99xk was showing stability/limp checked the codes and problem related to throttle sensor replaced the TB and on firing up the stability fail light back on with limp did a hard disconnect of the negative battery cable unable to clear the limp.The signal returns with the key in the ignition system check and not starting the engine also have had the abs module reworked I sure need some help

 

This is the 2006 and later XK group. You need to post in the section for the earlier XK8 cars.

Also when you do, please post the actual codes you are getting (P????). The meaning of some codes varies for Jaguar and even for different Jaguar models and years.

 

Thanks for heads up I will correct

 

have 1999 xk8 with 2003 engine replaced throttle body now getting following codes 0122,0222, 1637,1647 and P0560 any help will be appricated thanks RD

 

Moving/merged these 2 posts to the XK8/XKR section for better response

regards,

 

You say a 99XK do you mean 99XK8 or XKR? Please post your codes then and now.

 

Gus - I just added the other post with codes - hope this helps in deciphering possible causes

 

I did see that!

 

Start with the P0560: Vehicle voltage malfunction

Possible causes from JTIS:
ECM battery power supply open circuit, high resistance or ECM ignition power supply open circuit, high resistance

If the ECM isn't getting the correct voltage then the other codes could just be a consequence of that.

The easy place to start would be the ECM fuse and relay in the small fuse box under the cover on the right hand side.

 

First did you just install this 2003 engine in this 99 or has it been running fine up to this point? Why did you replace the TB and when in relationship to the engine change?

 

gus thanks my error , I have a xk8 and the following codes are showing 1637,1647,0122,0222,0560 scanner shows low power unable to locate codes for jaguars that ar similar any help appricated Rich

 

engine change was 1+ years ago no relationship to current changed TB after all symptoms of throttle position sensor bad and a fail on the code \ got I got pretty proficient at disconnecting the neg, cable to clear the stability code. just checked a incomming suggestion to check ecm fuse .I really,really thank all for imputs will post all improvments Rich

 

Have you checked your battery?

 

battery checked six month old and showing full charge also have cleaned electric connections on TB and mass sensor all fuses ar good this is driving me to drink just kidding I appriciate any and all suggestions thanks again Rich

 

checked all fuses all OK what is the best way to check on the relay thanks for your excellent suggestions still stumped Rich

 

Have you checked the fuses in the small engine control fusebox on the passenger side (US car) near the ECU (under the cover near the firewall)?

 

Thanks to all who have replied I am still stuck so I obtained another tester and got a reading of P0122 and P0222 which spelled out sensor/circut B low input help help help its a 70 miles to a jag dealer who likes the big bucks thanks again

 

Did you see my question...this fusebox is not obvious:

Have you checked the fuses in the small engine control fusebox on the passenger side (US car) near the ECU (under the cover near the firewall)?

 

Is the tire in the trunk not securely fastened to be sure it is not bouncing against the high power module. Check and see if the fuses in the high power module in the trunk are not loose. USE CAUTION when moving them or tightening them they are directly off the battery. Disconnecting the battery before checking is a safe option.

 

I occaisionally get the same or similar problems on my wife's 1999 XK8 coupe. Manifests itself as ASC Fail and/or drops into limp home mode with or without engine check light.

Alternator puts out 13.85 volts at the battery (checked good under Sears warranty) and the battery reads 12.45 volts across the terminals with the ignition key out. A few days later the static voltage may be 12+ volts or in the low elevens. The starter always spins at the same speed irrespective but if the battery has floated or been drawn into the elevens I can almost guarantee a fault of some description.

Haven't read the codes as I haven't got a reader and, seeing as the faults are gated up from a low battery condition, I wouldn't have much faith in their veracity anyhow.

Good luck with it. If I find the reason for the drift down I'll post it. If anyone has any ideas I'd appreciate it.

Best regards.
Jim