Catalytic converter efficiency monitoring function - GF49.10-P-3033F

ENGINE MODEL 104.941 /991 /994 /995 with CODE (494) USA version

ENGINE 104.943 /944,111.975 as of 1.8.96 with CODE (494a) USA version

ENGINE 111.921 /942 as of 1.9.98 with CODE (494a) USA version

ENGINE 111.945 in MODEL 208.335 /435 as of 1.6.98, 202.020 /080 as of 1.9.98 with CODE (494a) USA version

ENGINE 111.944 947 /961 /973 /974 with CODE (494a) USA version

ENGINE 111.951 /952 /955 /956 /957 /958 /982 with CODE (925) low emission EURO3

ENGINE 111.983, 111.946 as of 1.6.98 with CODE (494a) USA version with CODE (925) low emission EURO3

ENGINE 112.910 /911 /920 /921 /922 /923 /940 /941 /942 /943 /944 with CODE (925) low emission EURO3 with CODE (926) low emission EURO4 with CODE (494a) USA version

ENGINE 112.912 /913 /914 /916 /917 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975

ENGINE 112.910 /911 /920 /921 /922 /940 /941 /942 /944 as of 1.6.00

ENGINE 113.940 /941 /942 /943 /960 /961 with CODE (494a) USA version with CODE (926) low emission EURO4 with CODE (925) low emission EURO3

ENGINE 113.940 /941 /942 /943 /960 as of 1.6.00, 113.948 /963 /965 /966 /967 /968 /969

ENGINE 119.980 /981 /982 /985 with CODE (494a) USA version

ENGINE 120.982 /983 with CODE (494a) USA version

ENGINE 137.970

Shown on engine 104

Fig 1: Catalytic Converter Efficiency Monitoring Function - Shown On Engine 104

Task

Detecting catalytic converters with insufficient efficiency and operating engine diagnosis indictor lamp (EURO3/4) or CHECK ENGINE (MIL).

Design/function

When the catalytic converter is at operating temperature and the lambda closed-loop control is activated, the O₂ sensor signal downstream of TWC is compared with the lambda closed-loop control is activated, the O₂ sensor signal downstream of TWC is compared with the O₂ sensor signal upstream of TWC. The amplitude of the O₂ sensor voltage downstream of TWC must be less than the amplitude of the O₂ sensor voltage upstream of TWC (Note: E.g. if no monolith was built into the catalytic converter, the O₂ sensor signals upstream or downstream TWC would be identical).

The catalytic converter is evaluated on the basis of its ability to store oxygen. Several measurements must be performed in the specified engine speed and load range. The results are compared with a map the catalytic converter is evaluated on the basis of its ability to store oxygen. Several measurements must be performed in the specified engine speed and load range. The results are compared with a map and a fault is detected in this way.

Motor electronics control unit, location/task/ design/function		GF07.61-P-5000F
Motor electronics control unit, location/task/ design/function	M111 EVO	GF07.61-P-5000GS
HFM-SFI control unit, location/task/design/ function	Engine 104	GF07.51-P-4103D
O₂ sensors, location/task/design/function		GF07.04-P-4103F
Three-way catalytic converter location/task/ design/function		GF49.10-P-3002F