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#1
03-12-2010, 01:52 PM
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ASR phantom
We have been chasing a phantom ASR problem for almost a year. The car is a federal 1993 300CE. It goes into "limp home" only at low speed, only once when cold, and usually doesn't repeat for 4-6 days. There is no ASR lamp lit but the ASR circuit is alive and well because I can brake the rear end loose and get the light.
We have replaced all of the usual suspects. I sent the ETA out to BBA Remanufacturing for rebuild. I am fairly OK with their work but they will recheck it if necessary. Before I pull it again I need some wiring diagram help. We replaced an obscure micro switch on the pedal linkage under the dash. When you back off on the gas pedal the switch opens. When you accelerate the switch makes. Can anyone tell me what circuit this completes? My indie does not have the current wiring diagram for this car. The reason I ask, is that my limp home problem only occurs with the switch open upon deceleration. Thanks, Anziani '93 300CE 182K '95 E420 118K 
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#2
03-12-2010, 02:43 PM
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Are all tires exactly the same with no low inflation?
__________________
 Gone to the dark side - Jeff
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#3
03-12-2010, 06:50 PM
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Yes, brand new tires all inflated to 33psi. New neutral safety switch, brake switch, new voltage regulator, alternator and battery. I've tried every thing that has been suggested on this forum. That is the reason for the request for the wiring diagram for the pedal switch.
Thanks for your interest. Anziani
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#4
03-13-2010, 08:47 PM
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ETA is a good thing to replace anyway, if it's original. Probably mositure and cold-related. Mine and some others have done similar things. Would be interesting to see if it goes away as the temps rise
__________________
former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL
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#6
03-19-2010, 12:56 PM
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When you are not touching the accelerator pedal the switch is OPEN (infinity).
And when you press the pedal the switch is closed (900 ohm).
__________________
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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