Hi. I have a 1992 xjrs 6.0 RHD UK car)which I run only occasionally (pity). Ever since I bought it 13 years ago this wire has been tied up to a strut. Doesn't seem to be important but I always wonder if it would run better if i could find a home for the loose end. Any ideas?
Its blue and joins into what I believe is the fuel injection loom. The car is
unmodified.

 

I don't know what the wires does, sorry.

But unused wires, connectors, relay sockets, and the like are not anything to be concerned about as a rule. Jaguar built cars with different equipment for different markets; some cars may have xxx-widget while others don't.....thus unused wires, sockets, etc

Cheers
DD

 

Is it a plug? Can well be the 91 or 95 ron switch plug...

 

Thanks for the replies.
I thought I had attached a photo but I dont see it here.
Ill try again
The whitr arrow is the splice into the (i think) fuel injection loom. The end of the wire is stripped as if it has at one time been attached to something.

 

Hi Daim
Thanks for your reply. However I dont know what is a "ron switch plug". By the way does my photo allow you to confirm what you thought?

 

l think the fuel jumper plug is on the other side of the motor but if your car is a 6 litre XJRS it will be zytek engine management and may well not have the jumper at all.

 

Baxtor
I much appreciate your reply.
Note this is a RHD UK car so all is opposite. It has Zytek indeed.
I would like to add that the yellow connector has only ever had one (blue) wire in and one blue out because the other two terminals are blanked off. I think that the other end should be connected to something ... but what?

 

Yes I did notice RHD, as is mine and why I was aware of jumper plug position. Can you identify the wire colour to which it is spliced?

 

Spliced is perhaps not quite the right term now that I have stripped the tape off the loom sheathing. The blue wire continues the same blue through the "splice" without interruption and on into the large connector you see just below the word "splice" in my photo. It continues through this connector, joins the injection loom enclosed in the injection loom heading towards the bulkhead. It remains the same blue all the time. I would have to do much more loom sheathing stripping to be sure of where it went afterwards. I would like to avoid it as much as possible.

Sam

 

There is only one blue wire from Zytek ECU. It is for purge valve.

https://www.jaguarforums.com/forum/x...roblem-174138/
There is circuit diagram. #9
Special thanks to Greg!

 

Three or more guesses or points from afar.


1. I was going to suggest identifying the color of the wire that the blue was spliced in to. And that the identity of the former might be a clue as to the purpose of the blue. Too late, as it was a red herring, best.


2. Track down a schematic for your car. See what you can fid for a blue wire.


3. Purge might be a great place to check out. An emission thing to dispose of gas tank vapor. Removed as in needed in your place of residence?


4. My "different" car also has such a wire. Not a mystery to me, as I installed it. But, if it leaves here, not intended, it's new steward might post here seeking help.


Mine is an emergency "crank" wire. One end attached to the starter solenoid. The other open for touching to battery +.


Carl

 

The investigation continues.
As you have said I need to trace the wire. So far I have traced it back to a connector in the passenger footwell area (LHS for my UK car) where the colour changes from blue to grey (or slate I think they call it in the workshop manual) with pink collars every few inches. Then it disappears again. To be followed-up as soon as I have some time.
Thanks again for your encouragement.