Air injection, function - GF14.30-P-3012AM
ENGINE 113.990 in MODEL 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230 up to Model Year 2008
ENGINE 113.993 in MODEL 463 up to 31.5.12
ENGINE 113.995 in MODEL 230 up to Model Year 2008
The air injection more rapidly warms up the catalytic converters to operating temperature after starting and thus improves the exhaust emission values in the warming-up phase.
The injected air is prepared by the electric air pump with released air injection. The electric air pump is actuated by the ME-SFI [ME] control unit via the following relays:
Models 211, 219 K17 Air injection relay
Model 215, 220 K40/7kN Air pump relay
Model 230 K40/4kN Air pump relay (up to 06/2002)
K40/4kO Air pump relay (from 07/2002)
Model 463 N10/1kO Secondary air pump relay
The air pump switchover valve is actuated simultaneously by the ME control unit at the ground end.
The air injection is actuated for maximum 150 seconds after engine start, if:
- Coolant temperature > -10°C and < 60°C
- Engine speed <3000 rpm
- Throttle valve is not fully open (no full-load range)
Function
The air pump switchover valve switches the intake manifold vacuum (a) through to the aspirator shutoff valves (126/1, 126/2) on the left and right. These open and the injected air (b) from the electric air pump is blown into the exhaust ducts of the cylinder heads (c).
The injected air reacts with the hot exhaust gases in the outlet ducts. An oxidation of carbon monoxide (CO) and hydrocarbon (HC) takes place (afterburning).
This afterburning (exothermic reaction) leads to a further increase in the exhaust gas temperature, which additionally heats the catalytic converters.
| Fuel injection valve, location/task/design/function | GF07.03-P-5004KE | ||
| Crankshaft position sensor, location/task/design/function | GF07.04-P-4116AM | ||
| Pressure sensor, location/task/design/function | GF07.04-P-5014AM | ||
| Coolant temperature sensor, location/task/design/function | GF07.04-P-5026AM | ||
| Charge air temperature sensor, location/task/design/function | GF07.04-P-5039AM | ||
| ME-SFI control unit, location/task/design/function | GF07.61-P-5000AM | ||
| Electric air pump Location/task/design/function | GF07.61-P-5003AM | ||
| Air pump switchover valve, location/task/design/function | GF14.30-P-3103HA | ||
| Air pump relay location/task/design/function | GF14.30-P-3106AM | ||
| Air shutoff valve, location/task/function | GF14.30-P-4028HA | ||
| Check valve vacuum location/task/design/function | GF14.30-P-4032HA | ||
| Accelerator pedal sensor, location/task/design/function | GF30.20-P-4010HA | ||
| Throttle valve actuator, location/task/design/function | GF30.22-P-4101AM |