OK - is it the same as any of the ones on JagRepair.com - Jaguar Repair Information Resource such as
http://www.jagrepair.com/images/Auto...cal-2005on.pdf
or
http://www.jagrepair.com/images/Auto...cal-2006on.pdf

(which are free)

 

Hi there glastron . . . are you saying that the measured battery voltage tests at 14V? Measured by an accurate multimeter between battery posts? Is that confirmed by using the integrated Engineering Test Mode? Are you further saying that the battery supply to the ECM is only 9.4V? If this is so BEFORE cranking, then you have a serious voltage drop between battery and ECM (and probably all other electronic modules). Check all B+ connections for corrosion, rust etc; and then check the main B- strap at the body connection. Flashing instrument cluster warning lamps; sound of clicking relays; then silence and no cranking . . . all these are dead certain pointers to low voltage.

As [JagV8] has stated, your symptoms are typical of a dead or dying battery . . . or perhaps a good battery with highly resistive restriction somewhere in either supply path. This is not a qualified guess on his part . . . but the product of seeing many hundreds of such problems. As noted, the spec for a 2.7L TTD is higher than any other variant for good reason - 95Ahr @ 800A should be seen as a minimum. For our cars we replace with nothing less than the Varta H3 Silver Series, which is rated at least 100Ahr @ 830A.

Try reading our "Battery 101 for S-Types" thread, now updated with regional supplements to cater for all major world markets to which the Jaguar S-Type was shipped. All will soon be downloadable from the S-Type Stickies, but even in its original form will answer most or all of your questions.

Ken

 

Try joining the Jaguar UK Forums site also . Not many diesels on this USA based site . 80% of UK Jags are Diesels ....

 

WHAT ??? Where did that figure come from? I do agree that there is a greater body of experience with all the Jaguar diesels on the UK forum but I don't see JaguarForums as exclusively "USA based" nor ignorant of the 2.7TTD.

But, 80% of UK Jags are diesels?

I would still hold that on the issues reported by the OP, the first and most obvious likely fault is low system voltage . . . so low that it drops through the floor when attempting to crank the high compression cold engine. Nothing to do with diesel.

Anyway, as an owner/driver/repairer of the later generation (ie post MY06) diesels, I offer my 2c for what it's worth. OMG "80%"? You might guess I'm finding that a trifle hard to swallow . . . coz Jaguar's own production numbers are a matter of public record, both for the body units by MY and for the various power plants.

Let us let that pass through to the keeper (with wry smile), and concentrate on properly testing the battery and connections.

Ken

 

This is not a US based site, more International with members worldwide, although we do have a high proportion of US / Canadian members.

It is also true that the UK forum will have a slightly better informed member group towards diesels as there are many more in the UK than overseas.

I do believe that there would have been a high number of diesel variants produced although think that 80% would be unlikley from the 26,125 that were made in 2004.

 

I'm comsdering a move up to a XF maybe summer next year . I checked out one of UK's biggest on line used car sites as I don't do Diesels , I asked for info on Petrol XF's


This site had 2943 Diesel XF's for sale .....& .....191 Petrol XF's for sale ...


Yea quite a large %% of UK Jaguars are Diesels ....

 

Totally agree about the large number of diesels in the UK fivespeed......its been going that way since the late 80's I guess.

Had my first company car back in '91 when Peugeots had some decent diesel engines at the time and its grown arms and legs since then.

Although high I still wouldn't go for 80%

Back on topic though, probably battery the first / best place to start looking and all connections as stated

 

I already have a long row 5 times ! it looks soft in the engine ECU . I replaced the ecu but I rewrote tal data from the old ecu . I'll try to return to the original soft new ecu and try it. There was a man with JLR online diagnostics and did not know the tips .

 

so third ecu and now it looks good , relais holds , can not be started . as a diagnosis with which the pair immo ?? Must be original ? or is it that even something else ??

 

Wwwooooo . . . [glastron] if you are into swapping and reflashing PCM/ECUs without the full dealer level tools, you are both a very brave man (or not); a very knowledgeable man (or not) but in any event . . . way out of my league.

And [Five Speed] . . . when re-reading my posts on percentage/volume of diesels, I regret I sounded so dismissive. Given your figures for your XF search, I now understand your position. Mine flowed from the topic then under discussion, which was the OP's 2.7L TTD S-Type. There were certainly many of these S-Types . . . but not in those volumes or percentages of production. I certainly intended no offense, and from your later calm explanation, I trust none was taken.

Best wishes,

Ken

 

You may have already done some serious damage to the car`s software. How did you replace the old ECU- by yourself or in a main dealer. Also as far as I can see from the video, the car actually has some power supply- but obviously not enough. Since it is a diesel it requires at least 95 ahr.

 

Now there is a third ecu and everything is behaving normally .... just need to learn immo . I have not met with such a glitch .... Today there is to be a man online JLR diag , taku we'll see ..

 

it works !!! finally !