Thursday, July 30, 2020

2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 972


Possible cause:



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



- M16/6 (Throttle valve actuator)



Affected functions:



- Engine diagnosis



- Engine output



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Test 1: Check component B2/5 (Hot film mass air flow sensor).



Test 2: Check component M16/6 (Throttle valve actuator).



1. Check component B2/5 (Hot film mass air flow sensor).



Test 1.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.



Test 1.2: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.



Test 1.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).



Test 1.4: Check power supply of component B2/5 (Hot film mass air flow sensor).



1.1. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.



Warning!Communication with ECU required.



1.2. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.



Warning!Communication with ECU required.



1.3. Check reference signal of component B2/5 (Hot film mass air flow sensor).



Test sequence



- Switch on ignition.



Status of relevant actual value:



- HFM-SFI ( Reference signal ):Warning! Communication with ECU required.



Specified value



- Reference signal[46...59] ms



Question



- Is the measurement value OK?



YES



The actual value is okay.End of test



NO



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



- Check lines from component N3/10 (ME-SFI [ME] control unit) to component B2/5 (Hot film mass air flow sensor).



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



1.4. Check power supply of component B2/5 (Hot film mass air flow sensor).



Image legends



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



- Connector (5-pin)



Test prerequisite



- The actual value is not o.k.