Monday, December 10, 2018

2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 3278


1.2. Check power supply of component B4/7 (Fuel pressure sensor).



Test prerequisite



- The actual value is not o.k.



Test sequence



- Switch off ignition.



- Unplug connector of pressure sensor B4/7 (Fuel pressure sensor).



- Measure direct voltage with multimeter between sockets (B4/7) 3 and (B4/7) 1



- Switch on ignition.



Specified values



- Voltage : [4.8 ... 5.3] V



Question



- Is the measurement value OK?



YES



The measurement value is OK.Further possible causes of fault



- Inspect plug connections for corrosion, pinched insulation and loose contact.



End of test



NO



The measurement value is not OK.Possible cause and remedy



- Test wiring of voltage supply between component N118 (Fuel pump control module) and component B4/7 (Fuel pressure sensor).



- Inspect plug connections for corrosion, pinched insulation and loose contact.



End of test



1.3. Test wiring to component B4/7 (Fuel pressure sensor).



Test prerequisite



- The actual value is not o.k.



Test sequence



- Switch off ignition.



- Unplug 8-pin connector from control module N118 (Fuel pump control module).



- Disconnect connector at component B4/7 (Fuel pressure sensor).



Open circuit



- (N118) 2.Measure resistance with multimeter between sockets 6 and 3 (B4/7)



- (N118) 2.Measure resistance with multimeter between sockets 7 and 2 (B4/7)



- (N118) 2.Measure resistance with multimeter between sockets 8 and 1 (B4/7)



- Specified values



- Resistors< 1ohms



-



Short circuit



- Test cable to component B4/7 (Fuel pressure sensor) for short circuit to each other.



- N118.2.6



- N118.2.7



- N118.2.8



- Specified values



- Resistorsinfiniteohms

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