I just got the 2001 XK8 running after it was stored for years. I need to get the vehicle to pass California Smog before it can complete the registration process. The Check engine light is not on on and the car runs well, when i take it in to get smog check they connect to the on Board computer and read an error code "CCM" which i understand stands for Comprehensive Computer Monitor. The mechanic at the Jaguar garage told me to keep driving the car for ? miles and it will reset. I have drove the car 250 miles and it still does not clear as i attempted to redo the smog. Anyone know how to drive it that the on board computer will reset? How many miles does it take to clear the code?

 

Hi Bob,

Congratulations on getting your Jaguar running again.

I have moved your post from the General Tech forum to the forum for the X100, which is the Jaguar factory project code for your 2001 XK8. Here you will find knowledgeable owners of similar cars.

The Comprehensive Component Monitor will not complete if one of the several sensors it monitors is providing a signal that is out of range or intermittent. Here's what a relevant manual has to say (I'm attaching the complete manual below):



I am not aware of a specific drive cycle specified by Jaguar for clearing the CCM, and if it has not cleared in 250 miles, I would suspect that one of the sensors is lazy or out of range or its signal is intermittent. It would be worth cleaning the connectors for all the sensors listed. If that doesn't solve the problem, you could monitor the sensor signals via Live Data (with an OBDII scan tool) to see if any sensor signals appear out of range or implausible.

Cheers,

Don

 

It took me over 200 miles of driving to clear the Comprehensive Component Monitor after a repair in my wife's 2006 XK8 back in November. After another required repair in early January, I was able to clear the Comprehensive Component Monitor again in less than 30 miles of driving. It took persistence and driving in 3rd gear using the J-Gate for a couple of miles, then coasting to a stop, then idling for more than 12 minutes. I also made sure that the fuel tank was approximately half full....

 

Jon,

Thank you for that helpful post. What prompted you to drive in 3rd gear? Did you have a written drive cycle? Off the top of my head, the drive cycles I have are for 4.2L engines - though maybe they'll work for the 4.0Ls as well.

Cheers,

Don

 

He'd also changed an O2 sensor IIRC.

 

Don,

I drove in 3rd gear because I needed to clear the Upstream Oxygen Sensor readiness monitor as well as the EGR readiness monitor. Both require driving in 3rd gear in order to clear them. I found that after I had done the necessary driving, coasting, and idling to clear these two monitors, I had also managed to clear the Comprehensive Component readiness monitor as well. That was completely unexpected but I was delighted to say the least....

When attempting to clear these various readiness monitors, you must be persistent and you must find a stretch of lonely road where you can perform these specific (and crazy) drive cycles multiple times without the threat of being run over from behind. I got much better at successfully completing these drive cycles as I gained experience doing them between mid-November and early January....