Sunday, April 1, 2018

******** Audi TTS Quattro Coupe (8J3) L4-2.0L Turbo (CDMA) Technical DIAGNOSIS AND REPAIR # 170916 Date: 091201


Engine - MIL ON/Rough Idle/ DTC's P0507/P2279/P2187



01 MIL on, engine stalls or idles erratically immediately after cold start in extremely cold weather (below 20锟斤拷F)



17 09 16



2021443/2



December 1, 2009



Affected Vehicles



126



Condition



Weather is extremely cold (below 20锟斤拷F or -6.7锟斤拷C), and one of the following conditions is present:



^ MIL on. Possible DTCs (P0507, P2279, or P2187).



^ Uneven idle or engine immediately stalls prior to shifting out of Park at first cold start. Engine operation normal after warm-up.



Technical Background



It is normal for condensed water to accumulate in the engine oil during extended periods of cold weather (below freezing) and excessive vehicle



short-trip operation. This water usually evaporates when the engine reaches operating temperature and exits through the crankcase ventilation



system.



However, if the vehicle is mainly used for short trips and the engine does not reach operating temperature, an excessive amount of condensed water



may collect in the crankcase pressure regulating valve and freeze over night (Figure 1). This could lead to a temporary malfunction of the crankcase



pressure regulating valve on cold engine start and result in a rough idle or engine stall until warm crankcase gases melt the ice.



A special winter pressure regulating valve is available for vehicles in cold weather regions operated under extended short trip conditions and



exhibiting the above symptoms.



Tip: This condition only occurs when ambient air temperatures fall below freezing and allow residual water buildup in the crankcase pressure



regulating valve to freeze.



Production Solution



Service



1. Remove the oil filler cap and check for moisture.



If the oil filler cap is heavily coated with grey or white foam, a large amount of water is present in the engine oil.



2. Remove the crankcase pressure regulating valve and check for presence of ice or excessive moisture buildup.



3. Check the part number of the crankcase pressure regulating valve. If the part number of the crankcase pressure regulating valve is 06F 129 101E,



replace with 06F 129 101M.



Note:



Install part number 06F 129 101M only if the removed part number is 06F 129 101E. Damage could occur.



4. Replace the engine oil and filter.



5. Erase any DTCs, if present.



127



6. Perform test drive and verify repair.



Warranty



Required Parts and Tools



Required Tool:



VAS 5051B/5052



Additional Information



All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service



manuals for the latest information.