Catalytic converter efficiency monitoring function - GF49.10-P-3033AM
ENGINE 113.990 in MODELS 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230
ENGINE 113.993 in MODEL 463
ENGINE 113.995 in MODEL 230
The firewall catalytic converters are assessed concerning their capacity to store oxygen. When the firewall catalytic converters are at operating state temperature and the lambda control has been enabled, the amplitude of O2 sensor signals downstream of the firewall catalytic converters are compared with the O2 sensor signal upstream of the firewall catalytic converters.
Changes in the oxygen content downstream of the firewall catalytic converters are almost completely dampened by the high oxygen storage capacity of the firewall catalytic converters.
This results in the O2 sensor signal downstream of the firewall catalytic converters being virtually constant (small amplitude).
If the firewall catalytic converter is no longer operational, the O2 sensor signal upstream and downstream of the firewall catalytic converters will be equal.
Several measurements must be performed in the specified engine speed and load range. The results are compared with a performance map from the ME-SFI [ME] control unit and recognized error are stored in the fault memory.
If a fault is detected, the engine diagnosis indicator lamp or
the "CHECK ENGINE" MIL is lit on the instrument cluster.
The stored faults can be read out and deleted with STAR DIAGNOSIS.
| O2 sensors - location/task/design/function | GF07.04-P-4103AM | ||
| ME-SFI control unit - location/task/design/ function | GF07.61-P-5000AM | ||
| Exhaust system - location/task/design/ function | GF49.00-P-2000AM | ||
| Three-way catalytic converter - location/task/ design/function | GF49.10-P-3002AM | ||
| "CHECK ENGINE" MIL - location/task/function At | GF54.30-P-4101AM | ||
| Engine diagnosis malfunction indicator lamp - location/task/function | except |
GF54.30-P-4102AM |