Engine Controls - MIL ON/Fault Code 2EF4 Stored
SI B12 07 06Engine Electrical Systems
January 2007
Technical Service
This Service Information bulletin supersedes S.I. B12 07 06 dated January 2007.
[NEW] designates changes to this revision
SUBJECT
"Service Engine Soon" Light Illuminated: FC 2EF4 Map Thermostat
MODEL
E90, E91 (3 Series) all models equipped with N52 engine.
E60, E61 (5 Series) all models equipped with N52 engine.
Vehicles produced up to March 2006
SITUATION
Customer complains that the "Service Engine Soon" light is illuminated while driving. DME fault code 2EF4 Thermostat Map Cooling is stored. In some instances the customer also complains about insufficient vehicle heating.
CAUSE
E60 Vehicles:
1. DME software error
2. Internal leakage in radiator causing insufficient heating effect.
E90 Vehicles:
1. An unsatisfactory weld causes interference between the thermostat and the plastic housing. This condition applies only to BEHR Map Thermostats (black plastic housing). Thermostats manufactured by WAHLER (silver aluminum housing) are not affected.
2. Internal leakage in radiator causing insufficient heating effect.
PROCEDURE
E60 Vehicles:
1. Run vehicle to operating temperature, a short ten-minute drive may be needed.
2. Connect vehicle to DIS Plus or GT1 to monitor the Engine Coolant Temperature Sensor and Radiator Output Temperature Sensor.
3. Allow vehicle to idle for approximately 5 minutes in the workshop, record the values of the two temperature sensors.
4. Between the two temperatures a difference of 20 degrees Celsius should exist. If the temperature difference is less than 20 degrees Celsius replace the radiator and reprogram the vehicle with Progman 23.0 or higher. If the temperature difference is greater than 20 degrees Celsius only reprogram vehicle with Progman V23.0 or higher.
Good Example: Engine Temperature = 95 degrees Celsius and Radiator Outlet Temperature = 67 degrees Celsius.
E90 Vehicles:
1. Run vehicle to operating temperature, a short ten-minute drive may be needed.
2. Connect vehicle to DIS Plus or GT1 to monitor the Engine Coolant Temperature Sensor and Radiator Output Temperature Sensor.
3. Allow vehicle to idle for approximately 5 minutes in the workshop, record the values of the two temperature sensors.
4. Between the two temperatures a difference of 20 degrees Celsius should exist. If the temperature difference is less than 20 degrees replace the radiator. If the temperature difference is greater than 20 degrees Celsius proceed to step 5.
Good Example: Engine Temperature = 95 degrees Celsius and Radiator Outlet Temperature = 67 degrees Celsius.
5. Verify the production date of the thermostat. Thermostats produced prior to November 25th, 2005, are affected. The production date of the part can be found above the BMW Roundel on the plastic housing.
Example: 25.11.2005 = 25th day of November 2005
Note: Removing the thermostat from the vehicle is not necessary to view the production date. The production date can be seen from the top of the engine bay looking downward using a droplight or flashlight.
6. If affected, replace the thermostat in accordance with Repair Instruction RA 11 53 000 Removing and installing/replacing coolant thermostat (N52).
Note: BMW recommends filling the cooling system for protection against freezing down to -34 deg;F (-37 deg;C). This means an antifreeze ratio of 50% antifreeze and 50% water. In severely cold areas, the antifreeze can be increased to 60% which provides freezing protection down to -62 deg;F (-52 deg;C). Do not exceed a 60% ratio of antifreeze.
The specified antifreeze ratio is important, since an insufficient amount would impair antifreezing and corrosion inhibiting protection. An excessive amount would not improve freezing protection, but instead reduce freezing protection. At all times the antifreeze and water should be pre-mixed before pouring into the engine. If pre-mixing is not performed damage will occur to the water pump assembly.
PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code Refer to KSD
Labor Operation: Refer to KSD
Labor Allowance: Refer to KSD
Disclaimer