I shorted out a wire in the ignition system, It will turn over but not start. Im thinking maybe it's the Crankshaft Position Sensor, but I took a diagnostic scan ands it shows everything is good.. I would think it would throw a code if it were the Crank Sensor..Thanks for any help...

 

Maaaaaate.

We will need to know the year of the beast, the engine, whether an AJ6 or an AJ16.

CAS has me assuming an AJ16?????.

 

Its an AJ16...

 

Thank you for that clarification.

The CAS probably has not had time to throw a code. My X300 AJ16 drove home, stopped, went to restart an hour later, nope. NO codes, nothing.

Since it was at that 160K magical number, the CAS was 1st suspect. Borrowed one from next door, all sweet.

Which wire did you short??

I dont have a schematics for the XJ-S with the AJ16, but the X300 has a number of Ignition fuses, and relays, maybe one of them has popped.

If you have a volt meter, probe the Red wire of the CAS, with Ign ON, it should have 12v. That will eliminate some of the fuses etc.

 

there are 2 relays in front of the blower box on the right side of the car. I was putting in one of the relays and touched a hot wire and then I couldn't start the engine, turns over, not showing anything on the tach when I try to start the engine.

 

Im sorry I don't know what CAS means, im a novice at this. Thanks

 

CAS = Crank Angle Sensor.

Fitted on the front RH side of the engine. Has a short 2 wire loom to a vertical connector plug at the front of the block.

Someone with a schematics should be able to sort those relays, and what fuses you may have blown.

 

crankshaft position sensor...? That is really difficult to get to, can't even see it because of the hood in the way and radiator so close to the front of the engine...thanks all try..

 

I can't find it at all..

 

OK,

Bonnet open
Lean over the RH side,look at the front corner of the engine.
There is a metal (tin) lid with a window in it facing you. That is the CAM angle sensor.
Down the front of that, and SLIGHTLY towards the centre of the engine timing cover is a vertical loom connector.
Follow the wires DOWN from that connector, and you will reach the CAS.
It is mounted on a bracket that is bolted to the timing cover. MEMORY????? 8mm spanner size.

That vertical connector is a problem in that the openings of it are vertical, and rubbish/oil etc falls in there, and the terminals loose their integrity, dead engine.

I have an R here at the moment, and I will see if I can get some snaps. not much room under that sucker. I will be back.

 

I really think it's a Fuse or Relay, because when I shorted the wire out there was a real loud snap...close by.

 

I agree.

I dont have a wiring schematics for the XJS of that year/engine. Maybe its in the stickies at the top.

The fuse locations, and what they control, is always in the owners handbook.

The X300 MIGHT be the same, but I doubt it.

 

That sounds to me to be something other than a fuse burning out. Fuses go quietly.

"SNAP!" sounds more like something taking too much current and expanding until something gives.

An appropriate wiring schematic helps find the wires ends quickly. Same process regardless...

Do you have power to a component where you should?
If no, trace wiring back towards the source.
Do you have power at the other end?
And repeat...

e.g.I shorted the thermoswitch leads on my 5.3 and killed something. Every in-line and boxed fuse checked out. Cleaned all joins and holders and still nothing. Apparently the copper traces on the board inside the Diode pack (looks like a relay in the efan circuit ) are rated at less current than the fuses! I would never have found this break without metering the circuit at each junction. Power went in, but did not come out of the diode pack.

 

I don't have a owners manual or repair service manual on this car yet. I can see it's going to be a pain in the butt alright..

 

This probably what you are looking for.

https://www.jaguarforums.com/forum/x...ams-faq-34887/

Found it in the top section of the XJS section, under the "How to quick links".

Scroll down few, and you will come to "forcedair1", who has a 5.9mb wiring diagram that should fit.

Send him a PM with your private email address, and he will send it to you.

 

I have no Idea how to troubleshoot this problem, have no Idea where to start..

 

I found the problem it was NOT the Crankshaft Position Sensor either, it was in fact a FUSE as I suspected all along.