12/3/19

2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) WWW.EBAAUTOPARTS.COM Page 1058

2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) WWW.EBAAUTOPARTS.COM Page 1058



- Switch on ignition.



Status of relevant actual value:



- Coolant temperature:Warning! Communication with ECU required.



- Intake manifold pressure (ADC):Warning! Communication with ECU required.



Specified values



- Coolant temperature > 80锟斤拷 C



- Intake manifold pressure,Ignition ON: > 3.5 V



- Intake manifold pressure,Operate engine at idling speed.:< 2 V



Question



- Is the actual value o.k.?



YES



The actual value is okay.End of test



NO



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



- Check power supply of component B28 (Pressure sensor).



- Test signal voltage of component B28 (Pressure sensor).



Further possible causes of fault



- Vacuum line



1.2. Check power supply of component B28 (Pressure sensor).



Figure legend



- B28 (Pressure sensor)



- 126/1 -'Secondary air injection left bank of cylinders' shutoff valve



Test prerequisite



- The actual value is not o.k.



Test sequence



- Switch off ignition.



- Detach coupling at component B28 (Pressure sensor).



- Measure direct voltage with multimeter between sockets (B28) 1 and (B28) 3



- Switch on ignition.



Specified value



- Voltage[4.75...5.25] V



Question



- Is the measurement value OK?

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