Thanks for the update. Curious what the test results will be.

Just thinking out loud, but I wonder how likely it is for a particular failure within the computer that will kill the command to all coils, not just one. Not saying it's impossible. But due to the timing (harness with known connector problem was disturbed during other work), I gotta wonder how probable it is for a brand new fault to suddenly appear within the computer.

I wonder if the loss of some input to the computer could affect the output to the coils. The CKP (Crankshaft Position) comes to mind. Don't quote me on it, but it's possible if the position of the crankshaft is unknown, the computer won't know when to fire the coils, so nothing happens. No OBD fault code is generated because the system is programmed to only tell you about emissions faults. A no-start isn't an emissions problem, so the computer just crosses its arms and stays silent. Maddening for sure, but that's the reporting logic for non-emissions problems. In other words, the computer may be fine and is responding exactly as programmed.

Maybe I'm in left field. But considering you've already found some damage to the harness, it may be worth a few minutes of time to check the CKP circuit. Maybe some corrosion took hold on the backside of that big connector, inside where the wires are crimped inside the contacts. Moving the harness may have been just enough to break a previously adequate connection.

 

Roughly 0%, I suspect.

 

I wonder if it would be best to find a scrap car, steal its ecu and part of the wiring loom with the ecu plug on it. Then get busy with a soldering iron.

 

I cannot speak for Scotland, or GB, but here "across the pond" there are firms which will test and repair ECUs... This is far better than what you appear to be suggesting above,

 

Will go into anti-theft.

Very unlikely to be the PCM (aka ECM) - get it repaired if it is.

 

Ah. I didn't know that. Thanks for the correction.

 

Yes I would try one of the PCM repair places. Now my experience with trying to repair a 2005 STR PCM was not great. First place said yes we can do it and then after I sent it to them they sent it back (repaired I guess?) but nothing had changed and I am pretty sure they did not even open it up.

Second place was even worse as the PCM plug was broken in shipping and they of course did not stand behind it. This so called repair also made no change. In the end my problem turned out to my lack of troubleshooting skills and there was actually nothing wrong with either PCM! My OEM one plus the second one I had hell finding. So I would call and talk to someone and try to see if they have had ANY experience with repairing Jaguar PCM's.

I paid in the $100-$150 range if I remember right. That was several years ago and I hope with all the potential repair work out there that these repair places have gotten better? Sorry I don't have any links to who I used.

If no spark to the coils it could be a burned out coil driver in the PCM? I have read about that type of failure but never fixed one myself.
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No spark usual cause = immo detected something.

Stores code(s).

 

Update!!!
ECU Tests ok. After further examination of the plug with hours spent removing black rubber type glue, I've found a pin with the wire corroded off. Throttle body motor. Any idea how to remove pin? Cant seem to find any information on this plug anywhere.

White clips. Pin release ?

 

You may need this:


... or something similar.

 

Good find.

Have you a pic of the front of the connector?

Yes, some have parts that move & allow access to the pins.

 

Very good job!! I would have never found that. Please keep updating so we can follow along.

Also like that pin removal set and think I will buy one for a whole $12!
But man the reviews are pretty bad about the quality of the tool.
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Great find! I've got to admire your tenacity. I think a lot of guys would have thrown in the towel a long time ago.

No idea how to repair that connector. Access must be pretty miserable. Would it be feasible to replace the harness instead, with one from a wrecking yard? I'm not sure how many branches there are coming from that plug. But if not too complicated, it might be easier than attempting a repair in very tight confines.