s13 sr20det AC wiring woes with pics

[hulkster_s13]

need some help here please. i bought a s13 sr20det harness converted to a s13 chassis, problem is that the harness had the 2 AC wires removed all the way back to the ECU from the chassis plug. i need to help on which ECU pin to rewire the GRN/ylw back to. on the SR ECU to me it looks to be either pin 10 or 106. i just dont wan to guess and fry something.am i correct that the harness plug AC wire goes straight back to ECU?
sorry for the blurry pics
heres the plug
http://i3.photobucket.com/albums/y55/eastwind_240/IMG_4108.jpg
ecu pin 106 with some wire still there
http://i3.photobucket.com/albums/y55/eastwind_240/IMG_4109.jpg
ecu pin 10 with wire missing (the one with the black line)
http://i3.photobucket.com/albums/y55/eastwind_240/IMG_4111.jpg

[g6civcx]

read this: http://zilvia.net/f/engine-tech/293028-ultimate-s13-sr-wiring-guide.html

[hulkster_s13]

Thing is that I read that and I still don't have an answer. I'm trying to get AC running. The sr harness originally comes with 2 grn/ylw wires going to the engine bay plugs. Both of those were ripped out. I know one is not needed I need to find out which pin the wire I needed goes to. In that guide it says pin 10 and 106 is not needed.

[g6civcx]

You need to find out what each wire does. Pull up the KA FSM and look at the schematic for the AC. Figure out all the wires that need to be hooked up.

Then pull up the Japanese 180SX FSM. Go to the last page with the schematic. The words are in Japanese but the symbols are the same as the KA FSM.

Plus I already translated the pins descriptions for you.

You match up the components. The S13 SR and KA ECU processes the AC component exactly the same way. The pins and wire colours are slightly different. Otherwise just find the correct pin on the SR ECU and connect from the body.

[g6civcx]

In that guide it says pin 10 and 106 is not needed.

Read the guide very carefully. These pins are not needed to run the engine. You don't need to hook up the AC to run the engine.

[DALAZ_68]

You don't need to hook up the AC to run the engine.

I'm trying to get AC running.


honestly, hit up either gxrjjordan, Bardabe, maybe steve shadows...one of em can most likely help you out best here when it comes to wiring...

readin FSM's isnt for everybody....trust me...i know...

[hulkster_s13]

i know how to wire up an SR. its not an issue of getting the car running, im trying to get the ac to work thats it. trying to fix a harness that was tampered with. i want to run AC. i have a KA fsm, and i have a s14 sr20det fsm that i am cross referencing with. KA doch shows its going to ecu pin 11 which is labeled "AC relay", s14 sr20det shows its going to ecu pin 9 which is labeled "AC relay". my #62 ecu has pin 10 and 106 labeled "AC relay".why does it have 2? both ECUs pinout diagrams that i have 1 AC relay on them. the JDM fsm that I found doesn't have anything on the AC part of it.it was only a partial fsm that only had the wiring schematic of the engine components. i have searched and Im a big fan of the google machine. if im asking its because im lost. if anyone has the answer just shoot me in the right direction (complete jdm sr20det fsm) or at least the complete ECCS wiring diagram so i can add it to my "bible" folder.

[g6civcx]

honestly, hit up either gxrjjordan, Bardabe, maybe steve shadows...one of em can most likely help you out best here when it comes to wiring...

Re-read his comments carefully. My thread was intended to get the engine running minimally, but I did spend a lot of time translating EVERY SINGLE WIRE and EVERY SINGLE ECU PIN for the masses. You can use my thread to hook up all the accessories.


readin FSM's isnt for everybody....trust me...i know...

If he makes an honest effort then I will help him. There's no point in wasting all the other guys' time spoonfeeding remedial stuff.

[g6civcx]

i know how to wire up an SR. its not an issue of getting the car running, im trying to get the ac to work thats it. trying to fix a harness that was tampered with. i want to run AC. i have a KA fsm

Good. The KA FSM has to be for the same year as the shell. It can't be just any KA FSM.

and i have a s14 sr20det fsm that i am cross referencing with

need some help here please. i bought a s13 sr20det harness converted to a s13 chassis

This is a problem. Do not use the S14 SR FSM. I already told you:

Then pull up the Japanese 180SX FSM. Go to the last page with the schematic. The words are in Japanese but the symbols are the same as the KA FSM.

You need to listen to what I'm telling you to do and not go off on your own.

The S14 AC system is different from S13.

KA doch shows its going to ecu pin 11 which is labeled "AC relay", s14 sr20det shows its going to ecu pin 9 which is labeled "AC relay". my #62 ecu has pin 10 and 106 labeled "AC relay".why does it have 2? both ECUs pinout diagrams that i have 1 AC relay on them. the JDM fsm that I found doesn't have anything on the AC part of it.it was only a partial fsm that only had the wiring schematic of the engine components. i have searched and Im a big fan of the google machine. if im asking its because im lost. if anyone has the answer just shoot me in the right direction (complete jdm sr20det fsm) or at least the complete ECCS wiring diagram so i can add it to my "bible" folder.

Go to Google and try to find "Japanese 180SX FSM". Something like that should get you the link to the complete Japanese FSM.

Go to the last page. It has the schematic for every single ECU pin. You can follow the circuitry there and match up with the KA circuitry.


UPDATE: I may have spotted an issue in the pinout thread. Let me sort it out for you.

[g6civcx]

I updated the thread. There is no pin 10 on the S13 SR ECU. Pin 106 is the ground wire for the AC relay. Hook that pin to the ground wire on the AC relay on the body.

[hulkster_s13]

Good. The KA FSM has to be for the same year as the shell. It can't be just any KA FSM.
my FSM is for my year




This is a problem. Do not use the S14 SR FSM. I already told you:



You need to listen to what I'm telling you to do and not go off on your own.

The S14 AC system is different from S13.
was just using it as a reference to see if they were the same


Go to Google and try to find "Japanese 180SX FSM". Something like that should get you the link to the complete Japanese FSM.

Go to the last page. It has the schematic for every single ECU pin. You can follow the circuitry there and match up with the KA circuitry.
like i said my 180sx fsm in japanese was incomplete, still searching for one. the ones that i find is exact one that i have. the one i have is only about 15 pages long


UPDATE: I may have spotted an issue in the pinout thread. Let me sort it out for you.
i have included my ecu pinout note which shows pin 10 and 106 as being an AC relay.
also i included my sr20det in japanese that shows that its pin 10
you said its pin 106
see my confusion?
am i using the wrong ecu pinout because everything matches up.
i just noticed on the japanese fsm that pin 106 has something to do with vvl. but everything else is 180sx, coversheet and all.somebody did a bad job compiling all that info? all these fsm wiring sheets is blowing my mind.
just to clarify green/yellow stripe on the grey plug at the end of the engine harness goes straight back to ECU pin 106.
thanks for your help and i will let you know how everything goes. if you see something i missed LMK.
Zilvians is awesome!

[g6civcx]

Don't use other people's translation. Ideally you would use the JDM 180SX FSM directly.

Give me your email address.

[g6civcx]

I just emailed the JDM FSM to you.

Other than the ac relay, there is the thermistor, air intake temp, pressure switch, and the compressor itself.

All these components interact with the S13 SR ECU exactly as it would with the S13 KA ECU.

Don't use any S14 info because the S14 has extra stuff not present on the S13.

If you have any specific questions you can ask me.

[hulkster_s13]

got it thanks again!

[DaveAZ]

(S13 SR20 Red in 1989 240SX) Is pin 106 a direct ground for the AC relay? We have it wired like that, and it doesn't provide a ground for the relay.

Went so far as to ensure F3 (AC push button control) was jumped to pin 41 on the ECU. (early 240 does NOT have the highly talked about yellow/black wire, but has the blue/green) Still no relay. Relay is verified good.

Anyone know what the ECU has to do to provide the ground?