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This car frustrates me to no end. Car runs fine, with no codes thrown. After the car warms up and is shut off, "Restricted Performance" appears upon restart. If I turn the ignition on/off a dozen times or so, it disappears. Car has new Maf sensor, new coil packs, new plugs, new air filter, new fuel filter, new alternator, new radiator, new coolant expansion tank, new transmission cooling lines, transmission just completely serviced/flushed with new Ravenol fluid and filter. Car Burns/leaks no oil, recent oil change with Royal Purple brand synthetic and genuine Jaguar filter. Only premium gasoline used. What the hell could it be? 130,000 miles.
No mention of the battery. Usually a waste of time (and money?) pursuing electrical type problems without a good battery in a good state of charge. Any less than 12.4 volts after being left alone overnight is an indication of trouble.
try the engine water temp thermostat. i had this & found the stat had broken.
1999 XKR coupe 63000 miles stat , presume original.
The only thing shown on my mates reader was water temp
hope this helps
Andy
This car frustrates me to no end. Car runs fine, with no codes thrown. After the car warms up and is shut off, "Restricted Performance" appears upon restart. If I turn the ignition on/off a dozen times or so, it disappears. Car has new Maf sensor, new coil packs, new plugs, new air filter, new fuel filter, new alternator, new radiator, new coolant expansion tank, new transmission cooling lines, transmission just completely serviced/flushed with new Ravenol fluid and filter. Car Burns/leaks no oil, recent oil change with Royal Purple brand synthetic and genuine Jaguar filter. Only premium gasoline used. What the hell could it be? 130,000 miles.
Anglicomarine;
I had a very similar issue that I solved in May 2013 in that I also started getting "Restricted Performance" appearing occasionally upon restart. Usually, one restart would cause everything to return to normal. After a while, it got worse and also in addition gave a transmission (Gearbox) fault notification. Lastly, a short while later, it also gave an "incorrect part fitted" notification and stayed in "Restricted Performance" (limp mode). There were no check engine lights or codes. I spent about 2 weeks tracing various circuits including the TPS. Much to my embarassment, a few days earIier had only front probed the TCM +12 volt pin. If I would have back probed it, I would have seen that there was a voltage division, which under LOAD provided insuffient voltage at the TCM. There was a poor connection pin in one of the connectors on the BOTTOM side of my under hood drivers side fuse box which was where the remaining voltage across it was hiding (the unwanted voltage division). I went ahead and (gently) pulled all those connectors from the BOTTOM and also the fuses etc. from the TOP side for a good contact cleaning. It is going on 10 years now working flawlessly. (Like I say from time to time, "It is hard to argue with success")
Whether that is your case or not, I feel that it will give you something to consider. YouTube has many videos on the merits of back probing over front probing.
Best of luck
You don't always get cel triggered by this message so no codes.
I would think there are always going to be codes when a message like "restricted performance" is listed in the message center. It may or may not be an OBDII message readable with an app like TorquePro. A more specific JLR code reader may be required. And live codes may or may not survive turning the engine off. The larger point is that reading codes should be the starting point, not throwing parts at the problem.
I would think there are always going to be codes when a message like "restricted performance" is listed in the message center. It may or may not be an OBDII message readable with an app like TorquePro. A more specific JLR code reader may be required. And live codes may or may not survive turning the engine off. The larger point is that reading codes should be the starting point, not throwing parts at the problem.
intermittent pps or tps rationality faults can set rps and not set any dtcs.
this is something you just need to figure out with experience.
No mention of the battery. Usually a waste of time (and money?) pursuing electrical type problems without a good battery in a good state of charge. Any less than 12.4 volts after being left alone overnight is an indication of trouble.
Battery and alternator are recent within 6 months.
This is when you connect a code reader and let the car tell you what it thinks is wrong. You can start with a cheap ELM327 and a mobile app.
Best of luck, keep us posted.
I have good code reader, no codes thrown. As I said, it comes on only after restarting sometimes after driven awhile. It then will clear after turning ignition on/off several times, or upon cold restart.
Hi there , don't like to say too much yet but it seems to be fixed !
i returned the sender unit to Jaguar at Yarm no problem at all - result there's your £73.27 returned to your account sir !
I fitted the new 87degree thermostat (originally 84 but only make the 87's now) £21.37 e bay .
Flushed the engine out as described in the XKR coolant flush thermostat replacement pdf - excellent read - didn't know about electrical pump also !
Took the car out on 1st journey approx 80miles over the moor's & back to home.
Water temperature on the middle line - did not waver !
So all i can say is check the cheapest & easiest things 1'st - ie your water pipes & the thermostat !
I've had the XKR about 10 yr's now been to Plymouth 3 or 4 times at least approx 800 to 1000 miles per visit , but the temp has always been at the 1'st mark above the blue, to be honest thought this ok. only had myself & my car, nothing to compare it to !
Anyway as my Dad alway's said ' if it ain't broke, don't bugger around with it ' so i haven't !
Anyway if i don't have any more Reduced Performance issuse's ..... i'll just read the how to section to see how to do the next job !!
I intend to change the engine oil this winter also the gearbox oil and the big job the blower oil ... then of course there's the 2001 seat to replace the driver's seat ( that's a 'round to it' job )!!!!
That is when i've rebuilt the engine i've taken out of the Daimler !!
ha ha ha
cheers for all your help & concern
Andy
It's on the throttle body, moved by the throttle cable. The potentiometer has double wipers and the ECU checks both to make sure they agree before moving the butterfly. This is a safety feature. If one of the two wiper tracks is damaged the signals don't agree and the ECU panics and goes int RP mode. The wiper track wears out usually around idle as that is the point of greatest wear. Had this problem on one of my XJRs year ago.
2003 XKR Intermittent Restricted Performance
