I have a 96 sc300. Which is suppose to be OBD II.

I used this web sight to try and find CEL light codes.

http://www.troublecodes.net/Lexus/

When I jump a wire on the DLC1 terminals. I get a flashing engine code of 25. Its clear as day and that is my only code.

So would an OBDII system do this? Or did someone probably swap an OBD1 system in?

Is a code reader necessary to read OBDII systems?

I'm confused.... Can I just look somewhere on teh ecm and tellif it's OBD1 or 2?

Thanks.

 

I think you have OBDII.

 

Right I know if your going by the year OBDII is correct. But according to the code readouts I'm guessing it's an OBDI. Can anyone confirm that jumping the two maint. terminals on an OBDII will give you codes?

 

Not 100% but I am pretty sure it doesn't. Just look at see if you have an OBDII diagnostic plug in or not under the steering wheel to the left.

Jonny

 

The car is a 96 so it has the OBDII port, but that doesn't mean it's hooked up to anything. But yes I do have that port.

 

Well go to Autozone and get them to hook up their scanner to it and see if it works

Jonny

 

Car is on jacks with all the suspension ripped out...

 

LOL - well I guess going to Autozone is out of the question I bought my own scanner which I get to use pretty often owning a Chevy as my DD!

Maybe you could buy one at an auto store, and then change your mind and return it

Jonny

 

Wasnt the car an Na-T when you bought it?
If so it sounds like the ECU was swapped out for an OBD1 perhaps?

 

Yes it was, thats why I wanted to know if there was a way to tel which ECM it was just by looking at the box itself?

 

mmmm, good question. i know with hondas they have different ecu codes for the different cars. not sure about toyotas.

 

Just FYI I tried an OBD II scanner. Plugged right into the OBDII port powered up and just said "no link" on the display. Then I tried it on my mini van it it worked great.

I'm leaning towards OBD1. Still Id like to get a positive way to ID the ECM box.