ME-SFI two-sensor control, function engine 272 - GF07.61-P-3020V
ENGINE 272.942 in MODEL 171
ENGINE 272.963 in MODEL 171
The ME engine control unit determines the lambda mean value from signals from the O2 sensors downstream of TWC. This value is compared with a stored value for optimum exhaust emissions.
If the deviation is too large after a number of measurements, a correction variable (delay time) is determined for the lambda control. The correction variable (value for new O2 sensor upstream TWC approx. 0) makes it possible to compensate for aging of the O2 sensor upstream of TWC within certain limits. If the correction variable exceeds the limit value, the O2 sensor upstream of TWC must be replaced.
The correction values are map-controlled and are implemented by the ME-SFI [ME] control unit by adapting the fuel injection.
Two sensor control is only enabled when the catalytic convertors have reached their operating temperature and the O2 sensors downstream of TWC are correct.
If the limit values are exceeded or the plausibility check of the O2 sensor signals is negative, a fault is stored in the fault memory.
The stored faults can be read out and erased with the STAR DIAGNOSIS.
The effect of the firewall catalytic converters is monitored based on the O2
sensor signals downstream of TWC.
| Component description for the ME-SFI [ME] control unit | GF07.61-P-6000V | |
| Component description for | O2 sensors | O2 sensors upstream of the TWC GF07.04-P-6100V |
| O2 sensors downstream of the TWC | GF07.04-P-6100VA | |
| Component description for the three-way catalytic converter | GF49.10-P-2010V | |
| Component description for the "CHECK ENGINE" indicator lamp | GF54.30-P-5011V | |
| Component description for the engine diagnosis indicator lamp | GF54.30-P-5010V | |
| Component description for the fuel injection valves | GF07.03-P-6010V |