code 34 and confusion with connectors... pic included

[bones72751]

Hey guys, I need a little help with my 1990 z32 NA I just bought. Its giving me the code 34 dtc, so I'm trying to bypass the det sensor to see where the issue lies. After research online I found a page (robo z32 page) that said the vtc connectors and det sensor connector get swapped often by ignorant mechanics. He also stated the det sensor should be connected to a white & grey harness (ecu side) and the vtc should be a black/red & green/black. I found what appeared to be a mistake on mine as the det sensor was attached to a black/red & green/black and the vtc was connected to a white/black on the passenger side. I swapped the vtc and det sensor bypass plug around but it's still a little strange... below is a pic:

-The red circle is where I have the det sensor bypass (resistor) connected to a white & black harness, though it's coming from the passenger side of the engine. It looks like when the PO did a motor swap he messed up where the harness is run because there'd a lot of wiring just dangling.

-The yellow circle is where I plugged in the passenger side vtc into a fairly heavy gauge green/black & red/black wires at the harness.

-The blue circle is where I have the driver side vtc plugged in to a smaller gauge green/black & red/black wires at the harness.

I'm confused at why the green & red harness wires with matching connectors are 2 different gauge wires. Also confused because I am still getting the code 34, which means I'm either bypassing the wrong plug, my resistor didn't work (ohms test good at the pins inside the plug), or the circuit is broken closer to the ecu...

Please help figure out what I'm doing wrong!

[ThisIsSparTTa]

You could just make your life easy and use this diagram to test continuity between each sensor and the ECU so you're sure you have the right ones. http://z32.wikispaces.com/file/view/ECCS_colored_m.gif . Sounds like your PO cut in some new wires and connectors. It's not uncommon for the replacement connectors to use a different gauge wire. It's no biggie really. Voltage is voltage. The only time you need the larger gauge wire is to carry more current, which these sensors/solenoids should not be pulling much of, so it shouldn't be an issue.

[bones72751]

Thanks a bunch, got that figured out. Now I also have a bad iacv. When buying another one, do I need a new ficd with it or can it be removed from my current unit. Also, why would by idle ramp from 800 (currently set there since aac is out) to almost 1500 when I turn the heater on? AC isn't working, so I can't say if it's the same with that too... seems to be whenever the blower is on.

[ThisIsSparTTa]

Not sure, but yea, you should be able to use the FICD if it still was doing its thing properly.