Hi there !

First failure with my cat !

First , my vehicle :

XJ8 (308) / 2001 / 3,2 /AJ27 engine (Vin SAJAA13L71KF34989) - 150 000kms

Yesterday, I stay stucked at the parking with my XJ refusing to start!

- First, engine fire but not enough revolutions to make it running properly / engine stopped 2/3 sec after cranking

- After some cranking trials, the engine did not start at all

- Battery is fully charged (checked/ new battery)

- Got warning message on the panel board such as " electrical default " / " suspension default / transmission default ;

As i've got an OBD II, I checked for the error codes.

These are :

-P1230 (Could be a fuel pump relay failure /or fuel pump relay / or an engine module failure - ?? )

-P 1000 (System checks not complete since last memory clear)

When turning the key to ignition (without cranking engine/just giving electric energy), I dont have the same sequence of lights going on/off on the panel board : usually the sequence end with the airbag checking system ; no more now (only turned signal lights up + beam headlights then all this lights turns off)


Anything more to check other than the fuel system (pump relay/ fuel pump ) ?

The suspension default message is strange as I do not have the CAT system on my XJ8 !


I believe that du to the age of the car it should be an asset to start renewing electrical devices such as relays/module(s) ?


Best regards to all

Thierry (=> apologizing if my english isn't fully understandable / if so , tell me & I'll try to correct it my best )

 

Your english is better than many americans posting here. Fuel pump failure is likely. Locate the schrader valve on the fuel rail, it looks just like a tire valve and has a plastic cap. Turn the ignition on and depress the valve stem. You should have a healthy spurt of fuel as the pressure is 40 psi.

It's more likely that the pump has failed than the relay if you have little or no pressure. Also, it' would be very expensive to start replacing modules and relays, and not particularly useful.

Code 1000 means ECU has not completed system checks, will change to P1111.
Don't worry about the others, although it could be an indication of poor power and ground connections.

 

I would recommend you check all battery connections, grounds, the + bulkhead connector, and voltage at the starter based on your saying the battery is new.


" electrical default " / " suspension default / transmission default messages together often point to voltage problems

 

Thank you all for your answers & advices ;

@RJ237 : yes, fuel pressure test will give fast response to the fuel pump efficiency ;

@Rocklandjag: Thank you; didn't think about these recommendations !




The Cat is now at the garage , specialized in electronics/electricity ; I gave them a copy of the workshop manual (USB key).

I have to expect next week for some more news about the failure(s) !

So, have a nice week end and "rendez-vous" next week for sharing infos with you all !

Best regards

Thierry

 

The symptom where it almost runs for a second or two, is exactly what happened when my fuel pumps failed. I guess there's enough fuel drawn in without the fuel pump running (maybe by suction?) to make it seem like the engine is almost going to run.

 

Hello gentlemens !

Here are some news about the car :

According to the electrician who is working on my XJ8

-Fuel pump relay is ok
- The fuel pump is ok

Engine as been cranked , started & ran ok after making a bypass (Im a complete ignorant with electrics systems o I can't explain precisely what he did & where...)

This 1st step confirm the electric trouble(s) is not coming from the fuel relay, nor the fuel pump !

Netherveless there is a problem as the dashboard lights sequence has changed , not ending with the airbag light coming on/off as usual ;

I have downloaded the XJ8 2001 electrical guide here on the forum ; I'll report again RocklandJag advices to the garage:

" would recommend you check all battery connections, grounds, the + bulkhead connector, and voltage at the starter based on your saying the battery is new."

 

Hi gentlemens !

Some news about this electrical trouble ! ...

A s I told in my previous post , it is confirmed that the fuel pump relay nor the fuel pump has any default ; the problem has been found in the fuse box (engine bay) and is coming from a deficient soldering dot (not sure if this is the correct name) on the electronic card where the fuses & relays are displayed !

The electrician will try to repair this card in order to make the XJ purring again... On my side I will order a new one as it can be delivered on special order at SNG Barratt .

The reference is LNF 2822 BA and price is around 237 euros (Approx 267 us $ ) for a new part !

Could someone confirm that this reference is also the same one than the trunk fuse box or is it different ??

I'm thinking about the fuseboxes replacement...

Thank you for reading and enjoy your Jag !

Thierry

 

Seem that LNF 2822 BA is for the engine fusebox and LNF 2822 AB for the one in the trunk !

 

Back with some news about my car and the electronic trouble !

The fusebox changed didn't solve the problem ; according to the electrician who have been working on my Jag , the problem would be in relation with the Body Processor module (the one behind the gloves box) !

Could this module in failure induce a "non starting engine" / errors defaults ???

According to the VCATS sticker placed inside the trunk, BPM serial is LNG2500AB/044 ;

That mean if I replace it with a new one without re-programing , the serial should be ending the same ? (AB/044) ?

or a AB/XX should be re-programed in order to fit the car ?

==> No Jag dealer close to my home !

 

The BPM or Body Processor Module does have any effect on the Engine Management System. It does what it says controls Body functions. In general lights for the interior and exterior, door locks, trunk etcetera.
Has anyone done a scan for DTC codes. They need to plug into the OBDII scan port and then let us know what the codes are.
The SCLM or Security Control Locking Module can cause problems with the Engine Management System. It is located beneath the fuse box in the boot/trunk. It sits at the lowest point and has a tendency to corrode. Remove it, unplug it and thoroughly clean the contacts. Also the X308 has numerous ground connections that will cause a no start. Particularly the one from the engine/transmission to the frame rail under the right side of the vehhicle to the rear of the front tire.

Try to get the code scan done and let us see what codes your getting if any.

 

Thank you Avern for your reply ;

I just come back from the workshop , driving the car back to home !

First of all , as I'm very very far to be an electrician , let me apologize for probably explaining badly to the readers here what I heard about the trouble..

So, The electrician explained to me that he had to make a shunt in order to make a sort of lure for the BPM : he displayed an extra wire coming with a fuse linked to the BPM in order to give energy; this allow the car to start , run ...etc

This allow the engine to start, run & the car to be driven ! The car must not be parked without disconnecting the battery (electricity drain will put the battery out of energy in a few days)

He told me that one wire among those coming from/to the BPM is out (not seen damaged but not feeded with electricity)// (??)

The radio/CD reader do not work anymore (not feeded)
The reverse radar (alarm) is no more working.

Seat settings ok/ lights Ok / panel board sign/engine revs ok..


Now , the what about the OBD2 codes ?

Remember that when the car felt in trouble , I used my basic OBD2 reader and got the 1230 code (as said in the beginning of this topic) ;

Now , no more 1230 code !

I have those ones : P1638 / P1642 / P1000


I have a doubt about the fact that this shunt/lure could also induce / add wrongs codes !! (??)


I will not drive the car as this shunt solution is only for bringing her to a Jaguar dealer in order to make a new BPM re-programing, (if it is confirmed that BPM is the source of the trouble ! )

As the car is now at home , I'll be free to spend some time investigating for SLCM box's contacts !


Thank you very much for reading !

Thierry

How can I change this topic title ? I believe it will not help for any people looking for any real P1230 trouble code !

 

Some pictures about :

1st code when the car felt in trouble (now this has been replaced by P1638 / P1642 / P1000):





The BPM (gloves box removed) :





the "Shunt"that allow to start the engine :








Engine at idle :




Connections in trunk (no corrosion)





SLM (connections checked)