Engine/A/T Controls - 8HP45-Delay In Engine Response
SI B12 17 12Engine Electrical Systems
November 2012
Technical Service
SUBJECT
N52T / N55 with 8HP45: Delay in Engine Response
MODEL
F10 and F25 with the N52T engine and 8HP45 transmission to 3/31/2012
E70, E71 and F25 with the N55 engine and 8HP45 transmission to 3/31/2012
F07, F10 with the N55 engine and 8HP45 transmission to 2/29/2012
SITUATION
A customer may complain of a delay in engine response after decelerating at low road speeds and then reaccelerating. This can occur when the transmission remains in a high gear due to a delay in the transmission downshifting.
This situation can be more noticeable while driving on roads with slight turns or with an increasing gradient.
CAUSE
Unfavorable EGS and DME software
CORRECTION
Depending on the vehicle, engine variant and current integration level program the vehicle using only the latest version of ISTA/P as listed below.
For F10 and F25 N52T vehicles:
The first measure with improved EGS software was introduced in 3/2012 and ISTA/P 2.46.0 with the integration levels:
F010-12-03-500 / F025-12-03-501
The second measure with both DME and EGS software improvements were introduced in 11/2012 and ISTA/P 2.48.1 with the integration levels:
F010-12-11-502/ F025-12-11-502
For E70, E71, F07, F10 and F25 N55 vehicles:
Improved DME and EGS software was introduced in 3/2012 and ISTA/P 2.46.0 with the following integration levels:
E070-12-03-500 / F001-12-03-500 / F010-12-03-500 / F025-12-03-501
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