ENGINE   113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969 ENGINE   137.970

Shown on Engine 119 B2/5 Hot film MAFsensor B11/4 Coolant temperature sensor B17 Intake air temperature sensor L5 Crankshaft position sensor M16/1 Electronic accelerator (EA)/ cruise control (CC)/ idle speed control (ISC) actuator N3/10 ME-SFI control unit T1/1- T1/8 Ignition coils, cylinder 1 to 8
		P07.61-0402-06

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		GF07.61-P-5000F
	Coolant temperature sensor, location/task/design/function	Engine 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 113, 137	GF07.07-P-4118G