Idle speed control - fault code description ME - AD07.61-P-4000-24L

1	Fault code ( Readout on generic scan tool)	P202B Idle speed control implausible (P0507)
2	Fault storage	After expiry of test duration and fault
	Actuation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp	No actuation
3	Checking frequency	Continuous
4	Checked signal or status	Engine speed and throttle flap angle
5	Fault setting conditions	Requested idle speed exceeded by more than 200 rpm
	Upper limit value	Requested idle speed not reach by a difference of more than 100 rpm
	Lower limit value	Approx. 30 seconds
	Checking duration	If actuation of the actuator motor in the ME control unit actuator is altered the new specified value must be reached muss within about 25 seconds.
6	Check prerequisites	engine temperature greater than 45°C AC off limp-home not active no safety fuel switch-off throttle valve not iced up.
7		Engines 112, 113 If the engine control unit detects an undervoltage, the idle speed at the engaged drive position will be raised up to switching off of the ignition by approx. 100 rpm. When the air conditioning unit is switched on and the external temperature exceeds 35°C the idling speed for the driving position selected is increased by about 100 rpm to 700 rpm when the switch-on threshold of about 900 rpm is exceeded. This increase is canceled again when the external temperature drops below 32°C. Vehicles with SBC: If the SBC control unit reports an undervoltage to the engine control unit via the CAN, the idling speed for the driving position selected is increased to about 750 rpm.