Also not sure how wheels will slow down if there is no weight on the car/wheel.
I m not sure how speed is recorded? Are the sensors in front wheel or rear wheel ?

 

Wheel speed sensors are part of the rear brake system. At least on the V8V, but I'd imagine for the other models as well.

 

Can someone please advise what new horrors await me should I ever need a jump? It the DIY battery swap the procedure for getting to the terminals? Iiiieeeeee!!!

 

Jack stands are a really bad idea. Find a shop with a Dynamometer and strap it down good.

 

No, it's easy to jump. I believe there are jump points in the engine bay. You can also just pull the parcel shelf cover out to expose the battery and connect directly to it.

Yep... Definitely would NOT do this on jackstands - dyno would be much better if it works for the coast-down procedure.

When the engine revs under throttle, there's rotational torque. It's possible that it'd unsettle the car enough to wobble it and take the car off the jack stands.

 

Is this procedure needed for my 2009 Aston Martin DBS - Touchtronic? I replaced my battery last September 2015. I can't say I've experienced issues with any misfire or related symptoms however, this thread gives me cause for concern.

Any thoughts?

 

See this for details: aston1936.com/2016/03/18/relearning-the-misfire-correction-factors-on-an-aston-martin-db9/

Should be the same for a DBS.

 

When I replaced my clutch I had the battery disconnected for 2 weeks.

I reconnected the battery, reset the windows, and drove it on my normal journeys for 2 days. irish07 told me that if you have an OBD scanner that can show your readiness flag status, and if it shows that the misfire monitor flag is set, then your car has learned the misfire correction factors. When I checked the readiness status after 2 days of regular driving all the flags were set. I've driven about 1,000 miles since then and everything is the same. The service manual says that after the battery is disconnected you may notice some minor driveablity problems until all settings are relearned. But they imply that the settings will be relearned during normal driving.

 

I just completed this Coast Down Procedure - Misfire Factor Corrections process my 09 AM DBS Touchtronic over the weekend. It was both an event and process scheduling the fix while finding a clear road at 3am Sunday morning to complete this action = all in Aston Martin ownership .

It was both fun and challenging. I went overkill on the process completing the procedure a total of 6 six times on an incline and decline road...cycling through the 70 to 20mph drive while closely monitoring rpm's and road conditions.

I can only report that the car was becoming a little jerky over the past few months - especially on the transmission upshift as if the parameters were a little off.

I can now say that the car feels a lot more smooth on the drive and idle. I also topped off with a full tank of Shell Nitro premium fuel for icing on the cake.

I do not have a OBD reader to verify however, can only attest to the actual change in drive ability. The original item that led to this procedure was having to replace a dead battery a few months back.

Ultimately, I best recommend renting a dyno for an hour or half hour as the most efficient next time. Also, probably a good idea to have an OBD scanner next time to verify and validate the relearn.

Huge thanks to this peoples on this forum for sharing the tech = move love to the AM family

 

That sure is overkill! Renting a dyno would be even more over the top. The factors will eventually be re-learned after some normal driving. You only need to follow the accelerate-coast, repeat cycle if you want them to be learned RIGHT NOW, versus learning them in a few days of driving. With my car, it felt exactly the same the first time I drove it after reconnecting the battery as it does now 2000 mile later. I can't tell a difference with the factors learned or not.

 

It was also the same for me, my battery went dead over the winter, I recharged it and never got a CEL and thought that everything was good as the car was driving very good (only has 30,000km) but last week I visited an AM dealer to get my new KeyFob programmed for the car and they told me that Misfire Factor Corrections needed to be done on my car as it would never show me any misfire if they happen... I will try to do it over the next few day but would like to know which OBD-II scanner do you use to verify that it worked or not

 

Here's the best write-up I've run across: https://aston1936.com/2016/04/12/get...i-code-reader/

I drove my car for nearly 5 years and it never learned the misfire corrections on its own. By following the procedure I got them learned first time out.

 

YVR, what scanner do you have?? I have a Innova 3100i which I though it was a good OBD2 scanner but it doesn't seems to support Aston Martin...

 

I've got the Autel MaxiDiag Elite MD802, same as described in the link I provided.

I don't know of any OBD scanners that directly support AM.

 

Not sure that the Autel would also work on the V8 Vantage as we don't have 2 x 3.0l 6cyl like you guys do...