cold starts, the engine idle may fluctuate during the first 10-20 seconds of operation before becoming stable.
No faults will be stored in this situation, which will usually only occur at specific engine temperatures, making it difficult to reproduce in the workshop.
CAUSE
Unfavorable DME software calibration
CORRECTION
Program the vehicle using the most current version of ISTA/P.
The corrected DME calibration was introduced as listed above.
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