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Emissions test failure - no OBDII communication
I have a '97 Lexus ES300 (131K miles). My Connecticut Emissions test
failed today due to no OBDII communication. The guy said he couldn't get a reading. He suggested it could be as simple as a blown fuse or as complex as the computer itself. I did some search on google and various forums. It was suggested to check the cigarette lighter as an indicator of a blown fuse. My cigarette lighter works fine. I use that to charge my cellphone daily. What other fuse could I look at? Where would be the location of the fuse? If the fuse is fine, what else do I need to look into? I would appreciate any help I can get. Thank you in advance! |
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Emissions test failure - no OBDII communication
On 2011-03-08, Mark > wrote:
> I have a '97 Lexus ES300 (131K miles). My Connecticut Emissions test > failed today due to no OBDII communication. The guy said he couldn't > get a reading. He suggested it could be as simple as a blown fuse or > as complex as the computer itself. > > I did some search on google and various forums. It was suggested to > check the cigarette lighter as an indicator of a blown fuse. My > cigarette lighter works fine. I use that to charge my cellphone daily. > > What other fuse could I look at? Where would be the location of the > fuse? If the fuse is fine, what else do I need to look into? > > I would appreciate any help I can get. Thank you in advance! Could be a bent pin on his code reader too... it seems very odd that a computer would just stop communicating. You'd probably know it if the computer had lost power too. You could try buying your own OBD2 reader or see if someone else's works, like at auto repair place or parts store. |
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Emissions test failure - no OBDII communication
On Mar 8, 1:40*pm, Brent > wrote:
> Could be a bent pin on his code reader too... it seems very odd that a > computer would just stop communicating. You'd probably know it if the > computer had lost power too. > > You could try buying your own OBD2 reader or see if someone else's > works, like at auto repair place or parts store. I doubt it was his code reader as another guy just ahead of me successfully passed the test. I will still borrow a OBDII reader to see if I get any different results. Assuming I get the same communication error, what do I need to look into? Thank you. |
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Emissions test failure - no OBDII communication
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Emissions test failure - no OBDII communication
On Mar 8, 2:47*pm, Tegger > wrote:
> > Was the tech using a CAN-compliant reader to check your non-CAN system? > > -- I am not sure about that, but I have been going to the same place for the past 6+ years. I have not had any issues in my previous 3 tests at the same place. And it is the same guy I have been seeing since then. |
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Emissions test failure - no OBDII communication
"Mark" wrote in message
>I have a '97 Lexus ES300 (131K miles). My Connecticut Emissions test > failed today due to no OBDII communication. The guy said he couldn't > get a reading. He suggested it could be as simple as a blown fuse or > as complex as the computer itself. > > I did some search on google and various forums. It was suggested to > check the cigarette lighter as an indicator of a blown fuse. My > cigarette lighter works fine. I use that to charge my cellphone > daily. > > What other fuse could I look at? Where would be the location of the > fuse? If the fuse is fine, what else do I need to look into? > > I would appreciate any help I can get. Thank you in advance! You will need to get the factory service manual set of books (would include electrical diagrams and emissions [computer] book) and follow the troubleshooting instructions. That set of books typically costs around $150 as there can be 4 books to the set and 2000 pages total. Order from dealer for your specific vehicle. But if there are multiple computers on the vehicle along with computer local area networks, then troubleshooting might also require the use of specialized computer diagnostic equipment. If any do-it-yourself wiring has been done, this could have tapped into a computer network wire. Try undoing that if this was done. Also look at the OBD electrical connector and see if there are any bent pins. As to fuses, here is testing instructions... http://www.dinosaurelectronics.com/Test_Fuse.htm Otherwise I would suggest you take it to a Lexus dealer as they would have the service documentation and computer testing equipment. Note: Modern vehicles can have multiple computers and multiple computer networks. In some cases a computer network may not be working or one computer may not be working. Not something you could test with a "multimeter"! Rather you need to connect a computer to a network or working computer, then with that try "talking" to the other computers and see what is working and what is not. If you have just one computer, that makes it easier, but you may need to transfer a chip or have some programming done if the computer is replaced. A dealer thing for the programming. |
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Emissions test failure - no OBDII communication
Wow.. believe it or not, it was actually his code reader that was
problematic. I had a new OBDII scanner that I got from amazon a few months ago. Just for curiosity, I hooked it up and it was able to get a reading. So I took it back to him and passed the emissions this time. I didn't think it was his code reader as I saw 2 guys, before and after me, pass the emissions while I was there. So somehow his code reader didn't work only on my car. But today it took just a minute for him to get a reading and give me a Pass certificate. Thanks all for your help. |
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Emissions test failure - no OBDII communication
I have a very similar issue with my 1997 ES300 Lexus (I'm the original owner). 3 days ago I went to get a smog done but failed because of no OBD signal communication during testing (a first). The car is a low mileage (110) and previously had passed all other smog testing(last passed 2yrs ago). Vehicle gets its routine maintenance fluids/oil/ filters, belts, wipers, brakes, transmission/radiator flush and new battery to name a few but never had any major mechanical repairs or modifications performed on the car. Aside from this current issue the car sounds and runs fine. Never experienced dashboard lights or a check engine light. I have done some online reading a common problem seems to be the cigarette lighter fuse but both of mine work since I use them to charge my cell phone and Ipad on daily basis.
When I get home, plan on doing a visual inspection of the DLC for an bent or damaged pins. I also read something about the OBD fuse that could also cause this problem. Any help is greatly appreciated before I have to visit the dreaded dealership. Mark what brand of OBD reader did you use? |
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Emissions test failure - no OBDII communication
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