hardtime21

I have a tech question, Is there a difference between the two KA ECUs as I have an OBD 1 95 S14 that I just completed a auto to manual swap in and when I attempt to start it just turns over? I'm using an OBD 2 Manual ECU from a 96 S14. The starter plugs are different at the engine bay fuse box. The OBD 1 Lower Harness has a 2 Pin Plug and the OBD 2 Lower Harness has a 3 Pin Plug. So that it's converted right, what do I need to check and change?

4x4le

Im not following. There is no obd2 95 s14's

hardtime21

Forgot to state that I had an ECU from an OBD 2 96 S14 KA24DE. What are the differences from the 95 OBD 1 and 96 OBD 2 ECUs? Also the Starter wire from the OBD 2 Lower Harness has a 3 Pin Plug where as the OBD 1 Lower Harness has a 2 Pin Plug. Does anyone have the Wiring Diagram or Wire Color Directory for what color wire goes to what between the pins on the lower harnesses?

hardtime21

Any Techs wanna tackle my questions?

ganju

i second the wire colour directory i been looking for one for a month now cant find it.. thanx. (im not trying to jack your thread bra)

lucas13dourado

I'm on the same page as you, unfortunately I bought a Power FC for a 95 not knowing I had 96 harness/ecu FML.
If I find anything out I will let you know

hardtime21

Thanks, I'm trying to convince Chase Bay to the market year specific upper and lower harnesses. Anyone that knows 240s, know that the 95 model year has a specific set of upper and lower harnesses unique to only that year. 95/96 my ass! Lol, check the sensors of the upper and the starter plug of the lower. OBD 1 vs. OBD 2! OBD 1 has the capabilities of OBD 2 but simplified with less crap like additional sensors. (IE emissions) Some of us can't avoid that BS and have to resort to having our shit tested. Any techs wanna tackle my questions and statements?

Robb

Not true. 1995 was offered in OBDI until it got closer to 1996, where OBDII became the standard. So there ARE OBDII 1995 S14's. Best way to check what your car came with is to just look for the OBDII access port.. or check to see if you have a single wire O2 sensor. I think OBDII has a Crack Position Sensor..

You're not going to be reading from a LOT of sensors wired for OBDII compliance. Is your CEL on?

Are you using the Auto or Manual ECU right now?

slipandflow

Hrmm. This is kinda off topic and thread jacking lol but if I have an OBD1 car but I put a tranny from a OBD2 into my car i should be running with a OBD1 manual ecu right? Or do I have to do a OBD2 swap? Tranny shouldnt matter right?

4x4le

All of the 95 ecus are capable of sending some sensor information to the obd2 port wether the car came with it or not. That act alone does not mean the car or ecu are actually obd2 complient. All of the 95 ecus are practicially all the same.

Over the years we have seen hundreds of 95 ecus, we would have seen an obd2 one by now if there was one because our nistune board would not fit or work.

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24096

im guessing you would have to cut into it to get it to work.. if not.. i will buy your 96' manual ECU i am in need of it.

SiDwAyZ240

I know this is old but I still have some questions. I have been reading on this cause I want to use either a rom tuned ecu with a conversion harness or add a daughter board to my ecu and get a chip burner. I'm just looking at the most cost effective way. I have a 95, some say there are 95 OBD I but I have read some threads on various forums that say [B]ALL[B] S14s are OBD II. These threads state that its not a matter of OBD II or I but what they called "odd ball" ecu's. They say a blue connector on the ecu is the same as a S13 OBDI KADE which will accept a daughter board even though its still OBD II. A white connector is the same as 96-98 ecu that will not allow install of a daughter board. I'm trying to figure out the differences in the pin diagram on these two to see if a conversion harness is needed. Anybody have any ideas.

4x4le

ALL, ALL 95 s14 ka ecus are obd1 period.

Anyone that says otherwise dont argue, just prove it.

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picsbypenny

Still lost, I have a 96 ecu for my 95 s14. Car doesn't turnover, is it because i have to change some wiring around?

__________________
95 RB25NEO Silvia Skid Race Thing
95 2J Dreaming 240sx Street Car

hardtime21

Yes, the 96 ecu pinout differs slightly than the 95. JWT (if I'm not mistaken) has a write up on this.

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hardtime21

Just noticed how old this was! Smh

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rookie

ALL, ALL 95 s14 ka ecus are obd1 period.

Anyone that says otherwise dont argue, just prove it.

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I don't know what to say... I have a 95 s14, the catalytic converter is right below the headers.. I had check engine lights on and went to get it diagnose, sure enough they hooked up the obd2 and it check out egr.. I can't explain this, Can anyone explain this?

4x4le

You have an obdii port, without the full obd2 capability. It is obd1 you could not have emissions tested with obd2, you would still have to do a sniffer because your ecu does not support the readyness tests

rookie

So since the diagnose is read from the obd2 port "egr solenoid" is that a correct reading?