B4/3 (Fuel tank pressure sensor) : Short circuit to positive (P0451)

B4/3 (Fuel tank pressure sensor) : Short circuit to positive (P0451)
B4/3 (Fuel tank pressure sensor) : Short circuit to positive (P0451)
Possible cause:
­ B4/3 (Fuel tank pressure sensor)
Affected functions:
­
Fuel system
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Test 1: Check component B4/3 (Fuel tank pressure sensor). ( Valid for (USA) )
1. Check component B4/3 (Fuel tank pressure sensor). ( Valid for (USA) )
Test 1.1: Check component B4/3 (Fuel tank pressure sensor) by means of actuation.
Test 1.2: Check power supply of component B4/3 (Fuel tank pressure sensor).
1.1. Check component B4/3 (Fuel tank pressure sensor) by means of actuation.
Figure legend
­ 019Vacuum tester
­ bPurge line from activated charcoal canister to component Y58/1 (Purge control valve)
­ Y58/1 (Purge control valve)
Test sequence
­
­
­
­
Switch off ignition.
Detach purge line to activated charcoal filter at component Y58/1 (Purge control valve) and connect vacuum tester to purge line.
Switch on ignition.
Actuate component Y58/4 (Activated charcoal canister shut­off valve).(Operate pushbutton F2.)2010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Warning!Communication with ECU required.
1.2. Check power supply of component B4/3 (Fuel tank pressure sensor).
Figure legend
­ A ­ConnectionTest cable 35­pin socket box
­ 001 ­Sockets of component N3/10 (ME­SFI [ME] control unit)
­ 05 ­35­pin socket box
­ 050 ­126­pin socket box
­ 108 ­Test cable 266 589 01 63 00
­ N3/10 (ME­SFI [ME] control unit)
­ II 1­63ConnectionTest cable
­ III 64­126ConnectionTest cable
Warning!
­
­
Connection A of test cable 108 may NOT be connected to connection B of the 126­pin socket box (050).
Page 8202010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 821
Test prerequisite
­ The actual value is not o.k.
­ The power supply of component N3/10 (ME­SFI [ME] control unit) is OK.
Test sequence
­ Switch off ignition.
­ Connect socket box (126­pin) to component N3/10 (ME­SFI [ME] control unit).
­ Measure direct voltage with multimeter between sockets [ F.9 ] 105 and [ F.22 ] 118 of the 126­pole socket box tester.
­ Switch on ignition.
Specified value
­ Voltage[4.7...5.3] V
Question
­
Is the measurement value OK?
YES
The measurement value is OK.Further possible causes of fault
­ Check lines from component N3/10 (ME­SFI [ME] control unit) to component B4/3 (Fuel tank pressure sensor).
­ B4/3 (Fuel tank pressure sensor)
End of test
NO
The measurement value is not OK.Possible cause and remedy
­ Check lines from component N3/10 (ME­SFI [ME] control unit) to component B4/3 (Fuel tank pressure sensor).
­ N3/10 (ME­SFI [ME] control unit)
End of test