Hi all

i have a 54 plate s type 2.7 diesel. Everything has been fine until last week when I was driving home. Engine was at temp as normal when I went to accelerate no power. Looked down at dash and I had performance restricted
problem being there were no warning lights on anywhere just the message

turn it off and back on it was fine. 8 later exactly the same thing

car had major service and cam belt 4!weeks ago by a local jaguar master tech

no faults on them cars on board diagnostics and I can't get me obd2 reader to talk to the car

any ideas

thamks
paul

 

Which obdII device are you using because I have had problems with an elm327 version 2, it worked on some cars but not on others.
So just see if you can get another score reader and try that.

 

Well just plugged in with elm and my laptop connected fine. But guess what. No
error codes of any description. Think this is gonna be a weird one

thanks

 

I would start by looking at the battery, it has to be 12.6 volts. then I would go to the fuel trims


They might show you if something is not right, The long term fuel trims have to be around+ or - 20% from the 0 line to set a code so if it different from that it may show that you have a problem

 

are they checked while
runnimg
or
om a journey with laptop plugged in

thanks

paul

 

You have to start the engine. The short term will fluctuate that is normal, it's the long term that are of interest

 

whats the best software for this

 

Hi,
I use this program http://www.outilsobdfacile.com/software-eobd-facile-elm327.php
Test version.
I set it up to use the graphs in additional features.
then I use the short-term bank 1 ((lambda sensor) long-term 02 sensor bank 1

I also set it up to read the bank 2 at the same time.

watch this video and it help you understand what you are looking at.
https://youtu.be/5WnM_NsOtd8