1995 FZJ80 OBD-I/OBD-II "transition"

[sdnative]

I am a little confused here. I know that 95 was the transition year for OBD on the FZJ80. Does this mean that there was a OBD "1.5" or did Toyota simply change from 100% OBD-I to 100% OBD-II sometime during the 1995 production year?

I had always assumed that in 95 they added some additional monitoring, sensors, etc to OBD-I and then in 96 they fully complied with OBD-II. Now, I'm not so sure.

Can someone please clarify?

If they did change from 100% OBD-I to 100% OBD-II in 95, is there a production cutoff date or some way I can tell if it's OBD-II?

I am looking for a 96-97 due to the OBD-II, but may consider a 95 if it's OBD-II also.

Is there any downside to buying a 95 vs. a 96-97?

TIA

[cmtierney]

My '95 is OBD-II. The amount of telemetry coming off the computer is limited compared to more modern vehicles but the interface is definitely OBD-II.

Someone with more knowledge than I should be the final say, but I believe all '95s are OBD-II. Toyota just decided to implement it early on the '95s instead of waiting until '96 when it was mandated.

I have both a code reader and a telemetry converter for my laptop. They greatly helped in trouble shooting an air leak at the EGR valve base. The vehicle ran fine, but the CEL kept coming on but wasn't really helpful in finding the problem. The laptop was able to monitor the air/fuel mixture and I sprayed carb cleaner in various areas until I saw the indicator change.

[sdnative]

Thanks for the reply. Have you used a scan guage II by any chance with your 95?

Anybody else with some input?

[Tapage]

You will found ( read from another thread here ) in your engine bay, white with black letters sticker that claims for the Emisions ready SUV or Truck .. there is a clear adivice for the OBDII

[Lugboot]

Yes, there will definitely be a sticker on the hood if it's OBDII. The thought is that all the 95s were OBDII compliant. Mine's a 4/95 build date and it's OBDII. Got all the info when I plugged it into a scanner at work.

[landtank]

I think that since the government mandated that in 96 all vehicles had to be OBDII, people assume that vehicles prior to 96 were not. My daughters 94 Camry is OBDII.

[sdnative]

I realize that toyota could have implemented it in some vehicles before 96, but was always under the impression that the 95 FZJ80s either didn't have the full OBD-II interface -or- did have the OBD-II interface but had a limited set of diagnostic parameters compared to the 96+.

I am unsure if OBD-II simply defines the interface or the interface and the diagnostic parameters. I am going to search for this now. Be right back....

Thanks for everyones help.

[BlueHZT60]

Originally Posted by sdnative

Thanks for the reply. Have you used a scan guage II by any chance with your 95?

Anybody else with some input?

Scan Guage works fine on my 95 w/94 engine in it. So far I've got a bad VSS & O2 to deal with. I just keep resetting the computer for now. 1400 miles and it hasn't come back on.

[hj60]

Originally Posted by sdnative

I am unsure if OBD-II simply defines the interface or the interface and the diagnostic parameters. I am going to search for this now. Be right back....

OBD-II is a fluid thing. Early OBD-II was very basic and not much better than OBD-I. It really just added a couple of monitors and a standard data link connector. The OBD-I connectors differed by manufacturer (and, in some cases, by vehicle).
The last of the OBD-II systems had (or have. I can't remember if CAN is mandated yet or not. The newest passenger vehicle in my fleet is an '06 and it's still OBD-II) as much information as NASA and Cheyanne Mtn.

An example is misfire monitor.
Early OBD-II would tell you you had a misfire.
Later will tell you which cylinder, when, how many times it happened and all other sensor readings from the last 2 minutes (at least on my scantool) up to the most recent event.

Unfortunately, I have 0 experience with OBD-II on Toyotas, as the powers that be decided the Colorado and Silverado are better buys than the Tacoma and Tundra.

[Lugboot]

Originally Posted by hj60

snip.... I can't remember if CAN is mandated yet or not. The newest passenger vehicle in my fleet is an '06 and it's still OBD-II) as much information as NASA and Cheyanne Mtn.

CAN became mandatory with the 2008 MY. But alot of manufacturers started implementing CAN in 2006 and 2007. Not that this has any bearing on 1995 80 series having OBDII... besides providing another example of manufacturers implementing something before the mandatory deadline, like OBDII...

[sdnative]

Originally Posted by hj60

OBD-II is a fluid thing. Early OBD-II was very basic and not much better than OBD-I. It really just added a couple of monitors and a standard data link connector. The OBD-I connectors differed by manufacturer (and, in some cases, by vehicle).

I guess what I am looking for is the ability to connect a scan gauge II to get fuel mileage, temperatures, etc.

Originally Posted by hj60

the powers that be decided the Colorado and Silverado are better buys than the Tacoma and Tundra.

Well, the Colorado and Silverado are clearly better vehicles

Originally Posted by Lugboot

CAN became mandatory with the 2008 MY. But alot of manufacturers started implementing CAN in 2006 and 2007. Not that this has any bearing on 1995 80 series having OBDII... besides providing another example of manufacturers implementing something before the mandatory deadline, like OBDII...

Interesting. I am a controls/automation guy and use devicenet, which is built on CAN. I think CAN is a great bus/protocol for this application. Each sensor is simply a node on the network.

[Lugboot]

Here's the list of what I got the last time I hooked my truck up:

http://forum.ih8mud.com/80-series-te...ome-obdii.html

A scangauge should give you the same, I would think.

[CJF]

Originally Posted by hj60

Unfortunately, I have 0 experience with OBD-II on Toyotas, as the powers that be decided the Colorado and Silverado are better buys than the Tacoma and Tundra.

Originally Posted by sdnative

Well, the Colorado and Silverado are clearly better vehicles

I'm guessing the powers that be are female.