I know I already posted this over in the hybrid section, but I know this area is much more heavily trafficked.

Alright, here's the deal. After searching long and hard to find an answer, I've come up with nothing. I'm swapping a JDM B16A turbo out of an 89 CRX Si into my 91 STD Hatch. I've got pretty much all the wiring figured out except for this blue wire on the driver's side. The B16 was adjusted so the Si harness matched up. Anyway, there is this blue wire on the 8 pin round connector (C175 or C313 I think) that I have no clue what it does. There are also 3 yellow/black wires on the car side of STD harness (14 pin connector), one of which I know is a main relay wire for the injector resistor box, but the other two I'm not sure of. There is also a 6 pin connector on the passenger side of the car (connecting to the motor) for which I know only what 4 of the wires do. The other two are the red and red/yellow wires.

If any of you have any clue as to what the wires mentioned above do, help is very much appreciated.

Unfortunately the Euro Helms and VTEC Euro addition don't cover the Si or the DPFI diagrams that I need to figure this out. My Haynes manual is the same thing (I know where I should have put that sh*ty thing along time ago )


Thanks again

 

Maybe some wiring diagrams or some info on what wires go where on connectors C175 and C313 on the DPFI and MPFI cars.

Thanks again

 

I'm guessing that's a no then???

 

Not sure if this will help you or if the info is correct but:
Using a Si harness on a Dx model
Re: MPFI Swap (Score: 1)
by cui on Monday, October 21 @ 00:58:31 CDT
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I spent the whole day trying to figure out how to make the Si harness to work...and I almost gave up...but I was too stubborn to say no


Here's what need to get the Si harness to work...in fact, I think it is much better than modifying the DX...(that is, once you figured out which wire goes to which...)

1) Parts you need:

1a) you need to add 4 wires totoal thru the firewall. (try to get them the same color, it will make your life much easier.)

* 1 wire for Cylinder Position Sensor 1, ECU pin# C1, Blue/Green, 4 ft
* 1 wire for Cylinder Position Sensor 2, ECU pin# C2, Blue/White, 4ft
* 1 wire for Injector #2, Red, ECU pin# A3, 6 ft
* 1 wire for Injector #4, Yellow, ECU pin# A7, 6ft

1b) * you will also need a DX 14 pin female connector for the right hand connector, C175...as the DX has 14 pin, but the Si harness only has 8 pin.

1c) * you also need to source a 6 pin square male connector, C212. This connector is missing from the DX.

1d) * couple pins for ECU...source for junk yard.

2. Wire connection
2a) on the round connector right next to the main fuse panel, C210, find the TW sensor wire, the Red/White wire, and cut.
Solder the connector end wire to the extended Blue/Green wire...you just connected the Cylinder position 1 wire.

2b) the remaining loose end of Red/White wire,
connect to the Red/White wire of C212, the 6 pin connector right next to the C210. This the Si TW sensor wire.

2c) find the Red/Yellow wire on C210, the the TA sensor, cut. (same as in procedure 2a)
Connect the connector end wire to the extended Blue/White wire, this is for the Cylinder sensor C2.

2d) connected the loose end of Red/Yellow to the 6 pin C212 Red/Yellow wire. This is the Si TA sensor.


Now...here's the hard part...
2e) on the left hand side, remove the all the wires on the 8-pin connector of C175...plug them in the the 14 pin DX female connector describe in 1b...

here's the order:
Si C175:
pin1, Red, #2 Injector
pin2, Brown, #1 Injector
pin3, Lt Blue, #3 Injector
pin4, Yellow, #4 Injector
pin5, Black/Yellow
pin6, Blue
pin7, Blue/Yellow
pin8, Yellow/black...resistor box

Plug Si pin#2, Brown, to the DX pin #5, Yellow, this is for Injector #1.

Plug Si Pin#3, Lt Blue, to DX pin# 3, Red. Injector #3.

Plug Si Pin# 5, 6, 7 to respective DX colored pin.

Plug Si Pin# 8, Yellow/Black to DX pin #1, Yellow/Black...this is for the Main Relay.

Connect Si pin#1, Red, to the extended wire Red, for #2 injector

Connect Si pin#4, Yellow, to th extended wire yellow, for #4 injector.

Now, there is 4 more wires need to be routed from C175 to C212. They are color-matched.

they are Yellow/Green, Green/Balck, White, Yellow.


3) swap pins at ECU (move two wires, and add two wires)

3a) move C1, Orange, to B10, for the new Si Crank Angle pin location
3b) move C2, White, to B12
3c) add the extended Blue/White wire to C1, for Cylinder Sensor 1.
3d) add the exnteded Blue/Greeen wire to C2, for Cylinder Sensor 2.

That's it! It only took me 8 hours to figure out which wire goes to which I hope this is easier for people choose to use the Si harness in the future...

 

Thanks for the help. I've been following that guide, but unfortunately there is no blue wire on my car side harness. I believe it connects somewhere to the distributor and is supposed to be routed to my B15 on my ECU, but I'm still having problems when I do that.

I actually got the car turned on and running. Doesn't seem like there are any more vacuum leaks, but it starts missing pretty bad at 2000RPM and above. I'm also throwing a code 9 on the ECU...much better than the four codes the ECU was coming up with before. Also, the car will not shut off when the key is removed.

Any ideas are very, very welcome.