ME-SFI secondary air injection malfunction (causal chain) - fault code description - AD07.61-P-4000-15M

		Air injection malfunction (causal chain)
1	Fault code	P2003 (P0410)
	(Fault code according to OBD)	P2028 Right cylinder bank (P0410) P2029 Left cylinder bank (P0410)
2	Fault storage	After expiry of test duration and fault
	Actuation of indicator lamp for engine diagnosis (EURO4) or CHECK ENGINE (MIL)	Following two successive driving cycles with faults P2028, P2029: No actuation for EURO4
3	Checking frequency	once per driving cycle
4	Checked signal or status	Lambda control
5	Fault setting conditions	Increase of lambda regulation factor by at least +25% ("rich" stop)
	Checking duration	Approx. 10 seconds
6	Check prerequisites	Engine idling Vehicle stationary Air pump activated at least once after engine start No fault on voltage supply to purge control valve, air pump switchover valve and electric air pump No fault in purge system No fault in throttle valve actuator No misfiring No fault in O2 sensor upstream of TWC, aging No fault in CAN data bus No fault in activated charcoal canister shut-off valve Self-adaptation of the mixture formation not at limit Air pressure over approx. 780 hPa (i.e. no test is performed above an altitude of approx. 2500 meters) Coolant temperature higher than 50°C Lambda control enabled AC off.
7	Check procedure	On starting the causal chain, all functions for self-regulation of mixture adjustment are locked, the switchover valve for regeneration is closed and the current lambda controlling factor recorded. This is followed by air injection. The mixture must be made leaner. The lambda control factor reacts in a corresponding manner with an increase of more than +25 %.
8		If a prerequisite changes during the test, the test is interrupted and started again later. A fault is also issued of actuation of the electric air pump is faulty.