Hi, I am looking to get a ECU for my X300 3.2 auto as mine has recently failed due to water ingress and i'm hoping someone could confirm something. I was told by the mechanic who found the problem that the ECU required for my model and year is "plug and drive" and should not need coding. Therefore I browsed but was unable to locate one with a part number that matched exactly the numbers on mine. I called the Jag mechanic who said to his knowledge he didnt think it mattered if it wasn't so different in the way of being manual and not auto, etc. I've now managed to find one and the part numbers are as follows.. LNA141O(BE)/211 with the one i'm thinking on getting being LNA1410(BF)/211 (Basically BE and BF being the only difference). From what I can find these letters represent superseeding changes and shouldn't matter to running, etc. Can anyone confirm please?
Thanks in anticipation. CJ

 

The engine ECUs underwent "end-of-line" programming using the Jaguar PECUS system. This included selection the appropriate settings for either a manual or auto vehicle as the ECU contains the software to run both. It is therefore important to to ensure that any used ECU comes from a vehicle with the same type of transmission. As I understand it you plan to repalce your old ECU LNA1410BE/211 with a repalcement ECU LNA1410BF/211. The fact that the replacement ECU has a PECUS suffix /211 means that it must also be from a 3.2L auto car. The part number suffixes such as BE and BF can indicate significant differences such as 3.2L, 4.0L or 4.0L SC engines or just differences in the software level running in the ECU.

 

He is right, if you are looking for a "Plug and Play" solution, it's imperative that you get an exact match ECU due to compatibility.

Also, your local Jaguar mechanic might need to do a quick adaptation with his Jaguar Scanner of the ECU to your car. Sometimes this is necessary to avoid CELs or running on limp mode problems.

However, if you cannot find an exact matched numbered ECU for your car, and you want a plug and play solution to avoid higher costs, "cloning" your original ECU's memory onto a donor is the only way to go.

 

I believe I need to replace the ecu. I ordered one online a couple of days ago. It is from a 97 xj6. The part number for this is LNA1410 AL / LNA1410 AH. The ecu that is presently in the car has LNB1410 AD / LNB1410 AE.
Will I be able to do a direct replacement of these? Any help is appreciated.

 

The 3 digit number after the "slash" on the PECUS label need to be the same on the replacement ECU as the one that is being replaced.

 

Thank you. The part that I am buying has 102 after the slash on the PECUS label. The part that is in my car now does not appear to have a pecus label - at least it is not on the same side as the other labels. I have not yet removed it. Is there any other way to find out if it is the same?

 

It may be possible to read this info with certain serrvice diagnostic tools, but maynbe only ones that a dealer or good independent Jaguar specialist would have available. If you take the ECU out you may find the PECUS label is just stuck on the other side. You are going to have to take it out if you are going to change it anyway.

I'm a bit confused. If you have't already removed the ECU, how do you know the connectors are damaged by water ingress?

 

The water ingress issue was from another poster. My issue was that it was running too rich(failed smog). I replaced all 4 o2 sensors and the obd codes for o2s came back on. Apparently if this happens the problem is the PCM, therefore I am replacing it. I took it out last night. It did not have any other stickers on it. The replacement PCM is coming from a 97 xj6 4.0 automatic which is what I have. Even if I cannot confirm that the numbers of the replacement are the same as mine, can I do any harm by trying it anyway?

 

If the ECU is in good condition to begin with, there is no harm in trying.

If the ECU isn't perfect for the car, it will run rich or lean, but it won't damage anything.

 

I too had problems with my ECU getting wet. My car is a 1995 XJ6 with 220K miles.

I sent the unit to a place in Texas called ECM Depot. They redid it for $750. Can't remember if it is warranted for life but I think it is. Anyway, all is well now.

By the way, the Jag dealer price for a new ECM was $4200.

bliving7

 

I am attempt to not spend $750 to repair a wet ECU - how do we prevent water ingress in the first place??

 

$750? Ouch!

 

In my case it was a poorly installed replacement windscreen. After I got the ECU fixed I replaced the replacement windscreen and have been trouble free since.

bliving7