Cat Not Ready?
 

I have a problem that seems to be a tough one. After not driving my car for several weeks the battery discharged. I charged it and all was good until I need to have it smogged and received Cat Not Ready. All else is good.
Has anyone ever found a fix for this. After hundreds of miles and many drive cycles, I still have the problem!

Hi hbrown02,

Welcome to the Jaguar Forums! It's great to have you with us.

I have moved your post to start your own thread since your details are somewhat different from those of the Original Poster (OP) in the other thread.

I see from your introduction that you have a 2001 XJ8. It's a good idea to add this information to your signature so others don't have to ask in order to offer accurate responses. It also helps to add the engine displacement (4.0L?) and mileage on the odometer.

I'm not familiar with a "Cat Not Ready" message, but from the information you supplied it seems possible that the smog testing station found the Diagnostic Trouble Code (DTC) P1000 was flagged, which means "System checks not complete since last memory clear."

Typically, this indicates that the necessary drive cycles have not been completed for all the Engine Control Module's self-tests to be performed and passed since one or more DTCs were cleared with an OBD scan tool or the battery was disconnected or discharged.

Here's some relevant info from page 3 of the Diagnostic Trouble Codes Summaries Guide, which you can download here:

Jaguar X308 AJ27 DTC Summaries Guide 2001

https://cimg0.ibsrv.net/gimg/www.jag...b37828eb0b.png

In order to be of additional assistance, we really need to have more information. Is P1000 still flagged? Does the car have any other DTCs flagged? What is your battery voltage after the car has been sitting overnight? How low does the battery voltage sag while cranking the engine to start? Most auto parts stores will scan for DTCs and do a basic check of the battery and charging system for free.

Cheers,

Don

Chances are there's a fault and it's stopping the monitor, thus the P1000.

If you're lucky there may be a pending code to hint at what's wrong but otherwise it's Catch-22: car would like to say what's wrong but unset monitor means it's not sure which data it can trust so can't flag code(s).

Endless driving is not likely to help. Sometimes there's a pending code or live data shows (look carefully!) something you can tell is not right.

Cat Not Ready
 

Thank you for the response!


I have a 2001 Jaguar XJ8 with a 4.0L engine. The engine has 189k miles. The only DTC flagged is P1000. The Engine Management monitor, Catalyst Efficiency Monitor is the test that does not pass, hence Cat Not Ready. I contacted the local Jaguar dealer and received this information:


HERE ARE THE REQUIRED STEPS TO PERFORMED THE DRIVE CYCLE FOR THE CATALYTIC CONVERTERS. GOOD LUCK!

CATALYST EFFICIENCY MONITOR DRIVE CYCLE
1. Start engine and bring to normal operating temperature > 75 °C (167 °F).
2. With the gear selector in Park or Neutral, hold the engine speed at 2500 rpm for 5 minutes.
3. Drive vehicle ensuring that vehicle speed exceeds 15 km/h (10 mph) and the engine speed exceeds 1500
rpm.
4. Stop the vehicle and check for any temporary DTCs using WDS



I have performed this test several times and still have the same issue. All other monitors cleared within a few days of driving.




Voltage test was fine, problem only existed after several weeks of not being started.
As long as error appears, the car will not pass the State Smog Inspection.

I feel your pain. I recently cleared my DTCs after making a few repairs that caused the codes. I have driven over 500 miles since then (highway, in town, stop and go), and the Cat Sensor will not reset. I've tried several different recommended rituals with no luck. I am wondering now if I simply have a faulty sensor, which may also be your situation.


Fortunately, the Nashville test requirements will allow you to pass with one sensor that has not reset, so mine passed yesterday. Good luck.

Once you know which OBD monitor(s) don't set you can try to figure why:
1. actual codes?
2. pending codes?
3. live data - check sensors and fuel trims
4. mode 6 (e.g. can signal such as partial EGR failure)

Ugh, I am going through this now - 230 miles and still have several modules not ready :(

What can I do to ready them? I've already followed the cruise at 55 then coast procedure.

Ugh, I am going through this now - 230 miles and still have several modules not ready https://www.jaguarforums.com/forum/i...lies/frown.gif

What can I do to ready them? I've already followed the cruise at 55 then coast to 20
https://cimg5.ibsrv.net/gimg/www.jag...573aebec19.jpg
procedure.

this problem afflicted a friend with a different car and his mechanic came up with a great idea. they took the car to one of those dyno tuning shops with a rolling road type machine and ran numerous scenarios. the techs there were very nice and knew vehicle computers in so the exact procedure for the particular car was followed. what he paid them was much less in comparison to the amount of gasoline not to mention the aggravation and time to futilely do it himself. they were also able to figure out one small issue that would not allow the system to complete all of the tests.

try searching for a shop that specializes in re-mapping computers and dyno tuning.

What did you do that cleared the monitors? And why?

Then see post #6.

IMPORTANT: do NOT mulit-post on different forums!! I see https://www.jaguarforums.com/forum/x...e-66702/page4/

Also, what CAR do you have???

IMPORTANT: do NOT mulit-post on different forums!! I see https://www.jaguarforums.com/forum/x...-ready-184319/

Also, what CAR do you have???

Hi vdpnyc,

I have moved your posts from another thread here, so all replies will arrive in the same place and avoid confusion and duplicate effort on the part of others who want to help. As JagV8 has requested, please let us know the year, model and engine of your Jaguar so we can provide the most accurate and helpful replies.

Cheers,

Don

Don, I did not mean to post in this thread, only on the x308 forum. Unfortunately you lost the attachment showing the modules when moving the threads, and for some reason my signature saying "2002 VDP" is not showing so others cannot see that I've got an x308 (the checkbox is set to show-sig in my forum settings.)
[update] I unchecked and rechecked the show-sig box and now the sig is showing again...

JagV8, I've 3 modules that are not ready but got no codes actual, pending or historic besides the expected p1000. Live data sensors all show as passing and no check engine light. Any guidelines to get the modules ready? I've already followed the 55mph coast to 20 procedures.

What is Mode 6?

What led up to the P1000?
Did you clear codes or what?
And why?
What problem(s)/fix(es) were there?

(P1000 did not just happen - something caused it.)

Battery was disconnected for several months, otherwise no issues.

Don, thank you for consolidating all the posts to this thread

​​​​​​The idea of going to a tuner shop is genius, but I don't think we have any in New York City (not sure though )

Ugh, I just scanned the car again after 250 miles of driving and now comprehensive comp is showing unready, in addition to the other 3 from before - how is that even possible?! It reverted from ready to unready!

Hi vdpnyc,

I moved all your posts back to this thread per your request. In post #8 I can see the image showing which readiness monitors have not completed. If I understand correctly, it appears the monitors for Misfires, Fuel System, and Catalyst are all supported by your car, but have not completed. I'm as surprised as you that you don't have at least P0300 or a cylinder-specific misfire code.

Given that the Fuel System monitor has not completed, I wonder if you have a problem with low fuel pressure that could cause random misfires that aren't triggering any DTCs but are preventing the readiness monitor from completing. Another question would be, how long since your last good tune-up (plugs, fuel filter, air filter, cleaning all the important ground points, etc.)?

Beginning on pdf page 3 of the attached document are Jaguar drive cycles for resetting specific readiness monitors. I hope they help.

Cheers,

Don

Don, thank you. That document says 2004, the last x308 was in 2003, are those procedures accurate for my car?

Tune up, that's a good joke, lol. My car is all OEM from 2002 and still drives beautifully on the original plugs, coils, injectors and filters. I've checked the airbox a few years ago and it was relatively clean, obviously the oil filter has been changed. Regardless, if there was an issue that was visible to the sensors it would throw a code, I've got no codes at all besides p1000 so it's not likely an issue of old parts.

Hi vdpnyc,

Your car has the Denso 16-bit Engine Management System and the 2004 cars have the Denso 32-bit EMS, but as far as I know, the OBDII standards and on-board monitoring were the same for both years. I believe it was 2001 when the EPA changed the standard from allowing up to two unset readiness monitors to allowing only one. Unless you have a better idea, I think it would be worth trying the drive cycles in that 2004 manual.

Also, since mysterious malfunctions are due to multiple components operating just a little outside of specification, my recommendation would be to change your 16-year-old spark plugs and fuel filter, check and probably change your air filter, and clean the ground points associated with the Engine Management System and the engine ground strap. You can find these in the Electrical Guide at the link below. A partially-clogged fuel filter makes the fuel pump work harder, so don't be surprised if you learn your pump is failing prematurely.

A tune-up may resolve your issues altogether, but at the very least you will eliminate the renewed components as possible contributors to the malfunctions.

Jaguar X308 Electrical Guide 2002

Cheers,

Don

Honestly, I appreciate the help but to follow those suggestions and repair seemingly-working components because they're old is just guessing. I don't know how to fix this, but the last thing I'm going to do is sink unnecessary money into the car before it passes inspection.

That document starts with specifying the vehicles it applies to, and it says clearly that it is the aluminum bodied x350, so those procedures are not going to resolve x308 issues and would be a waste of time/gas trying. I've tried several times the procedures in the obd-11 document previously attached and to my dismay it made another module go from ready back to unready. Does anyone have the recommended procedure for an x308?

Just saw on another forum someone recommended hard resetting the car when it didn't get ready quickly, at this point I think I'm going to try that as this is looking hopeless any other way.

Replacing spark plugs and filters is not guessing, it's basic maintenance, required on every automobile manufactured since 1886. Jaguar engines are so smooth that it's common for them to run suboptimally without the driver knowing, until the malfunctions worsen. But since you are averse to spending money on basic maintenance items, or even the gasoline to try some drive cycles, perhaps you'll have enough saved up to pay for new catalytic converters when yours fail prematurely due to undetected misfires.

I just ran into this problem as well. Have you gone for your emission/smog test? I got fed up and went in and it passed with the cat not ready. In Ontario, canada there is also the option of doing a tailpipe test if you fail the computer test twice. Maybe its worth giving it a shot.

Robert, thank you that is a great suggestion but apparently in NYC for cars after a certain year they don't do the smog test and rather rely on the OBD-II readings, and unfortunately it seems no shop would even hook the inspection-machine up so long as there is more than one module not ready when they initially plug in their code-scanners - I've been to 5 inspection stations already inquiring... This is not a fun problem :(

It'll be in the freely downloadable workshop manual I expect and may also be on JagRepair.com - Jaguar Repair Information Resource

Now that you've cleared the monitors it can easily be that the car can no longer figure what's wrong i.e. can't flag helpful codes.

If trying the drive cycle doesn't help you may be part-swapping or getting OBD live data and trying to grasp any hints in it - not easy.