Hello
Two mechanics intervened before us the starter does not work but problem solved by changing a diode on the relay
currently the white wire in the trunk is not powered if I turn on the ignition I found part of the diagram on the forum I am attaching it the w cable to the 250 is not powered
have a good day

 

It would help if we knew what year your XJS is, and what engine it has.

 

XJ-S from 1977 V12

 

On your diagram 250 is the fuel inertia cutoff switch. Take at look at it and see if it is in the "off" position.
Where are you in France?

 

In Bordeaux

 

where is this inertia switch located on the car?

 

I think you will find it on the door pillar between the hinges.

 

cote volant a gauche?

 

steering wheel side on the left?

 

Oui, mais si non, regardez au droit!

 

Bonjour vignerons33

The Fuel Cut off switch is located in a plastic box normally on the left hand side of the Car no matter what side the steering wheel is on there is a hole in the top of the box with a button that you push to reset it as Greg says by the door jamb in front of the hinges

L'interrupteur de coupure de carburant est situé dans une boîte en plastique normalement sur le côté gauche de la voiture, quel que soit le côté du volant, il y a un trou dans le haut de la boîte avec un bouton que vous appuyez pour le réinitialiser comme Greg dit par le chambranle de la porte devant les gonds

 

I think you pull it up to to set it OB ?

 

Hi Greg

You got me doubting myself now!

Its either one or the other so shouldn't be too hard to figure out

 

Hello Greg and hello Orange Blossom I thank you for your information and I will keep you informed on the rest because now I have to explain this to my mechanic friend
Very good day to you all

 

OK, at great exoense to management, I



OK, at great expense to management I looked both my spares.

DOWN IS ON.






i

 

Hello everyone it was indeed the inertia switch that was off but now we think that the ecu has a problem so we will have it repaired I post you a photo of the ecu where there is a wheel does it affect the proper functioning Very good da

 

That is the "tamper proof" cover for the HOT idle mixture fine tune.

It is to prevent you and me fiddling with factory settings, HAHA, nice try.

Some markets, I am led to believe, it is illegal to tamper with that thing, not down here.

Read the attachment, it may be that simple.

I say it once more:

Simple cars these V12's, only made complicated by overthinking issues.

 

hank you for the information
Very good day

 

MY BAD
Just caught up with myself.

Yours is a PreHE, so D Jetronoc EFI system.

That "wheel" is a plastic "wheel", NOT A TAMPER PROOF PLUG. It is like an old style radio knob, and actually is designed to rotate that potentiometer inside the ECU.

NO NEED for any tools of sort.

What are issues you are now having, it may be teh MAF sensor in the engine bay.

 

Hello everyone
My concern is that relay 16 is well powered but relay 17 is not powered
As far as the wheel is concerned, it's just out of curiosity but we think that the ecu must have suffered following the previous intervention
I have just learned that one of the two speakers works at jaguard, I wonder he did not even think of the inertia switch, so I deduce that he must have been a sweeper rather than a mechanic!
Good day to you