Andy wrote: > That's the engine in my XF - about a year ago the EMS took leave of > its senses and started killing the engine dead whilst I was driving > (with spurious errors displayed on the dash). Then, at one point, > whist I was sitting at the roadside (having coasted to a halt safely, > fortunately) looking at the manual to try to decipher the dashboard > warnings the engine started again all by itself... :-/ > > According to Jaguar it was caused by a faulty parking brake sensor - > well, if something like that can cause such potentially catastrophic > consequences for the EMS as a whole the software must be so bad that > I'm not surprised you bailed out... >
That is indeed a very worrying happening and shouldn't have cut the engine or started it up again without your intervention (Can you remember if you had your foot on the footbrake at the time of the restart?). The normal fault reaction is, at worst, to put you into limp home to allow you to drive slowly to a place of safety (or home if suitable). Unless you've got a more modern type of eco stop-start (which I don't remember having been launched on the XF, but I may be wrong) I can't see why the engine would restart itself. I also struggle to understand why a faulty park brake sensor would cut the engine unless they've programmed the engine to cut if someone applies the handbrake (electrical actuation I presume?) during forward motion. I'm still in contact with some of my colleagues at Jags so, if the problem is still present, I could ask their advice/comments on your behalf. Unfortunately the team that I used to lead will have disbanded and moved onto other projects now so I have no direct line of enquiry. Roger
