Exhaust gas recirculation malfunction (function chain), ME-SFI fault code description - AD07.61-P-4000-50AA

		Exhaust gas recirculation malfunction (function chain)
1	Fault code ( Readout on generic scan tool)	P2001 (P0400)
2	Fault storage	After expiry of test duration and fault
	Actuation of the indicator lamp
	Engine diagnosis (EURO3/4)	No actuation of indicator lamp
	CHECK ENGINE (MIL)	Following two successive drive cycles with faults
3	Checking frequency	Once per drive cycle
4	Checked signal or status	Intake manifold pressure
5	Fault setting conditions	The vacuum in the intake manifold must drop during exhaust gas recirculation by at least 54 mbar (engine 112) or at least 38 mbar (engine 113).
	Checking duration	approx. 3 seconds
6	Check prerequisites	No fault in electrical actuation of EGR [ARF] pressure transducer No fault in intake manifold pressure sensor Overrun fuel shutoff active Engine speed around 900 to 1700 rpm and constant Altitude below 2500 meters
7		If the prerequisites are present, the intake manifold pressure is measured and then exhaust gas recirculation actuated briefly.