By the way of trial
have a look at the Inertia Switch.

 

A fast test for correct communication between BPM and SLM is to open the fuel filler flap, if it works (releases) communication bus should be ok.

 

Thanks Toaster, it does indeed work just fine, filler flap opens perfectly. Apart from lack of fuel/spark, there is nothing else on the car that doesn't work - except one LED in the instrument cluster (the green one for headlights).

By way of update, I pulled the instrument cluster (hoping to see something obvious like failed solder or capacitor) but it is visually fine.

Just waiting on a replacement '97 version of the KTM to arrive (ETA Saturday). If that doesn't work, I am going to check the BPM (visually) but I still have my doubts about the BPM as it is mostly concerned with cranking (which my cars fine) and not so much fuel and spark (which is failing on mine).

 

Inertia Switch????

 

Unfortunately the inertia switch is okay - and it enables a huge number of circuits (which are all fine) and cuts the starter motor relay from working (which would stop cranking from happening). I think the inertia switch created P-codes as well.

If only it was something that easy-to-get-to

 

Did you resolve this?

 

No, it turns out that that's a logic signal from the BPM - so it may be okay for that split second that the KTM is lit up to read the transponder within the key (which it does just fine). The fact that the car cranks is important. If it failed to crank then the problems would be much more obvious. Electrical guide says the following.

All of the crank parameters are checking out okay, it's whatever is supposed to set the injector and coil parameters - that initial startup phase is missing. Don't know if that's BPM or ECM, it sounds like ECM.

Anyway, I will try the replacement KTM at the weekend because it's an easy thing to try.

 

If there where a problem with the Key/Transponder/KTM and no validation of the key, the ECM would not engage the starter.......

Maybe it is something like in this thread: https://www.jaguarforums.com/forum/x...k-71752/page5/

 

It is also quite odd that the car isn't showing P1000/P1643 after a hard reset.
Although it does throw P-codes whenever the IAT/AFM is disconnected.

 

Did you get this resolved?

 

Not yet - I have a replacement ECM coming this week, but will have to wait for the snow to stop here before pushing the car outside (the cylinders have oil in them from compression testing so if it does happen to be resolved, it needs to be done outdoors!) so I doubt I will have news until the weekend.

The ECM was a cheap and easy thing to replace, and doesn't need coded as it's coming with a matching KTM and transponder key. So if this doesn't solve it, it's off to the experts. I don't have software to code in a replacement BPM, in case that it the issue as mentioned by a few here.

 

Just a possible suggestion...

I had this same problem a couple of years back - I drove my XK8 to the pub for lunch with no problems at all. Got back in an hour later turned the key and continuous cranking with no sign of any fuel. Also accompanied by an engine fault message on the dash.

After weeks of research and trials I happened to be sat cranking over and noticed that the gear shifter had not fully located into the P position. This was only apparent by the absence of the illuminated P.

I gave the shifter a wiggle, the P illuminated and hey presto she fired straight up!


So worth a check!

Good luck

 

The Auto Enginuity code description differs from the Jaguar one:
https://www.jaguarforums.com/forum/a..._2003range.pdf

The ignition switch is really ok?

B1595 is weird.

 

Yeah - I took the back off the ignition switch and measured what happens when the key turns, all okay. And the wiring looked fine, no damage. I checked upstream of the ignition key and various items were getting signals from the ignition mech.

I know that people have had problems with the gearstick/shift with B1595, but mine checks out fine as far as LEDs go, and some live data from Autoenginuity. Also, it cranks but doesn't fire in neutral just as it cranks/no fire in Park

 

Can you move the gear selector without a key in the ignition switch?

Work the "Entry/Exit Mode - Steering Column Tilt Away" when you remove the key from the ignition switch?

 

No, it does that beeping thing if you move the stick unless the ignition is on (think it is position 2) and only with the footbrake pressed. You can hear the solenoid click too

 

Steering column?

Sorry for questions, if the ignition switch is absolutely ok,
all points to the BPM, all DTC´s are BPM related......

 

All ideas welcome

I took a look under the column, everything is tight and buttoned up. Ran a few continuity tests and all were fine.

I am hoping it's not the BPM as that's one thing I can't fix (needs coded) so am getting everything else out of the way. BPM is last resort. It looked okay from what I could see, and its connections were tight and clean.

This weekend will tell (replacement ECM arrives)

 

The "Entry/Exit Mode - Steering Column Tilt Away" works?

If "yes" and you can lock the car with Key-FOB the ignition switch seems to be ok,
-no other chance- you need someone with WDS.

 

I have that disabled, but the column returns to a parked position whenever the battery is reconnected - I know this because I have to extend the column in order to take the cowlings off the steering wheel/ignition.

Fob works perfectly, locks and unlocks, alarm chirps as normal, deadlocking also works.

Fingers crossed for ECM still but I get the point about WDS (and BPM) !