Fuel System - MIL ON, Vapor Forming In Fuel System
SI B12 21 11Engine Electrical Systems
December 2011
Technical Service
SUBJECT
N63 - Engine Malfunction Warning Due to Vapor Forming in the Fuel System
MODEL
F01, F02, and F04 with the N63 engine produced from 9/2009 to 8/2011
SITUATION
The Engine Malfunction warning is displayed and the Service Engine Soon (MIL) Lamp is on.
This situation may occur when starting the engine at operating temperature after a "hot-soak" period. It is more likely to occur during months with cooler ambient temperatures and winter fuel is available.
The following fault code is stored in the DME.
110001 - Cylinder injection cut-off: pressure too low in the high pressure system.
And additionally in isolated cases fault:
11A002 - Fuel high-pressure system, fuel pressure: minimum pressure undershot.
Note:
This fault may occur if the engine runs out of fuel.
CAUSE
This problem can occur if vapor forms in the fuel system due to excessive temperatures and fuel quality characteristics.
CORRECTION
Perform the recommended test plan(s) using only the most current version of ISTA/D.
Based upon the results of the test plan(s), if no problem is found and the low side pressure supply is correct then perform the following conversion using the latest version of ISTA/P.
Conversion: control fuel feed pressure
This will add the E-Word (KV01) to the vehicle order (VO) and install DME calibration which increases the low side supply pressure to 5.9 BAR when necessary to prevent vapor formation.
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
Covered under the terms of the BMW New Vehicle/SAV Limited Warranty, any applicable Federal, State or BMW Emissions Warranty or the BMW Certified Pre-Owned Limited Warranty (only applies to CPO vehicles that are still within the CPO coverage period but beyond any Emissions Warranty.