Hello Everyone,

Short version:: Jaguar rebuild project, need help with DTCs, parts to replace. Mainly with P0256-13 - for now.

Long Version:
First of all - apologies if some of this information is already out there in the forums, I did my best to search and honestly I am a bit tired from spinning my brain around and hitting dead ends etc. A quick summary of the road that I have taken to own an XJ:

Around a year ago I bought a wrecked MY2013 Jaguar XJ L Supercharged - 5l version. The previous owner that tried to rebuild it gave up. At the time of purchase, the car would start and run for a second or two and would cut out. For those few seconds engine would run great, hence why I took the risk. Additionally, there was cooling system parts to install and repair and it had some weld jobs to do and a lot more.

Reason for not running was a lot of gunk and other type of trash in the fuel system. There was sand in the fuel injectors and pretty much in all of the fuel system. Replaced/flushed fuel system, got new injectors in and car started running. Also, replaced the fuel rail pressure sensor next to the high pressure fuel rail. Basically fuel system needed to be fixed for it to even run. Lets skip past the long list of other repairs done and go to the summary of the main issues that need adressing for now.

There are 4 main issues with it now:

• Car drives, but has no power - like its in limp mode or something, but no "RESTRICTED PERFORMANCE" like I've seen in my XF at times - this is the one I'd like to focus on the most for now
• Issues with chassis - rear suspension doesn't level itself without "Height calibration" via SDD.
• No cruise control with adaptive distance - for this, I am looking on how to opt out of fixing this just have regular cruise control by disabling ACC
• E-Diff Not available -- currently using CCF I set it to not fitted so it doesn't throw faults
• Dynamic mode not available

Here is the latest DTCs list. The car drives, shifts, is able to reach 60mph and above, but slowly. There is really very minimal power. If I press the gas pedal feels like the car suffocates and fuel or air cuts out. I checked the trim values - Bank 1 was displaying 16% and Bank 2 had no data available - no readings.

I have a suspicion, that the above trim issues and general power issues are due to the P0256-13 PCM ------km Injection pump fuel metering control B DTC.

I tried reading wiring diagrams and manuals to understand where and what this part is (I thought its the high pressure fuel sensor next to the high pressure fuel rails.). For that sensor, the voltage is reading 0.00V or 0.01V (via SDD datalogger)- but I am able to see the fuel pressure go to like 1.5k - 2k PSI on idle revs. I did a comparison to my 2011 5.0 N.A XF and I sort of understand how the values should look like. Anyways...Where is this part? Does anyone have any idea where the sensor is? I'm trying to tackle this step by step by fixing power first then going on to chassis or the other issues.

In any case - any assistance or information with regards to ANY of the aforementioned issues/DTCs is greatly appreciated. The car is a rollercoaster when it comes to fixing all the issues that came with it e.g. the rear parking sensors were disconnected, therefore the main dash was not displaying half of the screen lol.

I just got the car back from the paint job. I would be gladly posting the salvage pictures and the end result. I think you'd like the color I picked.

I have acquired a myriad of knowledge on this car and once the issues are resolved I can do a writeup of all the stuff that went into getting this done, I'm sure some enthusiasts would be having a good time reading it. This is one hell of a story.

Thank you, take care!

 

First I think we might have some miss communication?
That code is for a Diesel engine and you mention yours is a 5.0L SC which is a gas engine?
So you can't find that sensor because it does not exist on your version XJ?

You did not post but were all 3 fuel pumps replaced?
The mention of sand is worrisome and I wonder if there is still some contamination in the fuel system?

Your huge list of codes points to extensive wire harness damage. All those network U errors especially.
There is just too much wrong for me to say where to even start?
How much wiring have you fixed/replaced?

Is the battery new?
Have you been clearing the codes and starting over? From what you post it looks like you are using SDD which is I think mandatory with a project like this.
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Thanks for the reply!

First off, I was baffled by your response that that DTC is for Diesel engines only. It's not a diesel, its the 5l SC version. I have no idea why that DTC is on there. When I picked up the car it was clear that the previous owner was trying to rebuild it but gave up so.. I don't know, maybe he stuck an incorrect control module or something in there from a Diesel - that is my best guess. I remember running the module network test and it came back fine.

As for the pumps - the one in the tank works good - it was tested and is pumping. For the high pressure ones - those were taken out as part of the system clean and have been cleaned. The did not look damaged and the pressure readings didn't indicate any issue. But now, given the situation with this Diesel code I am suspecting that maybe one of the pumps is faulty, hence why Bank 2 is not showing any data for fuel trims... Since the budget already nearing triple for this, I can't blindly replace the parts - my plan is to take out the pumps from my 2011 5l N/A and put them into the XJ as a test. They should be the same. As far as the contaminates are concerned - the system was flushed and tested, tank was cleaned out and dried out and again cleaned out. Everything was done before the new injectors went in. Isn't there a low pressure fuel sensor and a high pressure fuel sensor? The one close to the fuel rails and the 2 pumps has been replaced. The other one, if it exists even, has not. That is what I was suspecting was the issue.

Regarding wiring harness - beyond the MAF sensor wiring I did not need to repair any harnesses, they were repaired by the prior owner or were not damaged at all. We took the car to an electrician - he tested all the engine related wiring - looked OK. If there was a wiring issue I'd see a DTC for that probably, right?

I've been clearing the codes, battery is new and was fully charged. Although it was drained once during the painting of the car it looks like - but he charged it back to full.

These problems that are left now are actually the finish line - the car did not even run as mentioned for more than a second. Cooling system needed lots of work, somehow, just somehow, the SC did not have ANY OIL in it! So that had to be taken care of... The car is a mystery as to what the previous owner(s) did to it in terms of damage and repairs. But it runs now - 3 shops including a local JLR shop were not able to start it lol, so we had to take it upon ourselves to do it.

I will keep people updated here as to any changes happening. Next step is it is going for a transmission oil change after that its back to the garage to swap the fuel pumps to test it. Hopefully this is the issue, and Bank2 fuel trim data will be displayed. Should be done early next week I assume.

I think we will find the culprit for the power loss as its mostly mechanical probably. I am more worried if I will be able to disable ACC and just have regular cruise control. But that is a story for another day.

 

Thanks for the reply!
Yes I was confused because the error seems to be only for Diesel engines and you did post you have the 5.0L. So I can't figure out how that code would even be triggered?
You just have so many U codes which are network related. I don't know how there could be that many without some kind of wiring harness issues?

The fuel pressure is a good idea but the car will set a number of codes for fuel pressure problems and I did not see any in you long posted list of codes?

Are the number of codes decreasing as you work on the car and keep checking and clearing the codes? If so that is progress!

Good luck as this is a tough one! I will be watching and hopefully you can report back with a successful repair!
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