Hi All,
I need to know how to remove the ECU unit from behind the glove box, I can see it but unable to remove it. X350 2004.
Can anyone help.

regards.

 

you will need a tamper proof hex head drive...plus a 10mm socket,plus a 3/8 adaptor at least 10 inches...you start by removing the cowl on the front passnger side.It is the pollen filter housing. which is held by 4 10mm bolts.Once you remove them disconnect the washer lines be careful not to damage them,once the bolts are removed just lift the upper cowl rim up and the pollen housing,and you will see the ecu harness.It will be held to one 8 or 10mm bolt on each side,but the center harness bolt will be a tamper proof hex head.I think the size is 30 or 27.Once you remove these three then the harness will come out exposing the pins etc.Then you go inside to the passenger side kick panel and remove the inside bolts...Let me know..and also make sure you disconnect the neg term from batterry...happy wrenching.

 

Hi 912guy,
Thanks for the reply, I'm having a problem with that 'special tool' Not sure if its a 5 sided torks bit, a six sided torks bit or hex head anti-tamper bit?

regards.

 

yes it is the regular troque head bit with a tiny whole in the middle...if memory serves me correct its the 6 sided one..may I ask why your changing the ecu?At times the pins will be corroded and have a bad connection.If this is the issue try using electro-motive electrical terminal cleaner..spray it on the pins and take a air hose and blow it out good...This stuff is awesome...I have used it several times...corrosion will cause the pins not to seat correctly and give a low circuit output.or a mil indication.

 

Hi 912guy,
I had an issue with water filling up the pollen filter box, and at the same time engine going into limp home mode with all the error messages flashing up on the dash.
I suspect the both are connected, and when looking from the inside behind the glovebox I saw a little water running fron the unit.
From the forums I found its a common problem when the drain gets blocked, but hopefully when the unit is removed I can check for the signs of water damage and corrosion.
If off course it looks perfect I'm lost for the cause?

regards.

 

yes sounds like your on the right track...make sure that the water is being guided away from the ecu harness, you will see a foam liner underneath the pollen housing cowl..this liner will at times get bent,damaged or wont block the water frombeing guided away from the firewall.and yes clean the upper water catcher located in the corner of the frame to make sure the water is draining properly.But your on the right path...

 

Hi 912guy,
OK, for the record, the bolt that holds the connector onto the ECU is a 5 sided security Tork T30.
I managed to remove it, then found a coating of 'white corrosion' in the box which can be wiped clean, and a little water on the board which was blown away with a hair dryer. Sprayed the board and pins with contact cleaner, rebuilt the unit, installed it in the car, and guess what!!!!!! Just the same. Same error messages and not starting.
Im just about to clean the earth points at the front of the car and the one by the pollen filter. I'll let you know what happens.

regards

 

thanks for the clarification, I could remember if it was 5 or 6 sides, but ouch sorry it did start,did you try the electro-motive spray by crc? This stuff is good and will most of the time clean the contacts to reastablish communication.I have the pin layout somewhere on the ecu show show which pin could be the culprit to stop comunication.I have to look for it..

 

Hi 912guy,
It was Servisol switch cleaner and lubricant, seem to work ok, If you could get some pin-outs for the ECU that would be great.

regards.

 

Hi All,
Managed to snap off 2 of the earth points at the front of the car, drilled a couple of new holes, cleaned off the paint, and bolted them back on, the one by the pollen filter seemed ok.
Went to turn the key and yes, still the same????
Need to ID the pins out and in of the ECU to see what is and what is not connecting?
Does any one know a connector between the ECU and its feed?

 

ok I found the ecu pin layout...my camera isnt that good but I will take a pic of the layout and send it to you....I beleive I have v8 and v6 motor pin layouts...I am hoping it will be clear....Now my print shows just the pins and id numbers not the function,I get the function information from a jaguar tech.May I ask what function your looking for?

 

Hi 912guy,
From what I can gather, If one or more inputs are not detected from any of the CAN netwok devices, then the thing just shuts down and tries to protect itself.
I hope what I need to check, is available inputs from these devices, not 100% sure what and where there are yet.
Any help wih that would be great.

regards.

 

It could very well be an issue if there is no communication. The CAN can be tested at thew OBD II connector pins 6 and 14. When checking resistance it should read 60 ohms. We then need to check the CAN at the ECM. Ohm out pins 123 and 124 and you should read 120 ohms.

 

Here is a pictrure of the pin layout....

 

as you can see pin 123 and 124 are on the upper left side labeled G and Y..counting from the left to the right...pay no mention to the arrow...that was for me locating the knock sensor pin on another xjr when I perform a overloop test...let me know how things work out...sorry for the poor quality picture.

 

Hi 912guy,
Thanks for that, i'll check it out as soon as possible.
I'll let you know..

regards.

 

Here is a PDF version if you need it.

 

Thanks, That will be useful..

regards.

 

thanks a lot for that,very very useful....

 

Hi 912guy,
I'm having difficulty finding the pin numers for the OBD2 connector by the centre console?
Dont suppose you have a layout?

regards.