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  #1  
Old 02-14-2011, 10:59 AM
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Low Voltage Fuel Pump Relay Turn on pin

560sel

For some reason, randomly, my buddy's 560SEL will only output 4v to turn on the fuel pump relay (which is fails to actually turn on). We cant figure out why this is happening.

Anyone have any ideas?

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  #2  
Old 02-14-2011, 11:04 AM
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Which pin?? circuit 15 or 30?
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  #3  
Old 02-14-2011, 11:11 AM
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9) Pink/Black - Ignition Switch - Pin 15
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #4  
Old 02-14-2011, 11:30 AM
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According to the FSM, that is powered direct from the ignition switch (which is connected direct to battery) and also provides power to the following
1) Ignition Coil
2) EZL
3) OVP
4) All Warning Indicators
5) Fuel Pump Relay
6) Fuse 7
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #5  
Old 02-14-2011, 11:34 AM
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Could something on Fuse 7 be causing a problem? Hmr Perhaps not, if something was grounding out it should certainly blow that fuse...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #6  
Old 02-14-2011, 12:34 PM
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Just run a new wire directly from the back of the fuse box to the terminal of the fuel pump relay.
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44 years foreign automotive repair
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  #7  
Old 02-14-2011, 01:40 PM
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Quote:
Originally Posted by mbdoc View Post
Just run a new wire directly from the back of the fuse box to the terminal of the fuel pump relay.
Or replacing fuse 7.
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  #8  
Old 02-14-2011, 01:46 PM
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That is NOT a fused circuit, just a junction point for switched power.
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ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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  #9  
Old 02-14-2011, 01:55 PM
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Electrical Engineer
 
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Location: NE Ohio
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yes, just a junction. its most likely a loose wire. We'll probably just end up running a nice fresh line to the fuse box.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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