Mixture Preparation For Self Adaptation

WARNING: This page is about a different car, the 1996 Mercedes-Benz C220, 1995 Mercedes-Benz C220, and 1994 Mercedes-Benz C220. However, it is still accessible from the selected car via links, so may be relevant.

The Lambda control system determines fuel injection duration precisely so that the fuel/air ratio is kept constant at Lambda level 1 (equals 14.7 kg air to 1 kg fuel) under all operating conditions.

Should malfunctions occur in the form of:

Intake Air Leaks
Injector Wear or Carbon Build-Up
Engine Wear
Contact Resistance In MAF Sensor
Defective Diaphragm Pressure Regulator
Defective Purge Control Valve

The engine control module automatically performs a mixture adjustment. The degree of correction is calculated constantly and stored permanently. The self adaptation is performed at idle and under partial load. Maximum correction towards rich or lean is 25%. After repair work is performed, the engine control module will automatically adapt itself again after approximately 10 trips. After eliminating a malfunction or after trial installation of an engine control module from another vehicle, the self adaptation feature must be reset to its mean value.