GF49.10-P-3033M Catalytic Converter Efficiency Monitoring - Function

GF49.10-P-3033M Catalytic Converter Efficiency Monitoring - Function
ENGINE 275.950 in MODEL 215, 220
ENGINE 275.951 in MODEL 230 up to Model Year 8
ENGINE 275.953 in MODEL 216, 221 up to Model Year 8
ENGINE 275.954 in MODEL 230 up to Model Year 8
ENGINE 275.980 in MODEL 215, 220
ENGINE 275.981 in MODEL 230 up to Model Year 8
ENGINE 275.982 in MODEL 216, 221 up to Model Year 8
ENGINE 285.950 in MODEL 240
ENGINE 285.980 in MODEL 240





158 Catalytic converter
A1 Instrument cluster
A1e26 "CHECK ENGINE" MIL (USA)
A1e58 Engine diagnosis indicator lamp
G3/3 Left O2 sensor, upstream TWC
G3/4 Right O2 sensor upstream TWC
G3/5 Left O2 sensor downstream TWC
G3/6 Right O2 sensor downstream of TWC
N3/10 ME-SFI control unit
X11/4 Data link connector

a O2 amplitude sensor signal upstream TWC
b Amplitude O2 sensor signal downstream of TWC

CAN Data bus

Each catalytic converter is evaluated on the basis of its ability to store oxygen. When the catalytic converter is at operating temperature and the lambda control is activated, the voltage signal of the O2 sensor downstream of TWC is compared with the O2voltage signal upstream of catalytic converter (amplitude size).
Because the catalytic converter has a high ability to store oxygen, the alteration of the oxygen content in line with the catalytic converter is fully dampened.
This has as a consequence, that the O2 voltage signal downstream of catalytic converter is constant (small amplitude).

If the catalytic converter is no longer operational, the O2 voltage signals upstream and downstream of catalytic converter are equal in size.

Several measurements must be performed in the specified engine speed and load range. The results are compared with a performance map in the ME-SFI control unit and faults detected are stored in the fault memory.

If a fault is detected, the engine diagnosis malfunction indicator lamp or CHECK ENGINE lights up in the instrument cluster.