Fuel System - Vapor Forming In Fuel System MIL ON
SI B12 22 11Engine Electrical Systems
January 2013
Technical Service
This Service Information bulletin supersedes SI B12 22 11 dated November 2012.
[NEW] designates changes to this revision
SUBJECT
N63: Engine Malfunction Warning Due to Vapor Forming in the Fuel System
MODEL
F07, F10, F12, and F13 with the N63 engine produced to approximately 6/2011
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 cutout: pressure too low in high-pressure system
And additionally in isolated cases fault:
11A002 - Fuel high-pressure system, fuel pressure: minimum pressure undershot
CAUSE
This problem can occur if vapor forms in the fuel system due to excessive temperatures and fuel quality characteristics. Areas using winter fuel blends with high ethanol content are perhaps more susceptible in having this situation to occur.
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 repairs.
[NEW] Vehicles without the Improved Fuel Supply Module (In-tank Electric Fuel Pump):
Replace the fuel pump supply module (refer to SI B16 04 10) and then perform the following conversion using the latest version of ISTA/P.
[NEW] Target integration level: F0xx-12-07-533 or higher
Conversion: control fuel feed pressure
This will add the E-Word (KV01) to the vehicle order (VO) and install DME calibration which will increase the low side supply pressure to 5.9 BAR when necessary to prevent vapor formation.
[NEW] In addition, further DME software improvements were implemented with integration level F0xx-12-07-533 and higher in order to reduce under hood temperatures under certain driving conditions with an optimized auxiliary fan strategy.
[NEW] Vehicles with the Improved Fuel Supply Module (In-tank Electric Fuel Pump):
The fuel supply modules were improved starting in mid-June 2011 production with the parts stock cleared of the early design parts.
[NEW] Production solution with both the improved fuel supply module and the initial DME software calibration changes were introduced beginning 9/2011.
The new supply modules have the improvements needed to ensure long term durability when operated at an increased output pressure.
This is now the only replacement part available and is identified by the letter "A" at the end of the bar code / part label (located on top of the part) or by a "Green" dot on the box.
Perform the following conversion using the latest version of ISTA/P only.
[NEW] Target integration level: F0xx-12-07-533 or higher
Conversion: control fuel feed pressure
IMPORTANT!
The ISTA/P conversion to increase the fuel feed pressure can only be performed once the latest fuel supply module has been installed or found to already be installed by the presence of the "A" on the bar code / part label.
[NEW] 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. This documentation is not necessary when part of an approved Technical Service repair procedure; the battery charger is required to be attached before performing the Vehicle Test.
PARTS INFORMATION
WARRANTY INFORMATION
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