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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