Benching Ecms
Bruce Plecan
nacelp at bright.net
Thu Jul 30 00:43:20 GMT 1998
-----Original Message-----
From: Walter Petermann <corsaro at brokersys.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, July 29, 1998 8:22 PM
Subject: Re: Benching Ecms
>Bruce Plecan wrote:
>>
>> Finally applied power to the bench ecm project today, and all seems
>> good and well so far. Upon reflection I want to run something past the
>> folks that have already done this, is using a 5K pot OK for the MAP,
>> and TPS??..
>
> It should work fine.
>
>> The reason I ask is that with the MAP twisted to high and with a
>> 1K ohm resistor in line, I still get a MAP voltage of 5.1volts. Should I
>> increase the value of the "limiting" resistor?.
>
> Bruce, I don't know what you mean by 'twisted'. Are you putting the
> resistor in series with the MAP output?
Yep that's what I did.
This will not effect the
> voltage at the ecm pin since there is very little current flowing
> into this pin. The resistor would probably have to be in the range
> of several hundred K before you'd see a voltage drop. Unless you
> have a variable vacuum source for the MAP, the 5K pot sounds like
> the way to go.
>
>> I also used a 470 ohm resistor thinking that would keep the min
>> TPS to about .5volts, but it's .18volts.
>> What's the error in my thinking here.
>
> Sounds like either your 5K pot is actually 15K, or the 470 ohm resistor
> is on the supply side of the pot instead of the ground side.
>
>> TIA
>> Bruce Ya shoulda seen the staff run when I yelled "Fire in the
>> Hole", when I flipped the main switch on.
>
Not only helps, but makes sense also. Learned something,
sometin new to boot.
Cheers
Bruce
> hope this helped some,
> Walter
>
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