jet_jockey

I've read on a few threads that the 94+ es300 is OBDII, which has me at a loss, since the diagnostic hookup under my dash is a round OBDI type and not the rectangular OBDII. Whats the deal?

shuiyuan

it had both, i am using an odb2 reader on my 94 either way will work which i tried. i heard the odb2 on 94 is not fully functional,but it tells me everything about my car.

jet_jockey

was your diagnostic port under the steering wheel an obd I or II connector?

JSM1284

ODBII was required by federal law 96 +

jet_jockey

right. The 94 model es300 is apparently in between obd1 and 2. It still has the obd1 test ports, but every place I've looked and asked has stated that it is in fact an obd2 system.

Which brings me to my next question, has anyone tried jumping E1 and TE1 to retrieve codes? Mine does absolutely nothing when I try, so Im wondering if its a common thing or not.

shuiyuan

the odb2 port i used is under the steering wheel, same place as the fuses at. you can also use the old odb1 port, it also works.

92ES5sp

No it wont. Every 1mz-fe is OBDII. It dosent matter when it was mandated. You cant pull flash codes from it.

jet_jockey

thought so, thanks for the info. I wanted to know that before i dumped money on a obd1-2 scanner

jet_jockey

UPDATE: I actually ended up buying a scanner for it. I didn't realize the car has 3 data link connectors on it, there is the circular toyota obd-1 connector under the dash, there is oddball rectangular one on the engine, and then there is the obd-2 connector sitting right next to the fuse panel inside the car. However, its still not linking up on any of them

llcoolpass

transitional obd2 still means obd2, the port shuold still work. youre doing something wrong, most likely, or the diag machine you bought is brokn or the terminal is messed up

jet_jockey

It's kind of hard to screw this one up. You just plug it in and it links up. The scanner i bought is brand new, but just to *****s and giggles I hooked up another scanner I have laying around that I know works, and its the same deal, no pulse signal. So I tried both the under dash obd1 and obd2 ports with no results. So, tomorrow I get to start checking pins back at the ECM. Will keep you guys updated.

jet_jockey

update: After a good bit of testing, found out that the wire coming from the ecm that goes to Data Link Connector 3 (OBDII) signal wire, was dead. This wire also runs the length of the car, and stops at lots of places in between. After disconnecting it from the ECM , and then reconnecting it, we picked up a voltage feed on it again. At that point the vehicle started running good again, and the code scanner is working. So far we've isolated the problem down to either a bad wire connection at the ECM, or the ECM itself. I tried several times to replicate the problem by pulling on the wires and what not, but to no avail.

If it is a loose connection problem, then the probable cause is the audio system that I just installed a few weeks ago.

ckh1272

Just to ask the same question for a different year. Is there an OBD II port on a 1993 ES300 and where??

jet_jockey

the first obdII system came with the 1mz-fe engine, so no.