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#1
02-04-2011, 10:45 AM
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m117 Fuel Pump Relay Randomly Turning Off ???
Hey everyone,
My buddy's 560SEL's fuel pumps keep randomly turning off.  The relay is new, we recently replaced the 12-pole connector as well. All the wires have are cleaned up and there isnt anything contacting out. The OVP is new as well also.What would cause the relay to turn off?
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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! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 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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#2
02-04-2011, 11:51 AM
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Overheating (excessive current draw from pumps) OR lack of RPM signal from EZL
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MERCEDES Benz Master Guild Technician (6 TIMES) 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) Retired Moderator
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#3
02-04-2011, 12:03 PM
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I checked the current draw to the pumps not to long ago, it was around 6.7-7amps.
What would cause the rpm signal from the EZL to cease functioning? Is there not a connection to the starter lock out (NSS) as well? I did notice the other day the he could start the car in drive?!
__________________
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! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 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 Last edited by JamesDean; 02-04-2011 at 12:28 PM.
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#4
02-04-2011, 02:25 PM
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Tried to start it when I got to it today. No Go. Unplugged the relay got a meter on the thing. When I first checked there was only 4V @ the relay turn on pins (triggered by ignition switch) I thought this was odd. I double checked, said 4..plugged in the relay (ignition still on) and the relay click, pumps kicked on for a second...then off..and the car started fine.
I checked the voltage at the turn on pins again and this time it said battery voltage..odd. The TD signal was fine as well it was around 9v at idle. Spec is 6-12v. I found a TSB about dirty connections at the EZL and I sprayed some cleaning stuff. Odd stuff.
__________________
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! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 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
02-04-2011, 03:51 PM
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Power supply on pin 30 (large red wire) comes directly from un-fused connection near the battery.
Connector is X4/10 & supplies un-fused power to alternator & ignition switch as well.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) 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) Retired Moderator
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#6
02-04-2011, 04:42 PM
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Hm, I cleaned all the connections with some cleaner there was some crud on the EZL connections. Perhaps one of them was causing the TD signal to drop out.
For now, problem solved. We'll see over the coming weeks though.
__________________
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! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 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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