Engine Controls - Power Reduction/Idle Actuator Faults

SI B 12 19 08
Engine Electrical Systems

May 2008
Technical Service

S85 - Power Reduction with Idle Actuator Faults Stored

MODEL
E60 M5 from SOP up to 3/08
E63, E64 M6 from SOP up to 3/08

SITUATION
The Service Engine Soon light (MIL) is illuminated. The engine power reduction mode is activated with
any of the following idle actuator (LLS) faults stored:

2B0E: idle actuator, monitoring bank 2

2B0D: idle actuator, monitoring bank 1

2B23: idle actuator, governor monitoring, bank 1

2B24: idle actuator, governor monitoring, bank 2

CAUSE
Certain engine operating conditions could lead to overheating of the idle actuator (LLS) motor electrical components.

If the engine is operated at low load conditions with the idle actuators open and the throttle valves positioned at less than 10% (constant-speed highway driving, for example), the idle actuators could fault.

When the idle actuators (LLS) remain steady in the open position during this type of driving, it is possible that the contacts on the LLS motor commutator may begin to degrade and cause operational faults.

CORRECTION

The DME software has been improved to include a "wiping function" of the LLS, beginning at a 3% throttle opening. This functional change in the LLS control will help maintain the electrical integrity of the internal motor contacts.

On a customer complaint basis only, reprogram the vehicle with the latest version of Progman.

This DME software improvement is included with integration level E060-08-03-500 and higher.

In the event that one of the idle actuators continues to fault after the DME programming, it will then be necessary to replace it.

WARRANTY INFORMATION





Covered under the terms of the BMW New Vehicle Limited Warranty.





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