Drive cycles to recalibrate emissions ?
My 2006 XJ8L flunked the state emissions inspection, because (after some recent engine work with the battery disconnected) it had not been driven far enough or under enough conditions for the system to recalibrate the engine.
Does anyone know how many miles or how many drive cycles or what conditions it takes for the system to recalibrate? Thanks.
Does anyone know how many miles or how many drive cycles or what conditions it takes for the system to recalibrate? Thanks.
Thanks ! I did some further online searching, and found a link to a file called drivecycle.pdf which has an 8-stage process (which may have to be repeated up to 5 times !!). The most amusing part of this process is that one is supposed to drive at 55 mph steady for a few minutes, then coast down to 20 mph without touching the shift selector or brakes. I will have to try to figure out where I can do this, without getting rear-ended or honked off the road or stopped by the police. Well, nothing is easy.
It seems such things are mainly needed when something is close to its tolerance. Otherwise you can set most monitors just by varied driving. The drive cycles can speed up the overall process.
However, some such as evap need specific conditions such as overnight cold soak and not too much or too little fuel in tank.
However, some such as evap need specific conditions such as overnight cold soak and not too much or too little fuel in tank.
Well, I did a number of drive cycles, including the coastdown process. All the monitors are now OK EXCEPT the Secondary Air System. Is there a specific drive cycle to initiate or reset this monitor? Or what the conditions need to be for this to happen? I have NO codes showing.
It may be there is a fault which it is struggling to flag with a code.
This may help http://www.teacher.starenvirotech.co...8%202006MY.pdf
This may help http://www.teacher.starenvirotech.co...8%202006MY.pdf
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Thanks ! I read through all 119 pages of the document. All sorts of flow charts, tables, and so on, including drive cycle requirements for many of the monitors. HOWEVER, no discussion at all as to what it takes for the Secondary Air System to be "ready" and not "incomplete" after a battery reconnect.
Evidently Massachusetts is one of the jurisdictions which will given an inspection pass, with ONE of the emissions systems not ready. So if this does not clear up, I will just proceed that way.
Evidently Massachusetts is one of the jurisdictions which will given an inspection pass, with ONE of the emissions systems not ready. So if this does not clear up, I will just proceed that way.
To Wingrider and others -
I have a generic OBD II code reader. It tells me that all the monitors are now set EXCEPT for the secondary air monitor, which is incomplete. I understand that with just one incomplete monitor, I should be able to pass the Massachusetts inspection. But I continue to be curious as to what conditions are required, in order to set the secondary oxygen monitor. Maybe the temperature has to be colder outside? Maybe it requires some (unknown) number of cold starts? (I've done about 10 or so since the battery reconnection) It's frustrating that this doesn't seem to be explicitly documented anywhere.
Besides the incomplete secondary air monitor, the code reader says "No codes." Not P1000 not anything.
I have a generic OBD II code reader. It tells me that all the monitors are now set EXCEPT for the secondary air monitor, which is incomplete. I understand that with just one incomplete monitor, I should be able to pass the Massachusetts inspection. But I continue to be curious as to what conditions are required, in order to set the secondary oxygen monitor. Maybe the temperature has to be colder outside? Maybe it requires some (unknown) number of cold starts? (I've done about 10 or so since the battery reconnection) It's frustrating that this doesn't seem to be explicitly documented anywhere.
Besides the incomplete secondary air monitor, the code reader says "No codes." Not P1000 not anything.
You really do need a Jaguar specific reader to navigate all the modules.
I have just purchased a $200 Foxwell NT510 reader.
With a free $60 Jaguar, Land Rover download, for $129 delivered.
A real pain to get it downloaded, but very nice when finished
Its a lot better reader than my icarsoft i930.
That is also a good jaguar specific reader.
But this one can program, & test, many modules, or so they claim.
So far it has proved to be a good investment.
I now can keep a jaguar specific reader in each car.
I have just purchased a $200 Foxwell NT510 reader.
With a free $60 Jaguar, Land Rover download, for $129 delivered.
A real pain to get it downloaded, but very nice when finished
Its a lot better reader than my icarsoft i930.
That is also a good jaguar specific reader.
But this one can program, & test, many modules, or so they claim.
So far it has proved to be a good investment.
I now can keep a jaguar specific reader in each car.
Sadly it may not help with this specific query, but will be very good for other issues.
On a good day when just one monitor can't set the car can flag pending codes to provide hints but it's not actually psychic so can struggle to guess what is wrong.
You may be able to stare at live data and figure something is marginal and probably to blame - allow plenty of time.
On a good day when just one monitor can't set the car can flag pending codes to provide hints but it's not actually psychic so can struggle to guess what is wrong.
You may be able to stare at live data and figure something is marginal and probably to blame - allow plenty of time.
Well, I passed my MA annual inspection with the Secondary Air System "not ready." After quite a bit of driving and a number of Drive Cycles. But one Not Ready is still a passing grade.
Now that the immediate problem is behind me, I still wonder what has happened. Before the inspection fun-and-games, I had had the water pump replaced. So I wonder - where does the wiring for the Secondary Air System go? Any of it get routed around or over the engine, where it might get disrupted by a water pump change?
Now that the immediate problem is behind me, I still wonder what has happened. Before the inspection fun-and-games, I had had the water pump replaced. So I wonder - where does the wiring for the Secondary Air System go? Any of it get routed around or over the engine, where it might get disrupted by a water pump change?
Well, I wanted to close out this thread. I took the car back to the mechanic who replaced the water pump, and asked him to check out the secondary air system. He claims that it all checked out OK, and that the outside temperature has to get cold before that part of the emissions cycle can run. So I will plug my scanner in from time to time come Fall, and see if that does in fact occur ....
JagV8 -
I didn't think that was correct, either, but I have not found any specific criteria for setting the SAI monitor. No codes have been set, so I don't know what to do other than to wait for colder weather.
I didn't think that was correct, either, but I have not found any specific criteria for setting the SAI monitor. No codes have been set, so I don't know what to do other than to wait for colder weather.








