Hi folks,
I just bought a 1995 XJ6 and I was wondering about a few things. I am hoping somebody can help me.
1- How many different control modules does this car have.
2- Does the modules need to be programmed for this particular car or can they be swapped from other cars.
3- If they need to be programmed is it possible to do this as DIY
4- What is the best scan tool / programmer etc for these types of cars
5- Do I need a subscription or something like that to perform this type of updating/programming etc
Thanks very much

 

I’ll take a stab.

1. Four. ECU, ABS, Transmission and I assume the x300 has a body processor?

2. They can be swapped from other cars.

3. No programming possible.

4. PDU or WDS

5. Not possible.

 

Thank you so much Vee
It seems this car is easier to deal with than other cars I have had to deal with in the past.
So basically I can just find a module in the wrecking yard, install it and away we go. Thats really as sweet as it can get\.
My car is totally fine right now; but I was just being proactive incase...
Is there any common issues or problems that I should be aware of.
I like to have spare modules, relays, etc in case i get stranded, I would have a chance to recover.
hanks again for your help

 

The modules did not need to be programed until the 98 X308

Your exterior light control module between 95 then 96 through 07 could be different, and the later production version is labeled as not interchangeable so you would have to watch the VIN # change over point

The ECU swapping becomes an issue if the 2 different ECUs are " oriented " to a different TPS mounting / idle position . this is in a way a null position in the factory paper of 0.60 volts DC on the X color return wire to the ECU

There is a work around if you can;t get the ECU " oriented " with the hard-to-find Jaguar equipment

 

Hi Parker 7
I see. So the Light control module is early and late versions.
So you are saying that, its not enough to match the ECU part numbers, there still might be an issue?
Thanks

 

The later version of the exterior light control module is one in the trunk and the early 95 is 2 up front under the bonnet or hood

Yes on the ECU and takes a while to explain to get a understanding

Bed time

 

More modules in addition to ECU, Trans, ABS and BPM:

Security/Locking module, Seat control modules (2), Column/Mirror movement module, Dash lighting control module, A/C control module, and the exterior Lighting Control modules that our hero Parker refers to: one behind each headlight assembly and one in the trunk fuse box on a 1995 model.

Thats a lot. Did I forget any?

Ironically the ones you most likely might need, the ECU and the BPM, are going to be gone from any car in a parts yard. SLCMs can be found because they are hidden behind the fuel filler pipe.

The used marketplaces will sell modules occasionally, but you have to match up the suffix of the part number on the ECU and BPM for it to work right. The suffix is related to the world region the part was made for. I think -007 is for the USA if that applies. Shouldn't that be the UK suffix?

PDU and WDS hardware and software are generally impossible to find in working condition. But Autel has an OBDII scanner that is reportedly a very good one for these cars as claimed by several members in this section.

I need someone to program my BPM to keep the dome lights on for 4 minutes instead of 2. Not going to happen. Oh well.....

 

You can do the dome light delay with a external to the BPM 5 time delay holding relay

you would use the original wire to the bulb as a trigger to start the relay

Now to find a relay , alot of times I ran across 15 second relays

 

I never thought of that. Adding a longer duration bypass power feed circuit around the BPM and triggered by it should work! When the BPM shuts off its feed, the bypass would still supply power for those extra 2 minutes. I like it. Thanks P7, I will look into that.

 

Ding

RELAY TIME DELAY ON 12V 20A 5 sec | Fabian Enterprises Ltd

This is a 20 amp relay so it is large in size possibly

Connections
Pin 1 Positive supply
Pin 2 Negative supply
Pin 3 Contact common
Pin 4 Normally closed contacts
Pin 5 Normally open contacts

Function Delay ON is how it operates

Contacts change-over 5 seconds

after supply to Pins 1 & 2 Delay Time
Fixed

 

Especially for the ECU, make sure you record VIN number from the car you take it from.

Many people have reported success with the iCarsoft i930. I’ve never used it, but if you do a forum search you should find people who have reported success pulling Jaguar specific ABS and Transmission codes, that generic OBD2 readers cannot pull.

 

Something to add….

I noticed that the newer iCarsoft LR v2.0 (or 3.0) includes a feature that allegedly:

1. Electronic Throttle Control system (ETC) relearns the throttle va value while clear or
   replaces the throttle valve.

If this can, in fact, reset your TPS, that would be an extremely valuable device.

I strongly suggest that you do get an OBD2 reader that can pull Jaguar specific codes, such as the iCarsoft i930….but if there’s any way you can purchase the newer LR 2.0
or 3.0 reader from iCarsoft, that would be very informative for this forum and other fellow Jaguar owners.

I am very curious to see if this can reset the TPS for our cars. If it can, it would save you much trouble in maintaining your car!

 

Thanks for all the replies guys; i appreciate it very much.
Lots of very helpful information.
I am hearing that there is some complexity regarding the throttle position sensor TPS and there may be a reset/relearn that may be required.
Is the TPS a weak link? @Parker 7 was going to shed some light on this I think.
My goal is to have some spare parts and resources available (stored in the car) in case I run into issues?
What are the common issues that you guys have encountered that I could prepare myself for.
I am mostly interested in things that can leave me possibly stranded out there with no parts readily available!

 

There aren't a lot of parts that you will need. For the most part, the car will go into limp mode and get you home.

That being said, for the six cylinder engine:

I would carry a spare ignition coil. Could be a cheap part for this use. You would only ever use should a coil die on you.
Many people also drive around with a spark crankshaft position sensor. When this part goes, you will not be able to start your car.

That's really it. After that, you start going down a rabbit hole and you might just tow a spare car around with you.

Regarding the TPS, it's not so much that its a weak link, it just requires a reset when making adjustments, or cleaning out the throttle body and butterfly. This part seems to cause erratic problems that can't seem to be reliably traced back to the TPS itself. It bench tests just fine, but tends to cause some strange problems with the fueling of the car. Having a device to reset it would save you the hassle and cost of having a dealer or specialist do it. (You could also record the current voltage the TPS shows you at rest so you know what the car is expecting to see if/when it ever needs to be replaced. You can search the forums for those topics.

 

@Vee Hahaha
You are so right! I am over-thinking this a bit but you got to understand my daily driver has been a 1981 Mercedes 300SD and my spare car is 1984 Mercedes 300D.
Those cars does not even have an electric fuel pump. I feel so confidant driving them because I can almost repair everything.
I love your advice though. A crank angle sensor, an ignition coil, a fuel pump relay are good things to have.
I bought this car because I was smitten by the styling, the gorgeous glacier white color, the fact that it only has 60K miles but now that I have owned it a while,
to be perfectly honest it feels a bit fragile.
The other day I felt it missing briefly when I pulled to stop light and I started worry she was going to die on me.
I had to replace the upper rear shock bushings because they had completely disintegrated.
And I hear something like a timing chain/rods on cold starts. (It has updated the upper chain tensioner)
There was an intermittent rattle from the back it ended up being the speaker required the back seat to come out
Now I have started smelling raw fuel and I see that the sending unit gasket is seeping.
This car has had a very easy life, cared for and garaged but I feel like I am waiting for it to fall apart.

 

Raw fuel? Ugh. That might be the tank. I just had mine resealed. Do you ever hear a loud bang after you park the car and turn it off?

Have you checked your Rochester Valve lately?

It could also be your oxygen sensors. If you've never replaced them, now would be a good time.

Lastly, you might want to check your fuel regulator. There's a small hose that pulls a vacuum. It its wet, or smells of fuel, you'll want to replace that.

You'll find that most everything on your car can be fixed by yourself as well. Jaguar was just getting started on OBD2 and computer modules. It the diagnosing that can kill you!

 

I think you might be right. It must be the tank. The trunk smells like gas not under the hood.
Where is this Rochester valve. On the tank? This tank looks like a pain in the *** to remove.
I dont know about the oxygen sensors. Perhaps I'll replace them.
Yeah I mean I can see that I can perform a lot of the mechanical stuff but the electronics is what worries me more.

 

There are different PROMs in the ECMs according to model and year.

I had a POOR RUNNING XJR when I worked at the dealer. Customer bought the car from an auction and it ran like $H!T.

Several diagnostic attempts and I FINALLY figured out the someone had installed a Normally Aspirated ECM in the SuperCharged car.

I forget if I replaced the ECM with a salvage yard part or simply replaced the PROMs. (several decades ago so I don't remember)

Recall from years ago list the different PROMs.(I did dozens and dozens)

The AJ16 installed in the XJ-S was subject to the same recall.

 

The ECU TSB that Bob mentions if done will have a sticker on it as R - 493 and also as a sticker by the radiator

Late model 97 X300s may not have this sticker as the TSB may have been accomplished in the factory

The EPROM numbers ( 2 EPROMs per ECU ) inside will tell the difference

The early year EGR valve part # should work fine with a early or non TSB complied ECU , simply a pollution compliance that Bob would know better about

 

Here is what I found on the car.