Electric suction fan, ME-SFI fault code description - AD07.61-P-4000-71L

		Electric suction fan, actuation
1	Fault code ( Display on generic scan tool)	P2073 (-)
1B	Engine 112, 113 as of 1/01	P2073-[1] Short circuit to positive (-)
	Fault code	P2073-[2] Short circuit to ground(-)
	( Display on generic scan tool)	P2073-[4] Interruption (-)
2	Fault storage	After expiry of test duration and fault
	Activation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp	No activation
3	Checking frequency	Continuous
4	Checked signal or status	PWM signal actuation and voltage supply for electric suction fan.
5	Fault setting conditions
	Short circuit to positive	Fault if the duty cycle is greater than 90 %.
	Short circuit to ground	Fault if the duty cycle is lower than 10 %.
	Interruption	PWM signal actuation missing. Voltage supply (circuit 30) to electric suction fan interrupted.
6	Check prerequisites	Battery voltage between 8 and 17 V
7		In the event of a fault, the output stage is locked or switched for further troubleshooting. A short circuit to ground and a line interruption will be detected when the output stages are locked, while a short-circuit to positive is detected when the output stages are conducting. In the event of a fault in the actuation signal of the electrical suction fan, the fan is automatically switched to maximum speed. The suction fan is actuated via the suction fan control unit or via integrated control at the suction fan. Pay attention to the variant coding of the AAC or comfort AAC control and operating units.