Engine Controls - Check Fuel Cap Illuminated Or MIL ON

SI M12 03 11
Engine Electrical Systems

January 2012
Technical Service

This Service Information bulletin supersedes SI M12 03 11 dated September 2011.

[NEW] designates changes to this revision

SUBJECT
Service Engine Soon Lamp or Check Fuel Cap Is Illuminated

MODEL
R55 (Cooper Clubman and Cooper Clubman S) with N12, N14, N16 and N18 engine

R56 (Cooper and Cooper S) with N12, N14, N16 and N18 engine

R57 (Cooper and Cooper S Convertible) with N12, N14, N16 and N18 engine

R60 (Cooper Countryman and Cooper S Countryman) with N16 and N18 engine

SITUATION
The customer states that the Service Engine Soon lamp is illuminated. When diagnosed, one of the following faults is stored in the DME fault memory:

^ DMTL Tank Leakage: Fine leak fault codes 27AC, 3140, 321C

^ DMTL Tank Leakage: Super fine leak fault codes 272F, 3141, 321D

CAUSE
Incorrectly installed fuel cap, evaporative system leakage or tank ventilation valve (TEV) that has been jammed open.

PROCEDURE
For all vehicles outlined above, always follow the attached diagnostic fault tree.

1. For all vehicles outlined above, perform the applicable test plan diagnosis module for the tank leak - DMTL, and follow the attached diagnostic fault tree for the fault(s) stored.

If a leakage is found, continue following the test plan to find the resolution. Refer to SI M16 01 07 for troubleshooting procedures, using the VACUTEC(R) Smoke Machine 625-522B-BMW.

2. If no tank leakage is found using the applicable test plan and the attached diagnostic fault tree, then review the vehicle history. If this is first time for this complaint; the vehicle history does not indicate a single instance of the Service Engine Soon (SES) lamp illumination in the past for any complaint, then:

Do not replace any parts and do not initiate a smoke test of the evaporative system.

Confirm the operation of the fuel cap and advise the customer on the importance of installing the fuel cap properly to avoid tank leakage faults (see attached diagnostic fault tree for additional customer information).

If the vehicle has had the Service Engine Soon lamp illuminated in the past and no tank leakage is currently present using the applicable test plan, proceed to step 3.

3. Replace the tank ventilation valve, refer to REP 13 90 500 for replacement procedures.

[NEW] Note:
TeileClearing authorization is no longer required for the tank ventilation valve replacement procedure described in this bulletin.

PARTS INFORMATION FOR REPEAT VISIT ONLY
Refer to the current version of EPC for the latest available replacement tank ventilation valve part number.





WARRANTY INFORMATION

ATTACHMENT





Diagnostic Fault Tree - Tank Ventilation Valve (Purge Valve)





Diagnostic Fault Tree: EVAP System Overview