Overheating/pinging protection, function - GF07.61-P-4027M

ENGINE 275.950 in MODEL 215, 220 

ENGINE 275.951 in MODEL 230 

ENGINE 275.953 in MODEL 216, 221 

ENGINE 275.954 in MODEL 230 

ENGINE 275.980 in MODEL 215, 220 

ENGINE 275.981 in MODEL 230 

ENGINE 275.982 in MODEL 216, 221 

ENGINE 285.950 in MODEL 240 

ENGINE 285.980 in MODEL 240 

The task of the overheating/pinging protection is to prevent engine damage as a result of excessive thermal overload and overheating damage of the catalytic converters.

At high engine load and coolant temperature, the ignition timing point is retarded corresponding to the rotational speed and load and the throttle valve is no longer opened completely.

The ignition timing point adjustment begins at approx. 90°C coolant temperature. The timing correction towards "late" is performed by the ME-SFI control unit (N3/10) in accordance with the performance map The following information is processed in the ME-SFI control unit for this purpose:

• Engine speed
• Boost air temperature
• Coolant temperature
• Signal from pressure sensor downstream of throttle valve actuator (load detection)
• Signal from pressure sensor upstream of throttle valve actuator (boost pressure)

The ignition angle corrections of the overheating/pinging protection functions and anti-knock control are added based on the performance map.

	ME-SFI control unit, location/task/design/function		GF07.61-P-5000M
	Coolant temperature sensor, location/task/design/function		GF07.04-P-5026M
	Crankshaft position sensor, location/task/design/function		GF07.04-P-4116M
	Pressure sensor upstream of throttle valve actuator, location/task/function		GF07.04-P-5048M
	Pressure sensor downstream of throttle valve actuator, location/task/function		GF07.04-P-5049M
	Charge air temperature sensor, location/task/function		GF07.04-P-5038M
	Throttle valve actuator, location/task/design/function		GF30.22-P-4101M
	ECI ignition system, function		GF15.15-P-3000M
	Boost pressure control, function		GF09.40-P-3000M