Hi: Just today I swapped my X-type for a XJ8. A few days prior, the XJ8 had its battery disconnected for several hours while the AC was worked on. When it was taken for its mandatory emission retest today as part of title and plate transfer, it "told" the OBD computer it has not had enough time to "learn" a full driving cycle. How long or how many miles or how will I know when the computer has enough information to allow OBD testing? Thank you. --Tom in Tucson AZ

 

It's complicated but detailed in the workshop manual / codes PDF under drive cycle.

It may happen without you doing anything special but can take a while so the above can help. Do NOT clear OBD codes or disconnect battery as it will then start again from scratch.

Read up on P1000 and P1111 on this site

 

Somewhere recently, perhaps in the owner's manuals I downloaded yesterday, I read that it takes about 10 miles of driving after the battery is disconnected for the engine to "re-learn" its stratagies.

Oh, here it is:

The engine electronic control system
adapts to certain characteristics of the
vehicle. These adaptations are lost if the
battery is disconnected.
On reconnection, therefore, some slightly
abnormal drive symptoms may occur and
the vehicle may need to be driven
16 kilometres (10 miles) or more while the
control system re-adapts.

 

It actually is a little more complicated than that, there are various drive cycles that have to be carried out. It is described in detail in the workshop manual.

Mine took a couple of hundred miles to complete. YMMV.

Check it out here...https://www.jaguarforums.com/forum/x...9/#post1031765

 

A hundred miles or so is not abnormal for all monitors to 'set' properly and produce the important P1111 code. Make sure that there's no more than about 3/4 and no less than 1/4 tank of gas while driving around. This is mandatory for the EVAP system.

 

OK this helps. I was thinking of taking it to local autozone for free OBD code read but will make sure their machine does not clear my car; I do not want to keep starting over! Thank you.

 

Dealer svc advisor told me there is no way to circumvent this process. He printed out the specific pattern that must be driven exactly to calibrate the evap fuel recovery system. He says that is the one least likely to be accomplished in normal driving without going to pains. Autozone confirms code is P1000.

 

It's much faster to follow the manual - post #2

 

I had that same issue when I bought my XJ8L. The first time on the test, the car got a not ready message. I then took it on about 100 mile run on the freeway and then the car passed.

 

Does this P1000 come up as a pending code any time the battery is disconnected and require that all drive cycles be completed successfully?

I was contemplating resetting my SV8 by disconnecting the battery cables and touching them together for 30 seconds as recommended for a re-set, but I don't want to start the learning process all over.

I am sure the battery was replaced shortly before I bought it and drove it 600 miles home with the CEL on and P0171 and P0174 set because (I found later) the car lot mechanic had left the PCV valve disconnected. I reconnected the PCV, erased the codes, and my UltraGauge has not shown any set or pending codes since. So perhaps the UG does not read P1000 or P1111?

 

Yes.

There's no reason to 'reset' anything using that method. Not sure who recommended such a thing.

 

It's worth doing (and recommended) if an emissions-related repair has been done, so that fuelling is relearned from scratch. Yes it'll cause P1000.

Otherwise, just causes a pointless relearn and if unlucky can get stuck due to a fault it would otherwise have flagged but now can't. At which (rare) point diagnosis becomes tough.

If/When the OBD monitors are OK you get P1111.

 

Dealer provided free four page handout of instructions which I followed. Car did pass today. EGR and O2 sensors had been the hangups I think but all academic now. Total elapsed miles from disconnect to pass was around 150. THank you all for advice.