Monday, July 26, 2021

2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 859


- Ambient temperature:Warning! Communication with ECU required.



Specified value



- The intake air temperature may be max. 5锟斤拷 C below the ambient temperature or 15锟斤拷 C above the ambient temperature.



Question



- Is the actual value for intake air temperature OK?



YES



The actual value is okay.Further procedure



- If only fault codes 1599 and 1600 occur in control unit ME-SFI, erase the fault memory.



- The component may not be replaced.



End of test



NO



The actual value is not o.k.Possible cause and remedy



- Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module N3/10 (ME-SFI [ME] control unit).



- Check internal resistance of component B2/5b1 (Intake air temperature sensor).



1.2. Check plausibility of actual value B2/5b1 (Intake air temperature sensor) in control module ME 9.7.



Image legends



- Picture1



- B2/5 (Hot film mass air flow sensor)



- Connector (5-pin)



- Picture2



- B2/5 (Hot film mass air flow sensor)



- Connector (4-pin)



Test prerequisite



- The actual value is not o.k.



Test sequence



- Detach coupling at component B2/5 (Hot film mass air flow sensor).



- Switch on ignition.



Status of relevant actual value:



- Intake air temperature:Warning! Communication with ECU required.



Specified value



- If the connector is unplugged at component B2/5b1 (Intake air temperature sensor), value [ -40锟斤拷 C ] is displayed.



- Bridge pin 2 in pin 3 at the unplugged connection of component B2/5b1 (Intake air temperature sensor).The value is approx. [ 150锟斤拷 C ] for a



short period of time and drops back down to the substitute value of approx. [ -40锟斤拷 C ].



Question



- Is the actual value o.k.?