Fault code description for activated charcoal canister shutoff valve, ME-SFI - AD07.61-P-4000-20A

1	Fault code	P0446
2	Fault storage	after the end of the test period and faults
	Activation "CHECK ENGINE" malfunction indicator lamp (MIL)	after two successive driving cycles with faults
3	Frequency of the test	continuous
4	Checked signal or status	Voltage and current for activated charcoal canister shutoff valve
5	Fault setting conditions  Limits
	Short circuit to ground	Voltage < 4 V
	Short circuit to +12 V	Current < 4.2 A
	Line interruption	no voltage at the activated charcoal canister shutoff valve approx. 4 - 8 V at unloaded output of ME-SFI control module
	Test duration	approx. 1 s
6		The activation of the activated charcoal canister shutoff valve is tested for line interruption and short circuit (to ground or battery voltage). Short circuit to ground and line interruption is determined with a blocked output stage, whereas short circuit to battery voltage is determined with a conducting output stage. In the event of faults, the output stage is immediately no longer activated.