ME-SFI two-sensor control - function - GF07.61-P-3020BK
ENGINE 113.967 in MODEL 219
ENGINE 113.964 in MODEL 164.1
ENGINE 113.971 in MODEL 251
Shows model 219
The ME engine control unit determines the lambda mean value from the signals of 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 oxygen sensor upstream of the TWC must be replaced.
The correction values are map-controlled and are implemented by the ME control unit by adapting the fuel injection.
Two sensor control is only enable when the catalytic convertors have reached their operating temperature and the O2 sensors downstream 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 three-way catalytic converter is monitored by means of the O2
sensor signals downstream of the TWC.
| Component description for the O2 sensor | GF07.04-P-6100BK | ||
| Component description for the engine electronics control unit | GF07.61-P-6000BK | ||
| Component description for the engine diagnosis indicator lamp | Except |
GF54.30-P-5010BK | |
| Component description for the "CHECK ENGINE" MIL | GF54.30-P-5011BK | ||
| Component description for the fuel injection valves | GF07.03-P-6010BK | ||
| Component description for the three-way catalytic converter | GF49.10-P-2010BK |