Fuel System - HDP High Pressure Faults Diagnostics

SI B12 11 10
Engine Electrical Systems

January 2011
Technical Service

This Service Information bulletin supersedes B12 11 10 dated June 2010.

[NEW] designates changes to this revision

SUBJECT
N54, N54T, N55 - Diagnosis for HDP High-pressure Faults

MODEL
E82, E88, E89, E90, E92, E93, E60, E61, E71, F01, and F02 vehicles with the N54 or N54T engine

E82, E88, E90, E92, E93, E70, E71, F07, and F10 vehicles with the N55 engine

SITUATION

The following HDP high fuel pressure faults may be stored in the DME control module:

^ 2FBE (Fuel pressure too high, after engine stop) on E6x, E8x, E9x, and E71 vehicles with N54 or N54T (DME variants MSD80 or MSD81)

^ 11A301 (Fuel high pressure after engine stop; pressure too high) on F01 and F02 vehicles with N54 (DME variant MSD87)

^ 2BEC (Fuel high pressure after engine stop; pressure too high) on E7x, E8x, and E9x vehicles with N55 (DME variant MEVD17.2)

^ 11A301 (Fuel high pressure afier engine stop; pressure too high) on F07 vehicles with N55 (DME variant MEVD17.2)

CAUSE

An erroneous fault is stored due to the DME diagnostic software error. If stored as the only HDP-related faults, 2FBE/11A31/2BEC will not cause SES lamp illumination or drivability complaints, nor do they indicate any failure of the HDP pump.

In most cases, the fault frequency only occurs once.

CORRECTION

Do not replace any components or conduct any further diagnosis for 2FBE/11A301/2BEC faults. Clear the fault memory. DME diagnostic software will be corrected in the upcoming ISTA/D versions.

If additional faults are stored (besides 2FBE/11A31/2BEC), further ISTA diagnosis should be conducted on the faults identified.

[NEW] For comprehensive diagnosis of the N55 fuel system, refer to the attachment "N55_Engine_Fuel_System_DFT_01_18_11".

WARRANTY INFORMATION
For information only

ATTACHMENTS








B121110_N55_ENGINE_FUEL_SYSTEM_DFT_01_18_11.