Secondary air injection function - GF14.30-P-3012E
ENGINE 104.941, 104.943 /944 /991 /994 as of 1.8.96
ENGINE 104.995 with CODE (494a) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998 with CODE (498) as of Model Year 97 Japanese version
ENGINE 111.973, 111.975 as of 1.8.96
ENGINE 111.974 with CODE (494a) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998
ENGINE 119.980 /981 /982 /985 with CODE (491) U.S. version with CODE (923a) low emission D3 as of 12/96
Shown on Engine 119
The secondary air injection heats up the catalytic converter more rapidly to its operating temperature and thus improves the emission levels in the warming-up phase.
Function
The electric air pump (M33) is actuated through the secondary air injection relay (K17) The current consumption of the electric air pump (M33) is as much as 35 A.
Air injection relay and air pump switchover valve (Y32) are actuated simultaneously by the motor electronics control module for maximum 90 seconds after engine start, if:
- Coolant temperature > 10 °C and < 60 °C
- Engine speed < 3000 rpm
- Throttle valve not fully opened
After an actuation, the air injection remains deactivated until the coolant temperature has risen to more than approx. + 60 °C and then drops again to below 40 °C.
The pump draws in air through a maintenance-free filter and pumps it to the air shutoff valve. The valve at the same time prevents exhaust gases from flowing back to the air pump (check valve discontinued).
The air pump switchover valve passes on the intake manifold pressure to the aspirator shutoff valve (126). This opens and the air delivered by the air pump is pressed into the exhaust manifold.
The injected air reacts with the hot exhaust gases in the outlet port. An oxidation of carbon monoxides (CO) and hydrocarbon (HC) takes place and results in an additional increase in the exhaust temperature.
Engines with supercharger
The injected air is removed on the thrust side through the supercharger. An air pump is not required.
| ME-SFI control module position/task/design/function | Engine 104 and 111 (except HFM sequential multiport fuel injection/ignition system and M111EVO), engine 112, 113 (except 113.99) Engine 119.98, 120.98, 137, 275, 285 |
GF07.61-P-5000F | |
| Air pump, location/task/design/function | Engine 104, 111, 112, 113 (except 113.9), 119.98, 120.98, 137, 166, 275, 285 with air injection through air pump | GF14.30-P-3100F | |
| Supercharger location/task/design/function | Engine 111.943 /944 /973 /975 Engine 111.955 /956 /957 /958/983 |
GF09.50-P-3102G | |
| Crankshaft position sensor location/task/design/function | Engine 104 and 111 (except HFM sequential multiport fuel injection/ignition system) Engine 112, 113 (except 112.96, 113.99) Engine 119.98, 120.98, 137, 166, 275, 285 |
GF07.04-P-4116F | |
| Coolant temperature sensor location/task/design/function | Engine 104, 111 (except HFM sequential multiport fuel injection/ignition system) | GF07.04-P-5026G | |
| Engine 119.98, 120.98 | GF07.04-P-5026F | ||
| Air shutoff valve location/task/function | Engine 104, 111, 112, 113 (except 113.9), 137, 166, 275, 285 with air injection | GF14.30-P-4028F | |
| Check valve (injected air), location/task/design/function | Engine 104.94/99, 111, 119.98, 120.98, 271KE with air injection | GF14.30-P-4029F | |
| Electronic accelerator/cruise control/idle speed control actuator location/task/design/function | Engine 104 and 111 (except HFM sequential multiport fuel injection/ignition system and M111EVO) Engine 112, 113 (except 113.99) Engine 119.98, 120.98, 137, 275, 285 |
GF30.22-P-4010F | |
| Lambda control function | Engine 104, 111 (except HFM sequential multiport fuel injection/ignition system), 112, 113 (except 113.99), 119.98, 120.98, 137, 275, 285 | GF07.61-P-4022F | |
| Air pump switchover valve, location/task/design/function | Engine 104, 111 ME, 119, 120 with air injection through air pump | GF14.30-P-3103F | |
| Base module location/task/design/function | Model 129, 140 | GF54.21-P-4013L | |
| Secondary air injection relay location/task/design/function | Engine 104, 111, 112, 113 (except 113.9), 119.98, 120.98, 137, 166, 275, 285 with air injection through air pump | GF14.30-P-3101F | |
| Relay module position/task/design/function | Model 210 up to 2/97 Model 170 |
GF54.10-P-4033K | |
| Fuse and relay module | Model 202, model 210 as of 3/97: air injection relay integrated | ||
| Three-way catalytic converter location/task/design/function | Vehicles with catalytic converter technics Engine 104, 111, 112, 113, 119, 120, 137, 166, 271, 275, 285 |
GF49.10-P-3002F |