Wow, passed with no cat. This is no longer the stone ages, man - modern metal substrate cats are inexpensive, reliable, and rob essentially no power. All my street cars have cats now, including a turbo Elise

 

i had a similar problem a couple of months ago (OBD2 Port Not Working - LotusTalk - The Lotus Cars Community). No reflash, but the OBDII port just quit working. Just as mysteriosly, it started working again and no problems since. Have you checked the fuse yet?

 

since hopefulyl now my posts wont disappear anymore i'll run through and post answers to some of these unanswered questions....

the OBD II in the elise, is very strict it runs on the letter of the 'law' for the specification for the timing, so it means a lot of scanners just don't work. The lotus scanner should always work, if it doesn't its probably something wrong with the plug or wiring, but its hard to diagnose without some equipment.

People often ask me if one person bought a scann,er then someone else buys the same one later, it doesn't work, well its because the scanners are often different inside, different software, cheaper revision boards, different batch so it just doesn't work. The 2008+ cars ought to have less issues since they're CAN line which is way tighter on the specs, and just an easier protocol.

none of my flashes alter the obd ii stuff, so it shouldn't make a jot of difference.

 

The dealer offered to check it out for free so ran it by them yesterday. Apparently, tech was familiar with my car and has never been able to get the Lotus scanner to read it. They weren't able to offer any other help besides "call Charlie".

Charlie, thanks for confirming that. I'll start looking into the wiring. This car was torn down to the frame during it's rebuild, so it wouldn't surprise me if something got missed.

 

I have a charliex tune on my Exige... no problem with the OBD-II scanners I have reading data. There's another issue with the Lotus ECU sending signals over both the K-line and CANBUS OBD-II protocols (which can confuse scanners or cause interference with the instrument cluster), but that has nothing to do with Charlie's tune, it's a Lotus thing.

 

Well after almost a year, I finally decided to see what was up with this. Having already been over every inch of the harness and finding it spotless, I sent the ecu back to Charlie. He had it diagnosed and repaired overnight.

Apparently the problem was a toasted K line (?) chip. It would have been caused by either a short, or plugging the wrong tool into the diag port. Since my harness checks out, I'm assuming the latter. It's been working great ever since.

Despite being unrelated to the reflash, Charlie fixed it free of charge. Awesome. The most impressive part is that I'm not even the original owner. It's great to see that these products continue to receive support on the 2nd hand market. The downside is that now I feel like a freeloader.

 

Hi there! New member here needing some helpful advice along these same lines. 2005 Elise. I’ve searched this forum and read all I can find on the subject but still have some questions. My obd port is not communicating with a Texas inspection machine or different scan tools. I’ve done the basics; check fuses, power and continuity of the obd ground and everything is good. Just had the car for 2 weeks so know little about it so far. I do know it has a lotus sport ecu. Some people tell me that may be the issue others say it should not affect the obd communication. Also I read about possibly issues with a K-line transceiver but I have no idea what that is or how to check it. If someone could help I’d be very appreciative. I can’t register my car for road use until I figure this issue out keeping the obd from talking to the state machines. Thanks!

 

Easy way out is to swap out the ECU with a known good one and flash the VIN onto it. There was a 2005 ECU for sale here recently.

 

Thanks, if you find it, let me know. I can’t seem to find any for sale here. Ones for sale on eBay and Facebook are either A’s or overpriced.

 

have you tried forcing a scan tool to use the iso 9141-2 protocol? this can be done with a bluetooth obd dongle, and a bluetooth serial terminal program. or, @aburastar888 's digital dashboard program, i think. or even my DaftOBD Java program (+VAG com cable).

also, i think there's no reason to reject an A ecu, in case you need an extra.

 

All that for nothing! Turns out the obd connection on an Elise is like the toilet in the east wing of the White House. All you have to do is giggle the handle? literally all it took to get it to connect, wiggled the port while connecting it. Finicky little cars.

 

Just to confirm @Obeisance comment that 2005 Elise seems to have to force the ISO 9141-2 protocol. One local gentleman purchased my ADD_111R app and reported the app doesn't work initially on his beautiful 2005 Elise, and we fixed it with the updated SW!

Take a look at my app ADD-111R and it's available at the google play ADD-111R

BTW, thank you @Obeisance, with your help, I updated the gear info (directly from ECU) and added the TPMS in my latest version of ADD-111R

 

Hi, not sure if anyone can still see or help out with this but I'm desperately looking for someone/mechanic to fix my boss's 2005 Lotus Elise which he got from a dealership (and somehow had undisclosed issues: Faulty Fan Motor and Air Conditioner, Malfunctioning Fuel Tank Indicator, Unreprogrammed ECU after Replacement and another issue was the VIN off OBD didn't match VIN on body. Can anyone please help/recommend the right person/mechanic/service center to fix this? Thank you!!

 

Your AC/fan issue is most likely a faulty resistor pack which there's an upgrade for. This requires front clam removal to replace. VIN mismatch can be fixed using OBD tool. Use G search to find the threads on each and end your search with lotustalk. That will direct you to the thread here. IE Elise VIN mismatch lotustalk here's one of many threads and it will guide you on how to reenter your VIN. Do the same for the resistor pack upgrade.

How to Partially DIY Set the VIN in the ECU for your...

A couple people have asked so I'm posting this here for everyone in case they need to clear their CEL with trouble code P0630. GET THIS: BAFX Products 34t5 Bluetooth OBDII Scan Tool - https://www.amazon.com/gp/product/B005NLQAHS/ Download ElmBasic for Android. Try these commands: # AT Set...

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LT is a US centric forum and while we have members all over the world we're not familiar with mechanics outside the US.