Anyone got any clues as to where these plugs go or what they're used for?

 

What are they from?

how long are the wires?

the gray one looks like an O2 plug.

 

It comes from the harness that goes past the oil cap and the wires are kinda long

 

Here is where it comes from

 

Camshaft and crankshaft sensor plugs?

 

Auto or 5 speed?

Those are for the O2 (gray one, and should be 2 of them), speedometer, transmission, and transfer case. At a minimum there should be two O2 sensor connectors; three connections to the transfer case (not including the speed sensor): 2wd/4wd switch, Hi/Low switch, and transfer case neutral; a speed sensor connection; and a 2 wire reverse switch (5 spd) or a much larger connector that tells the ECU which gear the auto trans is in.

Look in the various EWDs for your donor's application and it will show pictures of all the connectors at the end of each section, match the connectors visually to identify them, then look at the diagrams for those connector names to find their functions.

 

this .....



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Thanks for the help! but where in the world would those be located? ive been looking all around the trans and only found one thing to plug into.

 

They plug into the 3.4L transmission and transfer case. Your 3.0 transmission and transfer case will likely not have connectors for everything and you will need to cut the relevant connectors off your 3.0 harness and splice them onto the 3.4 harness.

For example, in my case I had a 96/97 Auto 4x4 4Runner wiring harness, that I converted to work with a 97 5 speed 4x4 4Runner harness and my 3.0 transmission and transfer case.

I know I needed to keep the 4wd signal (the 2wd vs 4wd switch) but I didn't need to keep the hi vs low switch (the 3.0 transfer case doesn't have that switch or connector) or the transfer case neutral switch (again, the 3.0 transfer case doesn't provide for a neutral switch, and then there's the fact that it doesn't have a "neutral" or at least I haven't found it), so 2 of those 3 connectors got cut off.

My 91 has a mechanical speedometer, so I had to pull the SPD signal from the dash harness rather than the speed sensor on the transfer case, that was another connector I could cut off.

My 3.4 harness was originally set up for an A/T with wires for each and every gear option so that the ECU knew what gear it was in, with the M/T all I needed was the 2 wires for the reverse switch to activate the reverse lights on the tail gate. The park neutral switch was also cut off and un-used (A/T only).

I then cut the 2wd/4wd connector off the 3.0 harness and replaced the 3.4's connector with the one that would actually fit my transfer case. Similarly, I moved the 3.0's reverse switch connector to the 3.4's harness.

I actually took things a step further and dissected the 3.4 engine harness and removed all the now un-used wires, but be careful doing this all the wires in that harness are incredibly tangled and make sure you only removed the desired wires (I actually pulled 1 too many and got to re-route that wire all the way back).

 

So basically I only need to find the 4wd signal and the reverse light wires?