I finally got a Mongoose cable and setup SDD.

It isnt proving very helpful as all the obvious modules are not responding;

I find it a bit weird that IP, TCM, ABS, etc modules response to my iCarsoft, but not to SDD!

Any pointers please?

 

What are the icons doing in the upper right side of the screen we can't see? What version are you running as that is also cut off?
Don't do anything if the battery one is NOT green. Do you have a proper DC power supply hooked up to the car and NOT a battery charger?

Here is my car;





It also seems strange you don't have very many modules listed compared to my 2014 XJ? But that maybe just due to different cars?

I think NBCat and Karl are pointing to the possible problem? Have you done any wiring checks as suggested?
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Battery is green. I just have a battery charger. My understanding is voltage is only a major issue when reprogramming modules - I really dont want to be buying more kit as I suspect this car is going to be broken for parts.

 

Just found this (http://jagrepair.com/images/Electrical/XFWorkshopManual/Electronic Feature Group.pdf) on the XF while searching for code 24;



Check that the High Speed CAN network is not malfunctioning, i.e. the CAN circuit is open or short circuit. This would mean that the instrument cluster and ECM would be unable to communicate resulting in no Challenge being performed to enable the ECM. This would be supported by LED Flash Code 24, see PATS Fault Code Table.



After the instrument cluster has transmitted its first PATS idle message, it will start a 2 second timer running. If the PATS sequence does not complete (Cluster received the Enable msg) within this time period the instrument cluster will set this DTC - Idle message missing - code 24 flashing 10 times



, which corresponds to what I had assumed - can bus problems means the IC cannot talk to the ECM.

 

Lots of CAN errors. SDD can't see modules which are on CAN.

Maybe check out the CAN!! I mean, how many more things have to point to CAN???

 

Hey great find! I finally see code 24 for PATS!
I do see there are also numerous "B" codes associated with any PATS code so I think SDD would give a more complete answer.

But that PATS 24 code is a rare and unknown code for sure!
They don't give us much to go on for the repair?

"In all cases of suspected non-start issues, the most logical failure modes should be eliminated first. i.e.
1. Check all relevant supplies and grounds to the relevant modules listed herein.
2. Note any unusual behavior from other systems/functionality.
3. Note any functions that are not operating as expected."

Pretty skimpy!
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I've performed the CAN resistance test, which passes (60 ohms).

I've checked the front wiring harness as best I can, could not see any broken wires.

I am thinking it is time to either get an Auto Electrician to come have a look, or get it collected and taken to a reputable garage. The problem is 'reputable' - all the Jaguar Specialists near me (Andover, Hampshire, UK) are very expensive, and I am worried it will cost more than the car is worth to repair.

 

Imagine something is wrongly transmitting, the ohms would be OK but the packets could be garbage. Ideally look with a CAN bus analyser but not exactly an everyday tool.