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#1
11-02-2008, 10:06 PM
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'94 E 320 Engine Electrical Questions
My throttle operates with the key off, I'm thinking that it is not normal. What relay controls power to the throttle system? Where is the ground located?
TIA
__________________
 Gone to the dark side - Jeff 
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#2
11-03-2008, 08:16 AM
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On that car the accelerator cable attaches directly to the throttle actuator.
Even with the key off it will move the throttle butterfly. Even with ASR the butterfly will open 30-35% of the way with the key off.
__________________
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
11-03-2008, 09:09 AM
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It's a '94 E 320; HFM-SFI, electronic throttle.
Seems like the power to the HFM-SFI should be cut off with the key off. I just don't know what relay/switch to check first. Quote:
__________________
Gone to the dark side - Jeff
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#4
11-03-2008, 09:41 AM
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are you saying that the throttle assembly is buzzing while key off or just that the butterfly will open.as mbdoc said the linkage is directly connected to the throttle and will open partway so that the car will drive in limp mode when the elec throttle shuts down.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#5
11-03-2008, 09:52 AM
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The over-voltage relay powers all the the powertrain computers.
Don't understand your problem?
__________________
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
11-03-2008, 11:04 AM
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Both. Buzzing with key off (sometimes), and butterfly opens.
Quote:
__________________
Gone to the dark side - Jeff
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#7
11-03-2008, 11:04 AM
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Thanks, I'll check the OVP relay and local grounds also.
Quote:
__________________
Gone to the dark side - Jeff
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