Join Date: Jul 2006
Location: Newark, CA
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Zener diode map fooler
I am digging up the past here but bare with me.
How does this work?
How is it installed?
I have found where some say to splice in the banded end with the LG/BK and the other end of the diode to the Gy/R. Wouldn't this show 4.7v all the time to the PCM?
I have also found where some say that you Splice the diode into the center wire of the MAP sensor plug (green w/ brown trace) with the banded end of the diode to the wire. Attach the other end of the diode to your wire and run it to ground
So, is it even one of these?
Why does AE only monitor the MAP in Hz?
I tried it with AE set as a 98, 99, 2K, 01, 02 and 03. They all read Hz and I need volts to do my testing.
I understand that 5V goes to the MAP and 1V should be sent back to the PCM as a reference voltage. But that is just knowing that the PCM voltage is 5V.
A friend and I are trying to prove or dis-prove this mod. I have searched every site out there and find very little other than arguments but no data and/or proof of anything. I am racking my brain on this one here.
Thanks in advance,
Yes, this is multi-site posted.
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