Allright,where the hell does this go?

[supraman7mgte]

While changing a water temp sensor today,(and checking turbine play) I came across this plug that did not go anywhere, It had been disconnected for awhile,judging by the grime, It comes off the harness hat has the water temp sensor plug and the a/f meter plug. This is a 1991 California Supra turbo,and I was thinking that it might go to some sort of emission sensor. By the way,my mpg is about 14,DAM!!
:icon_conf

 

[supraman7mgte]

 

[supraman7mgte]

 

[Kroze]

your picture-taking skills suck. Put the camera on "macro" mode to take close-up pictures so that it won't come out all blury.

 

[siman]

I guess look for a male plug connection on the right side of your engine bay....

there is some heat shrouding on it so it has to be located somewhere hot....hence by the turbo/exhaust.

 

[IJ.]

Is that an O2 sensor plug?

 

[MisterTurbineTwister]

It could go to your ABS unit or maybe your oil pressure sensor, but my connector looks different for my oil press. and my car has no ABS... So it's hard for me to compare.

Could it go to a TEMS strut? see if there is another one on the drivers side. If there is and your car has no TEMS, it could have been hanging from the factory.

The only other thing it could be is a temp sensor connector. (there are 5 of them on the thermostat housing) Check close to your power steering resivoir.

I would go through the toyota supra repair manual online or the the electrical parts catalog and write down all the possible 2 pin sensors that it could be and their locations. Process of elimination.

I know that there are these components on the passengers side of the engine that have wires running to them:

Air Flow Meter (not the connector you show and your car would run like ass if at all if it was disconnected)

Oil Pressure Sensor (single wire)

Oxygen Sensor (should be obvious)

ABS unit (if you don't have it, it doesn't matter)

TEMS strut (should be obvious, unless you don't have it)

One of the 5 Temp sensors on the thermostat housing (check them all and check for capped off sensor outlets)

Cam Position sensor (your car will not run without this)

I would check the sensors on the thermostat housing, the TEMS unit, Oil pressure sensor and the ABS unit if you have it.

Also, if it is your O2 sensor, this would be why your car is getting 14mpg. I would check your spark plugs and read them. Also see if your ECU is throwing any codes.

 

[suprra_girl]

from the factory, nothing like that plug lives on that side of the motor... only thing i can assume is that it has been rewired..
my guess...
that harness is from a pps 7mgte, plug on rack broke.. so previous owner rewired rack plug, then put that plug on the harness side

check for solder joins inside the wire heat coating, just feel all down it and see if you can feel any lumps from joins made

 

[gixxer750]

I have that same plug on my engine in the same place, and it has nothing to plug into at all......

 

[americanjebus]

have you tryed taking a multimeter to it or following the wires

 

[Yawgmoth]

I have that same plug on my engine in the same place, and it has nothing to plug into at all......

same here, in fact it was on the new wirng harness I got off a 90, and my car is an 89. isn't 90 the year they introduced speed sensitive powe rsteering? I always assumed it was for that

 

[lagged]

its NOT an oil pressure sender plug. the OP sender uses a single wire spade connector.

 

[supraman7mgte]

yeah,i traced it to the harness that goea to the afm,and the water temp sensor. but if it goes to nothing,i'll just cap it off.

 

[YoNkErS87t]

89' came with the speed sensitive power steering.

 

[Allan_MA70]

that is for the front wheel speed sensor for the ABS

 

[john]

that plug goes to the a/c dual pressure switch that runs along the pass rail.

 

[mrnickleye]

A/C...perhaps ....There are 2 sensors/switches in the high pressure line along the frame area, on the way to the evaporator. Each has 2 wires connectors.

1 is for turning off the a/c when the pressure gets too high. When I converted to R134a, the high side pressure runs about 40 pounds higher on a very hot day than the R12 did. I unplugged it and made a jumper to keep the a/c working.

The other sensor/switch tells the little a/c electric fan's relay to ground when pressure comes up, so current will go to the fans.

 

[isnms]

It's is connector O2 for an NA o2 sensor
http://www.cygnusx1.net/supra/library/Wiring/pages/Page_023.html

connector O3 if for a Turbo o2 sensor

 

[mrnickleye]

Oh ! Oh !.....I know ! I know !........It's a 'muffler bearing" connector. DON"T mess with it, or break it !!........They're like $1600 bucks from the dealer....It's a special order part, and will probably take about 18 weeks to get (plus you have to pay in advance). I'd take it to a specialist, so it's hooked up 'properly'. (plus if they ruin it, they'll have to cover it). Good luck !!! Also, DON"T drive the car without it in proper working order....

 

[drunk_medic]

I have a '91 Turbo with all options except for auto tranny [and mine is a targa, not sunroof]. I remember that I have an empty plug in/around that area as well. I located mine when I removed the air filter, AFM and accordian hose all together to gain access to install my boost controller lines to the wastegate actuator and compressor outlet. The line that I found disconnected and sitting around was on the "flat" part under the accordian hose, on the side of the slope coming down from the strut tower.