OBDI or OBDII ?

[fatlizzard]

Is my "95" 240sx with a manafacture date of 3/94 an OBDI or OBDII ?

[hassanbakar123]

94
aaaaaaaaaaaaaaaaaaaaaaa

[burnsauto]

check the obd port under the dash on the drivers side. that will tell you for sure. Odds are its OBDI

[Ben G]

Is my "95" 240sx with a manafacture date of 3/94 an OBDI or OBDII ?
i know my 96 is obdII

[fatlizzard]

The obd port on mine is on the passenger side below and just to the left of the glove box !!

[Ithical]

95 i believe is obdI, II started from 96.. Not sure but it's what i've heard from others.

[LA_phantom_240]

There is some controversy over which are OBDI and which are OBDII... I think my s14, built in 3/94 is OBDII, but I'm not sure either. It reads correctly with an OBDII code scanner, which I've been told it shouldn't if its OBDI.

[projectRDM]

It's like the biggest fucking broken record lately.

1995 - OBD plug below glovebox = OBD-I
1996-98 - OBD plug located beside hood release = OBD-II

There is no other way to look at it. Build date means nothing.

[zipman72]

My '95 is OBDII.

[projectRDM]

My '95 is OBDII.

Where is the OBD plug? And is there a carbon canister under the hood?

[TurboStrong]

obiiiiiiiiiiiiiiiiii 1

[LA_phantom_240]

Where is the OBD plug? And is there a carbon canister under the hood?

Carbon canister would mean OBDI, correct?

[burnsauto]

yessir, canisters are obdI

[nzmoman]

It's like the biggest fucking broken record lately.

1995 - OBD plug below glovebox = OBD-I
1996-98 - OBD plug located beside hood release = OBD-II

There is no other way to look at it. Build date means nothing.


its as simple as ^^^ its amazing people don't understand this.

[98s14inaz]

The obd port on mine is on the passenger side below and just to the left of the glove box !!

It's obdI then. Depending on the state they'll just use the sniffer.

[g6civcx]

yessir, canisters are obdI

Are you saying that OBD-II cars do not use evaporative charcoal canisters?

[projectRDM]

Are you saying that OBD-II cars do not use evaporative charcoal canisters?

They use the EVAP canister, located in the rear of the car. It's a completely different type of system, it purges and filters based on solenoid control as well as engine vacuum, and flow is dictated by fuel temperature, ambient temperature, and other factors. The basic charcoal canisters purge all the time based on vacuum only.

If the car has a charcoal canister under the hood, beside the airbox, it's OBD-I.

[twistedsymphony]

From an emissions enforcement and testing standpoint all 1995s are OBDI and exempt from the plugin test. It doesn't matter what the car is actually equipped with, it wasn't required for 95 model years so they wont enforce it for those model years.

From an actual functional standpoint 1995s manufactured after 9/94 use an OBDII compatible computer. the Port is still on the wrong side but you could pull the computer and put it in a 96 and pass the OBDII test... pre 9/94 ECUs are ACTUAL OBDI computers and are not emissions compatible with newer cars. I've confirmed this personally. (I own an early production 95 and was unable to get a read on an OBDII reader, I know someone running a late period 95 computer in his kouki and with no emissions testing issues)

If you're not sure check your O2 sensor... OBDI cars use a single wire... OBDII cars use 3 wires, the manufacturing date should be stamped right on the chassis info plate, or you could also cross reference the ECU label to determine what car it came from.

HT = 95 240sx MT (KA24DE) (mfg before 10/94) (A18-E07-G90) OBDI Emissions
HU = 95 240sx AT (KA24DE) (mfg before 10/94) (?) OBDI Emissions
3C = 95 240sx MT (KA24DE) (mfg after 9/94) (A18-892-G00) OBDII Emissions
3D = 95 240sx AT (KA24DE) (mfg after 9/94) (?) OBDII Emissions

[LA_phantom_240]

I'm guessing you can't use an OBDII computer in an OBDI s14, correct?

[twistedsymphony]

I'm guessing you can't use an OBDII computer in an OBDI s14, correct?

I'd say there is a good chance it would work in a 9/94 MFG date or newer.
before then... it would probably WORK but throw codes.

You would probably want to at least swap the MAF (I think it might be different, though I could be wrong) and O2 sensor as well.

[projectRDM]

I'd say there is a good chance it would work in a 9/94 MFG date or newer.
before then... it would probably WORK but throw codes.

You would probably want to at least swap the MAF (I think it might be different, though I could be wrong) and O2 sensor as well.

Incorrect. The MAF is the exact same. As far as the O2, the 3wire is just a heated sensor for quicker readings, you can use an OBD-II ECU with the 1wire sensor, you'll just get a code during warmup. The only other difference is the TPS and CTS, they have different plugs but read the same.
You can also go the other way and use an OBD-I ECU in an OBD-II chassis, the 96 cars are a direct plug in, 97-98s require repinning three wires, JWT has a PDF on what's required. You'll also lose the rear O2 sensor since it's a 4wire on 97-98s unless you run an extra wire, but it's not needed anyway for engine operation.

[LA_phantom_240]

What the fuck?!? My s14 is from 3/94, yet it reads correctly with an OBDII code scanner, and has a 3C ECU.

Can someone tell me what's going on? lol.

[projectRDM]

What the fuck?!? My s14 is from 3/94, yet it reads correctly with an OBDII code scanner, and has a 3C ECU.

Can someone tell me what's going on? lol.

Anything with an OBD plug, I or II, will work. The difference is the actual codes. 1995 cars used manufacturer codes only, while 1996+ they're mandated across all manufacturers. Read through the 1995 FSM, you won't have the same amount of codes, nor do the numbers all match up to 96+ codes. You can pull some codes using a OBD-II scanner on a 1995 model, but not all, and some won't match to what the actual problem is.

[LA_phantom_240]

If my ECU is a 3C, which should be OBDII, will all the codes be OBDII compliant?

I'm calling my car OBDI½ lol. I was built 3/94, which should be OBDI, and yet it has a 3C OBDII ECU. I wouldn't imagine that the ECU had been swapped cause the car has a KA and OBDI harness... But then again...

[projectRDM]

If my ECU is a 3C, which should be OBDII, will all the codes be OBDII compliant?

I'm calling my car OBDI½ lol. I was built 3/94, which should be OBDI, and yet it has a 3C OBDII ECU. I wouldn't imagine that the ECU had been swapped cause the car has a KA and OBDI harness... But then again...

I don't trust those numbers. If you have a 3C ECU all that tells me is your ECU has a big 3C on it. It's still a 1995 model.

[LA_phantom_240]

I don't trust those numbers. If you have a 3C ECU all that tells me is your ECU has a big 3C on it. It's still a 1995 model.

Is there any way I can tell for sure?

[projectRDM]

Is there any way I can tell for sure?

Unplug the VSS and drive the car long enough to trip the CEL, then pull up the code. If it's code 114, it's a 1995, OBD-I. If it's a code P0500, it's OBD-II.

[Mikey88]

damn all this noise just to figure out obd 1 and 2 haha

[LA_phantom_240]

Unplug the VSS and drive the car long enough to trip the CEL, then pull up the code. If it's code 114, it's a 1995, OBD-I. If it's a code P0500, it's OBD-II.

Cool... but losing my speedometer temporarily just to find out is suckage lol.

Oh well. It must be done.

[Steveohoes]

I got a ecu out of a automatic s14, 1996.

The ecu says CB, is that ob1 or 2?

[projectRDM]

I got a ecu out of a automatic s14, 1996.

The ecu says CB, is that ob1 or 2?

1996 = OBD-II. Did you bother reading anything in the thread at all?

[phatkatsquad]

They use the EVAP canister, located in the rear of the car. It's a completely different type of system, it purges and filters based on solenoid control as well as engine vacuum, and flow is dictated by fuel temperature, ambient temperature, and other factors. The basic charcoal canisters purge all the time based on vacuum only.

If the car has a charcoal canister under the hood, beside the airbox, it's OBD-I.

WTF!!! flow not dictated by fuel temperature and ambient temperature. flow dictated by the ecu. cars gotta be at complete stop or constant speed shit if it was like that then the canister would be flooded with fuel making the car run RICH as fuck. come on think about fuel constantly moving round the tank and it can be sucked by the vaccum causing the canister to flood its only made to handle the fumes that are made in the tank.:duh:

[phatkatsquad]

1996 = OBD-II. Did you bother reading anything in the thread at all?


incorrect 1996 was the year it was required by fucking government to have OBD II. there were cars that had OBD II before it was required such as like the first manuf. to use it was toyota in 94 and ford.:ughd:

[importdude]

ok wtf?
i have a obd port under glove box?

does that mean i have obd1? lol??

i have a canister too????

but i had to buy a conversion harness to use the s13 ecu?????

[Bigsyke]

its obd1....its not that hard.

[importdude]

its obd1....its not that hard.

wtf why im i using a conversionharness for the s13 ecu then? duh let me go check it out lol

[projectRDM]

WTF!!! flow not dictated by fuel temperature and ambient temperature. flow dictated by the ecu. cars gotta be at complete stop or constant speed shit if it was like that then the canister would be flooded with fuel making the car run RICH as fuck. come on think about fuel constantly moving round the tank and it can be sucked by the vaccum causing the canister to flood its only made to handle the fumes that are made in the tank.:duh:

Um, no. You must be a fucking moron. The canister does not ever filter raw fuel. The canister is used to dispose of vapors in the tank, nothing more. There is nowhere near enough vacuum from the engine to actually pull fluid from the tank into the intake manifold, and there's a check valve off the tank that keeps fluid from going through anyway.
OBD-II cars do not use a basic vacuum canister, nor is it dependent solely on vacuum, it's controlled by other inputs from various sensors to the ECU, and then to the canister's purge solenoid. Read an FSM and get your head out of your ass.

[projectRDM]

incorrect 1996 was the year it was required by fucking government to have OBD II. there were cars that had OBD II before it was required such as like the first manuf. to use it was toyota in 94 and ford.:ughd:

You're quoting me saying 1996 = OBD-II, calling me wrong, then reinforcing what I said by saying 1996 is in fact OBD-II.

So, I was right, you're proving I was right, but you're calling me wrong. You're a fucking retard.