ok, quick question, at the end (front?) of the emission harness. there are 4 connectors.

2 of them are for fuel injectors
(one is warp in white tape. I assume that's for Primary injector and it's already connected, as seen in the picture behind my oversized hand)

what about "these" 2 ?



reason I ask is, I'm going to put the UIM back in soon and trying to figure out if it's something for the Front or the back(like the tranny)

I know I can go look but I'm in a hurry need to get back to work to handle something and wanna resume the rebuilding later today (in an hour or 2)

Thx

 

Educated guesses: Left = one of the ACV connectors, Right= BAC valve connector.
Guessing this is an S5?

 

If the one on the right has a Blue/Green and a B/W wire then it is for the BAC. If it has a Green/White and a Brown/Black wire then it is for the Water Thermosensor.

What color wire feeds to the left connector? If it's White then it is the Knock sensor.

 

i would say the green one goes to the thermosensor on the back of the waterpump. the black one...not too sure? O2 sensor maybe?

 

I just got home.

the one to the left (Circle connector thing) has only 1 wire, and I think it's green ? the color kinda fade out.

the left one has 2 lines, something like brown with blue stripes and the other is brown with red stripes ?

 

yes this is S5.

it's the very end of the Emission harness. 4 connectors, 2 goes to injectors, and these 2 ...

I wanna position it correctly (face it to the front or to the rear) before I put the UIM back on. cuz it's a PITA to remove it after the engine is back into the car.

 

another angle of what the connector "looks like"

 

Pin 2M is for the Knock sensor. If you ohmed out each of the ends of Pin 2M and the wire in the round connector and it ringed out then you know it's for the Knock sensor. 2C is for the Oxygen sensor. 2E is for the Water Thermosensor and 3Q is for the BAC.

 

I found the Square one is for the Water thermo sensor. removed the old one from the old water pump, installed to new, *click* in place.

now the last one ... the 1 pin round connector ... hmm ... trying to locate ...

 

its for the fan switch. not all cars have the switch (or the fan), but they all have the connector. if you had it, it would be right under the water thermosensor

 

sounds right.

 

fan switch? no wonder! I was like "this connects to where? I don't recall anything that looked like this"

so I guess I can leave this round thing out.

Many thx guys

 

I can verify that this is correct! I have both on my pump housing, jdm s5 tII.

 

How funny! I had this exact same problem when I rebuilt my 89 N/A RX7. I asked the same question but nobody here knew. I wish I had loaded the pictures that you did, because when I saw them, I just laughed out loud!!!!! Green connection goes to water thermal sensor that you found. As you look right under that connection, you'll see another connection. That's where the round connection goes. Basically I learned that, you have to install/connect this wiring before you attach the dynamic chamber on the top of the engine. Attach the fuel injector connections...

 

Oh yea, and it's not a fan connection. I don't know what it's called but I think it's got something to do with cooling since it's connected to coolant system... NyCaps I'll bet you have a 89 N/A... I just finished my rebuild. I had a starting problem, turned out to be a bad fuel pump.... So if you need any advise or tips, just ask...

 

It's a thermo switch connector.