Overheating/pinging protection function - GF07.61-P-4027F

ENGINE 104.941 /943 /944 /991 /994as of 1.8.96 

ENGINE 104.995 

with CODE (494a) USA version 

with CODE (807) Model year 1997 

with CODE (808) Model year 1998 

with CODE (498) as of Model year 97 Japanese version 

ENGINE 111.943 /947 /951 /952 /955 /956 /957 /958 /973 /982 /983, 

111.944/975 as of 1.8.96, 

111.946 as of 1.6.98, 

111.921/942 as of 1.9.98 

ENGINE 111.945 

in MODEL 208.335/435 as of 1.6.98, 

202.020/080 as of 1.9.98 

ENGINE 111.974 

with CODE (494a) USA version 

with CODE (807) Model year 1997 

with CODE (808) Model year 1998 

ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975 

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969 

ENGINE 119.980 /981 /982 /985 

ENGINE 120.982/983 

ENGINE 137.970 

Shown on Engine 119 

Task 

Preventing engine damage resulting from excessively high coolant temperature.

Design/function 

If the engine temperature is too high, the ignition timing point is retarded by the ignition system as an overheating and pinging protection. Activation of the pinging protection correction begins at a coolant temperature of approx. 100 °C and is active only when engine is under load.

The ignition timing is retarded e.g.:

e.g.: 100° C and full load → 0° crank angle later

105° C and full load → 1.4° crank angle later

120° C and full load → 3.2° crank angle later

The following information is processed in the ME-SFI control unit for this purpose:

• Engine speed/crankshaft position
• Air mass (boost pressure in supercharged engines)
• Coolant temperature.

The correction of the pinging protection and of the intake air are added together, a coolant temperature of e.g. 120 °C and an intake air temperature of 50 °C result in a maximum retardation of 11° crank angle at full load.

	Motor electronics control unit, location/task/ design/function	other than engine 111 EVO	GF07.61-P-5000F
		Engine 111 EVO	GF07.61-P-5000GS
	Coolant temperature sensor, location/task/ design/function	Engine 119, 120	GF07.04-P-5026F
		Engine 104, 111	GF07.04-P-5026G
		Engine 112, 113, 137	GF07.04-P-5026A
	Crankshaft position sensor, location/task/ design/function		GF07.04-P-4116F
	Hot film mass air flow sensor, location/task/ design/function	Engine 104, 112, 113, 137 Engine 111 (except engine 111 EVO)	GF07.07-P-4118G
		Engine 111 EVO	GF07.07-P-4118GS
		Engine 119, 120 (round connector)	GF07.07-P-4118E