Benching Ecms

[goflo at pacbell.net]

Not clear from description how you are rigging the map input to the ecm.
For 0-5V approx you need a voltage divider across the voltage source.

                     
*          R1           pot           
5V ------/\/\/\-----/\/\/\/\/\------ground
                         |
                         |__________ to ecm map input  
                      
R1 is for current limiting. If your 5v source can source 5 ma then
use 1k for R1 and your 5K pot. If not increase R1 to 10K and use a 
50K pot.

Regards, Jack
 
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??..
>     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?.
>     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.
> TIA
> Bruce          Ya shoulda seen the staff run when I yelled "Fire in the
>                     Hole", when I flipped the main switch on.