Intake air temperature correction function - GF07.61-P-4028KE
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 correction of the intake and charge air temperature is to reduce the thermal stresses on the engine at high temperatures of the intake air and charge air.
If the intake air temperature/charge air temperature is too high, ignition timing is adjusted at high "load" to "Late" (retarded).
The correction by retarding the ignition timing is map-controlled by the ME control unit.
It begins as of an intake/charge air temperature of approx. 35 °C and reaches its maximum at approx. 65 °C.
The ignition timing is retarded e.g.:
- at 35 °C intake/charge air temperature and full load < 3.5° crankshaft angle
- at 45 °C intake/charge air temperature and full load < 6.3° crankshaft angle
- at 65 °C intake/charge air temperature and full load < 9.5° crankshaft angle
The following information is processed in the ME-SFI control unit for this purpose:
- Intake/charge air temperature
- Engine speed and crankshaft position
- Throttle valve position
- Air mass and intake manifold pressure
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 | |
| Component description of hot film MAF sensor | 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 | |
| Component description of ignition coil | T1/1-T1/4 | GF15.10-P-2100KE | |
| Component description of throttle valve actuator | M16/6 | GF30.20-P-2020KE |