Good evening. I have a 2001 XJR with 98K. This past week driving 70 on the freeway it went into Engine Failure Mode with the warnings Trac Not Available and ASC Not Avaialble.The engine went into limp home mode and would only travel about 25 mph. Pulled over, stopped and turned it off for a couple minutes each time. It would start back up then go into same mode. Sat on the side of the freeway with engine off for 20 minutes, restarted and it worked OK driving another 60 miles homes. Since then it has intermittently done the same thing about every day on short trips around town. Any ideas on where to start with this?

 

Hello and welcome to jaguarforums.com. I know that you are anxious to get started and we are anxious to meet you and talk about your car. We have a baseline / criteria that must be met before full access can be granted. Please enjoy the forum and be patient once the baseline has been satisfied full access will be granted. Please continue to post and accept my welcome to the forum.

Oh one other thing you need to put your car details in your signature. I am speaking of the Year, Make & Model. Without it you may not get the input you are looking for.

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We have many posts on this topic but the first thing I would do is first check the codes and post them. We can help you with the rest.

 

Thanks- here is info I got today:

code reader shows code P1122 and P1121

P1122 Throttle body (TP) sensor circuit intermittent low input
ECM detected an intermittent low voltage on the TP sensor signal

Probable cause
1- Failed TP Sensor
2- Intermittent open or short circuit condition on the signal wire

P1121 TP Sensor inconsistent with MAF sensor condition
Sensor signal output not consistent with engine load measurement

Probable Cause
1- Open or shorted electrical condition
2- Failed TPS

 

George, you need to post this over in the 'Tech' sections for your car.

Here is all about meeting and greeting.

Welcome to the forum.

 

That MY had a problem with the plug connector compatibility and a TSB was put out for this situation http://www.gusglikas.com/AutoRepTB.htm I would clean and tighten the connections and see if that clears the problem. If it does not then I would look into TB. I pulled the codes and I think this covers your car http://www.gusglikas.com/images/Auto...J27%201999.pdf I hope this helps.

 

Welcome to the forum George,

Hope you find the fault with the info from Gus, if not please continue the discussion in the XJR forum.

 

George I would send you a PM but you are to new. It looks like you need a throttle body, I have a good used unit if you are interested. It came off a 2002 XJR. I used it on my car for about a month before taking it off.

 

Only 66k, mine is doing the same thing intermittently. (Funny thing was when I left the church dropping my kids off this morning for an activity. Pulling out on to the road, I "goosed" it to get ahead of the oncoming traffic...screaming tires and smoke everywhere. Reminiscing of high school and my '71 Cutlass)

Not so funny though for my daily driver -- need to get this fixed.

Someone said there was a TSB for it? Is that reference-able so I can take it to the dealer and say, "FIX THIS!"?

-ns

 

You can read it in the link Gus posted.

And, no. It was an advisory relating to cars under warranty, not a recall. So, once out of warranty, it is chargeable work.

 

Hmmm...never knew that a TSB was only applicable to cars under warranty. Nonetheless, having that info in my back pocket will make for a good argument next time I'm in for service. Never hurts to try! Thanks -- and I checked the link. Got a few hours of daylight left, so plenty of time to give it a look. Thanks again!

 

It's only going to be an exercise in frustration.

The car is ten years old. The only obligation on Jaguar's part was to make it last through the warranty period. It apparently has.