Overheating/pinging protection, function - GF07.61-P-4027KE
ENGINE 271.921 in MODEL 203
ENGINE 271.940 in MODEL 203, 209
ENGINE 271.941 in MODEL 211
ENGINE 271.944 in MODEL 171
ENGINE 271.946 in MODEL 203
ENGINE 271.948 in MODEL 203
ENGINE 271.955 in MODEL 209
ENGINE 271.956 in MODEL 211
The task of the overheating/pinging protection is to protect against engine damage as a result of excessive thermal overload and overheating damage of the catalytic converters.
If the coolant temperature/charge air temperature is too high, the ignition timing point is retarded in line with engine speed and load. The correction by retarding the ignition timing is map-controlled by the ME control unit.
The retardation of the ignition timing point commences at a coolant temperature of approx. 90 °C and a charge air temperature of approx. 20 °C.
The ignition timing is retarded e.g.:
- at 100 °C coolant, 20 °C charge air and full load → 2° crank angle
- at 100 °C coolant, 60 °C charge air and full load → 8° crank angle
- at 125 °C coolant, 60 °C charge air and full load → 1° crank angle
The following information is processed in the ME control unit for this purpose:
- Engine speed and crankshaft position
- Intake manifold pressure and air mass
- Intake/charge air temperature
- Coolant temperature
- Throttle valve position
The ignition angle corrections of the coolant temperature, intake/charge air temperature and anti-knock control are added in line with the performance map.
| Crankshaft position sensor, component description | L5 | GF07.04-P-6010KE | |
| Coolant temperature sensor, component description | B11/4 | GF07.04-P-6040KE | |
| Pressure sensor, component description | B28 | GF07.04-P-6060KE | |
| Intake air temperature sensor, component description | B17 | GF07.04-P-6070KE | |
| Hot film MAF sensor, component description | B2/5 | GF07.07-P-6000KE | |
| ME-SFI [ME] control unit, component description | N3/10 | GF07.61-P-6000KE | |
| Spark plugs, component description | R4 | GF15.10-P-2000KE | |
| Ignition coil, component description | T1/1-T1/4 | GF15.10-P-2100KE | |
| Throttle valve actuator, component description | M16/6 | GF30.20-P-2020KE |