Zener diode map fooler - Diesel Forum

strokin_early_99 · 01-27-2008, 03:20 AM

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.

DIRTBIKEZ · 01-27-2008, 08:41 AM

That mod tricks the truck into thinking it has full boost and allows the pcm to full fuel.

444-4D · 01-27-2008, 01:45 PM

Quote:

Originally Posted by strokin_early_99

A friend and I are trying to prove or dis-prove this mod.

What are you trying to prove or dis-prove? What are your expected results?

strokin_early_99 · 01-27-2008, 01:49 PM

Whether it works or not and how it is affecting the PCM in doing so.

Which way is the correct way to install the zener diode?

Do you have any input?

444-4D · 01-27-2008, 01:54 PM

Quote:

Originally Posted by strokin_early_99

Do you have any input?

I might if I knew what your definition of work is. What will the result be if it works?

strokin_early_99 · 01-27-2008, 02:01 PM

444,

Why are you being so cryptic? How hard was my OP to understand?

Does this mod work? In other words does it actually keep the SES light from coming on without effecting performance like some have reported?

I am at a loss for words as of now..........I need coffee................

444-4D · 01-27-2008, 02:13 PM

Quote:

Originally Posted by strokin_early_99

In other words does it actually keep the SES light from coming on without effecting performance?

Yes it will do that. Wasn't sure what you expected. Some of the comments I've seen sound like a performance increase is expected. It won't do that.

Connect the end with the band, or stripe if you prefer to call it that, to the center wire of the MAPand ground the other end. One of the map wires is a ground. You can either ground to it or attach your own wire to the other end and connect it to another ground. I think the easiest way is to make a zener pigtail and connect it the way Banks does. You can look at their instructions on their website.