Hey guys,

I have to relearn my car's misfire correction factors, so I bought a Foxwell NT530 OBDII reader so I can read the car's PCM to see if/when I've done this successfully.

Trouble is can't seem to get the Foxwell reader to connect to the PCM module.

I have a 2009 DBS LHD that has two ports -- one in the driver's footwell and one in the passenger's footwell. I'm guessing the passenger footwell port is the "Body" module, because when I connect to it, I can read some of the modules: doors, restraint system, etc.

However, when I connect to the port in the driver's footwell, I don't seem to get any information at all. When I let the OBDII reader attempt to connect automatically, it runs through all the various protocols and fails to establish a connection. Same thing when I try the protocols manually. (My battery has juice, and I have the key in the ignition.)

Any ideas on how I might get this to work?

Thanks!

 

Verify that you have it properly seated. I had the same issue with mine. I reached up and reseated it and it started working properly. You should be able to read the misfire codes.

On my DB9, it only took one time (up to 70 mph, then coast to 40) to have it learn the codes.

 

Thanks, just tried right now... no joy.

 

Thanks, yep. Tried both. Reader works fine on my BMW. And same results with engine running: reads "body" port but not OBDII. Gonna try a different reader in a couple days and see what happens.

You know I just realized... could be a blown fuse?? I'll check my Aston documents to see if I can find the fuse #.

 

I know I'm being Captain Obvious, but standardization isn't AM's strong point... My 2006 has both ports under the LHD steering wheel. I give them credit - they labeled them. FWIW, my Foxwell NT520 has no problem reading both off the OBD II and Body ports.

 

FYI, problem solved. Thanks for the help, all. I replaced a couple questionable fuses (doubt that did anything), but when I tried the passenger footwell port again with the engine running as Matt suggested, lo and behold, it worked. (I thought I'd already tried it with the engine running, but I must have only done it while plugged into the body port.)

Anyway, jumped on the freeway at 9pm and drove around for an hour with the scanner plugged in trying to re-learn the misfire correction factors, and alas, that was a bust. Couldn't nail em. Not sure what I did wrong, but I re-read the instructions, which say to do the procedure in 6th gear (for manual transmission), so I thinking perhaps that's the culprit. Will give it another go, though I might have to try at 3am next time. (I'm in SoCal, so even at 9pm at night there's enough traffic to make this a sketchy ordeal.) First world problems though, right?

Btw, this is a fantastic community. Grateful for everyone's contributions. Thanks again, everyone!

 

Turn off your A/C, make sure it isn't in sport mode, and coast down from 70 to 20mph. Mine learned it in one coast down and I recommend doing this very early in the morning and having the instructions with you in case you are pulled over, so you can show the officer. On the NT510, the item starts with "36-1." See if you've got that one in your device and that's the one to monitor, changing from NO to YES.