Self-adaptation of mixture formation at its limit -fault code description ME-SFI - AD07.61-P-4000-09AB

		Self adaptation of the mixture formation is at the limit value, in idle
1A	Fault code	P2017 for the right cylinder bank (P0170)
1A	( Readout on generic scan tool)	P2086 for the left cylinder bank (P0173)
1B	Engines 112, 113 as of 1/01	P2017-[1] for the right cylinder bank, mixture correction too great (P0170)
	Fault code	P2017-[2] for the right cylinder bank, mixture correction too small (P0170)
	( Readout on generic scan tool)	P2086-[1] for the left cylinder bank, mixture correction too great (P0173) P2086-[2] for the left cylinder bank, mixture correction too small (P0173)
2	Fault storage Actuation of the indicator lamp	after expiry of test duration and fault
2	Engine diagnosis (EURO3/4) CHECK ENGINE (MIL)	no actuation following two successive driving cycles with faults
3	Checking frequency	Continuous
4	Checked signal or status	Limits for self adaptation of mixture formation
5	Fault setting conditions	Approx. ± 1.0 ms (equivalent to approx. 40% of the injection time in idle)
	Limit value, additive correction	Factor 0.7 up to 1.3
	Limit value, multiplicative correction	The injection time must be reduced by more than 30% (in idle by more than 1 ms) (lean stop).
	Mixture too rich.	The injection time must be extended by more than 30% (in idle by more than 1 ms) (rich stop).
	Mixture too lean. Checking duration	At least 400 seconds.
6	Check prerequisites	lambda control enabled function of self adaptation of mixture formation enabled coolant temperature greater than 70°C no engine oil dilution due to fuel no fault on coolant temperature sensor, hot film MAF sensor, O₂ sensors, air injection and leaktightness of the purge system .
7		In order to determine a new value for the mixture formation self adaptation, it is necessary to undertake a journey of approx. 20 minutes with enabled lambda control.

Self adaptation of mixture formation

Fig 1: Identifying Self-Adaptation Of Mixture Formation Graph

Courtesy of MERCEDES-BENZ USA