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 | GF07.07-P-4118G | |
| Engine 111 (except engine 111 EVO) | |||
| Engine 111 EVO | GF07.07-P-4118GS | ||
| Engine 119, 120 (round connector) | GF07.07-P-4118E |