Secondary air injection relay, ME-SFI fault code description - AD07.61-P-4000-69M

		Air injection relay (K17, K40/4kO, K40/7kN, N10/1kA)
1A	Fault code ME2.7.1  (Fault code according to OBD)	P2023 (P0410)
1B	Fault code ME2.7.2	P2023-(1) Short-circuit to positive (P2258)
	(Fault code according to OBD)	P2023-(2) Short-circuit to ground (P2257) P2023-(4) Cable open-circuit (P2257)
2	Fault storage	After expiry of test duration and fault
	Actuation of engine diagnosis indicator lamp (EURO4) or CHECK ENGINE (MIL)	Following two successive driving cycles with faults
3	Checking frequency	Continuous
4	Checked signal or status	Current/voltage test at air injection relay
5	Fault setting conditions
	Short circuit to ground	Voltage lower than 4 volts
	Short circuit to positive	Current higher than 4.2 A
	Open circuit in wiring	No voltage at air injection relay ca. 4 to 8 V on the under no load output of the ME control unit
6	Check prerequisites	Battery voltage between 8 and 17 V
7		The actuation is checked for line interruption or short circuit (to ground or battery voltage). A short circuit to ground and a cable breakage will be recognized when the output stages are locked, while a short circuit to the battery voltage is recognized when the output stages are conducting. The output stage is no longer actuated immediately in the event of a fault.