In case anyone doesn't know: each OBD II monitor depends on various (often many) things each of which must be OK before the monitor will complete (aka set aka ready).

Some monitors depend on one or more others.

Often, certain types of driving and/or engine on & off must occur - a little misleadingly known as "drive cycles" (some can be a cold soak overnight, i.e. no driving!).

It is perfectly possible that no code (DTC) will flag - because the monitors haven't set.

So, it can be that you get no codes to help diagnose why the monitors aren't all ready

The reason is that the PCM hasn't enough trustable values to diagnose what's wrong.

(If you're lucky you may get pending codes, but don't be surprised if you don't.)

Whenever you have a code DO NOT disconnect the battery and DO NOT erase the code without first thinking what you will do if you get into this mess of no codes and incomplete monitors. Scan tools should almost STOP you erasing codes, whereas they tend to issue almost no or no warning.

(BTW, Future OBD intends to mandate or already has mandated that codes will not be eraseable and will be kept across battery disconnects.)

(The above applies to pretty well every modern car, USA, Cdn, Europe, Japan, etc because they all have variants of OBD.)

Much of the jag OBD is documented such as in the codes PDF. There's more in there than people often realise, especially the first 10 or so pages. More is scattered in JTIS and there's more in various PDFs on TOPIx.

If you're in this situation and have tried the various drive cycles etc, and have agonised about any work done recently, one thing you can do is look very closely at sensor readings - hoping to see anything that looks odd. Well worth checking TSBs etc in case you have a known problem and/or there's a newer calibration (software version). Another is to swap parts Yet another is definitely to find a good tech for your specific kind of car! Experience counts.

By far the most important sensors are all the ones critical for engine control. See the car's tech guides / workshop) manuals for what they are (a longish list).

edit: some monitor info not in JTIS: http://www.obdclearinghouse.com/inde...t_file&id=1418

 

Sorry to hear about your monitors. The good news is that Jaguar had a bright idea. As the prescribed 2006 drive cycles did not change anything (as JAG V8 says "deinition of insanity..."), Jaguar tried 2004 drive cycles. Both monitors kicked in after one drive cycle. Still don't know what kicked them out in the first place. Good luck!!

 

Whatever works!!

 

I will have to look into that as I have never seen anything about the drive cycles being different. I will go onto Topix as well as Product Support on JBN as well as SSM section to look for some type of bulletin. If I find it I will post it.

 

jaxkr - for an XKR or what? What year - 2000? I thought they moved/closed JBN, where is it now please?

The 2006 has some changes (basically emissions-driven e.g. may be when the STR got SAIR, new PCM) so may have a different drive cycle (news to me, but can't say I ever looked). However, normally ordinary driving is good enough so I'd get worried if it were so fussy.

The earlier (1999-2002.5 & 2002.5-2005) cars (S-Types) have cycles as per code PDF/JTIS and that's all, as far as I know (and that PDF whose URL I just posted).

Anyone who lives very high can have issues but it's not common.

 

JBN is Jaguar Buisess Network, access to that has never changed. It is the site we use to get all the updates for sales service parts etc. It also is the link to all programs, invoices etc. It is used as a link between Jaguar & the dealers.

 

I think I know/knew it as JBNONLINE. Not for me lol. Except I'm always after info

So, a 2000 XKR? With which 4 not set?

Gotta say I can't see a drive cycle as the fix unless this is a very recent issue (i.e. hardly any miles since codes/monitors cleared).