Hey everyone,

I got a 91 3VZE Toyota pickup. Apparently, before I purchased it, the previous owner swapped in a replacement engine 3VZE off a 92 PU. Though similar the engines are slightly different if you do an in depth comparison. So here's my situation:

I have two sensor connectors that I cannot seem to find what they connect to. Im assuming they're related to Oil Pressure as the gauge in my Dash is not working.

I looked everywhere for any sensor(s) to connect these up to and I can't find any.

Where do these connect to???



The oil Pressure Sending unit, but I think its the old one from the original engine before the swap.

Any ideas?

 

The water temp sensor (for the gauge, not the ECT) is Y-G (yellow-green). The sensor is behind the cylinder head. The connector looks about right. (The oil pressure sensor wire is Y-B, and has a different connector.)

The wire colors on the other connector? If they are G-W and G-R, that might be to the stop light switch (for the cruise control). But without wire colors I can't do much more.

 

I’ll have a look at the back of the engine when i get a chance. I don’t think the wire loom can reach back behind it though.

The temp gauge on my truck is working, so unless the small Y/G connector is for a dash light, I’m out of ideas.

 

The female plug with the male cap, highlighted in your second image, looks just like the EGR “heater” setup on my 1991 non-California truck. The only difference I see is my truck has a G-W and brown wire to it. My understanding is they just capped the plug for 49 state vehicles, but I could be wrong. Anyway, its dark and rainy here in the PNW, I’ll look more tomorrow.

 

I appreciate the help. But that still doesn’t explain where the connection for the oil pressure sender is…
perhaps it was removed for some reason?
I’ll check to harness tomorrow for any cut connections in the loom to make sure. If there is a cut, that means I’ll simply be able to buy the correct connector and solder the wire and reconnect the Oil Pressure sender back up.
Also found this pic. Is this what that's connection looks like on yours?

 

Okay so after some investigation...Ive got nothing. Theres no extra connectors or missing sensors. My guess is that when the original owner swapped the engine he also swapped the wiring Harness which was one equipped with cruise control. The Oil Pressure sender wire is non existent and I can't find it anywhere. Original owner may have removed it completely which means I may have to disassemble the Harness to find the cut connection

Thats about all I can think of. I appreciate the help and input everyone!