ME-SFI two-sensor control function - GF07.61-P-3020F
ENGINE 104.941 /943 /944 /991 /994 as of 1.8.96 with CODE (494a) USA version
ENGINE 104.995 with CODE (494a) USA version
ENGINE 111.921 /942 as of 1.9.98, 111.943, 111.944 as of 1.8.96, 111.946 as of 1.6.98, 111.947 /973, 111.975 as of 1.8.96 with CODE (494a) USA version
ENGINE 111.945 in MODEL 202.020 /080 as of 1.9.98, 208.335 /435 as of 1.6.98 with CODE (494a) USA version
ENGINE 111.951 /952 /955 /956 /957 /958 /982 /983
ENGINE 111.974, 112.970 /972 with CODE (494a) USA version
ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /973 /975 with CODE (925) low emission EURO3 with CODE (926) low emission EURO4 with CODE (494a) USA version
ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969 with CODE (925) low emission EURO3 with CODE (926) low emission EURO4 with CODE (494a) USA version
ENGINE 119.980/981 /982 /985 with CODE (494a) USA version
ENGINE 120.982 /983 with CODE (494a) USA version
ENGINE 137.970
Task
- Improving the stability of the lambda control.
- Monitoring the O2 sensor upstream of TWC
The engine control unit calculates the lambda mean value from the signals supplied by the oxygen sensor downstream of TWC. This value is compared with a stored value for optimum exhaust emissions. If the variation of several measurements is too large, a correction variable (lag time ± TV) is determined for the lambda control.
Use of the correction factor (value for a new O2 probe about 0) allows one to compensate for aging of the O2 probe upstream of the catalytic converter within certain limits. If the correction variable exceeds the limit value, the oxygen sensor upstream of the TWC must be replaced.
In addition, allowance is made for the period of the signal supplied by the sensor upstream of TWC. If no sensor state change takes place, the lambda control is not active and no two-sensor control is therefore possible either.
The effect of the three-way catalytic converter is monitored with the oxygen sensor signals downstream of TWC.
| Motor electronics control unit, location/task/design/function | other than engine 111 EVO | GF07.61-P-5000F | |
| Engine 111 EVO | GF07.61-P-5000GS | ||
| O2 sensors, location/task/design/function | GF07.04-P-4103F | ||
| Three-way catalytic converter location/task/design/function | GF49.10-P-3002F |