Engine - MIL ON/DTC's 2746/2B5B/2B5C

SI M 12 01 08
Engine Electrical Systems

August 2008
Technical Service

SUBJECT
Service Engine Soon Lamp Illuminated: Lean Mixture Faults Stored in DME

MODEL
R55 (Cooper Clubman S) with N14 engine

R56 (Cooper S) with N14 engine

Vehicles produced from January 1st, 2008 to June 1st, 2008

SITUATION
The customer complains that the Service Engine Soon Lamp is illuminated in conjunction with loss of power or hesitation while accelerating. One or more of the following faults are stored:

^ 2746 multiplicative mixture adaptation - Mixture too lean

^ 2B5B Air-mass sensor, plausibility - Air mass compared with model too high

^ 2B5C mass sensor, plausibility





CAUSE
An induction leak can occur at the charge air pipe; the fracture is located in the charge pipe, just before the EDK throttle valve.

PROCEDURE

On a customer complaint basis, identify the location of the leak, using a smoke machine. If leakage is identified, then replace the intake charge pipe with PN 13 71 2 753 078. A removal procedure for the intake charge pipe is not available; refer to Repair Instruction RA 13 54 030, Removing and installing/sealing throttle valve assembly (N14), to assist in the removal of the charge pipe. Removal of the EDK throttle valve is not necessary.

MINI recommends using the VACUTEC(R) Smoke Machine 625-522B-BMW. This device automatically converts air to high purity nitrogen, using Pressure Swing Absorption (PSA) nitrogen technology. Orders for the VACUTEC(R) Smoke Machine 625-522B-BMW can be placed by calling the Equipment
Program.





PARTS INFORMATION





WARRANTY INFORMATION
Covered under the terms of the MINI New Vehicle Limited Warranty





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