Attention: geek-speak here.

I figured some people would wonder which tuning devices might be able to handle the S-Type's PCM, so I took the lid off one (from a 3.0 mid-2003 car, i.e. redesign). It's a Denso box, marked 2R83-10K975-BE X202 MB079700-9043

There are two CPUs, each marked 64F7055F40. Picture of one (from another car) here:
http://forums.openecu.org/download/file.php?id=1918

They are Renesas CPUs, some doc here:
http://america.renesas.com/fmwk.jsp?.../sh7055_group/
http://documentation.renesas.com/eng...45_sh7055s.pdf
http://documentation.renesas.com/eng...16_sh_2esm.pdf

So, 256-pin CPUs with about 50MIPS, 512K flash, 32K RAM and 2 HCAN buses each.

Bearing in mind the jag tech docs about the original (1999) S-Type, one CPU is almost sure to be dedicated to the injector-related, vital engine control stuff and the other will do everything else.

The Renesas chip family is used (often as a single CPU) in lots of other PCMs, such as RX8 and I understand what tends to be known here as the Scooby (Subaru Impreza such as WRX STi).

The latter is tuned (don't know whether the RX8 is) and I think openecu and ecomodders may have software etc. Certainly there are lots of threads about the Scooby PCMs so may be worth a read.

I don't know if the Scooby PCM has twin CPUs (yet).

 

Thanks jagv8. Perhaps one of the electrical/software engineers here can make some sense out of your find.

 

Or look for hardcore tuners / tuning firms / tuning forums

 

finally a lead!!! thank you Jagv8!

 

You're welcome. It's only a start, though. I'd be looking at Impreza tuners first as I believe they routinely upload/download their own software as well as fuel etc maps. Er.... and probably do engine damage if they get it badly wrong

Possibly also (Mitsubishi) Evo places.

But any engine using the Renesas family (goes by various names and numbers, so could be quite a search) is a possibility.

I wonder whether EcuExplorer could be made to work. It's open source (free).

 

my main issue is that I have not been able to read the strategy tables, once we can read the table we can begin deconstructing the PCM, and tunning later.

I've been attempting to map the strategies by dataloging every time I get in the car. and so far its been a slow tedious number crunching process which is not accurate but close.

 

According to Jaguar documentation, 1 processor deals only with throttle control, and the 2nd for all other tasks. I have looked with my tuner when we were searching for certain maps/values, and you don't want to know how much (look alike) data is there. He is a professional Volvo tuner that use the same denso ecu's, so from there he has gained some good knowledge on how these work. But still it was a pain to find certain areas of interest in the Jaguar ECU. I don’t want to discourage you, but if you are not able now to find the right fuel/ignition maps now, then you possibly going to waste a lot of time even more. Some tuners do have info from the factory where maps/data is located, which is helpful to say the least ;-). Best shot you have is to be able to read your ECU, ensure you do it clean (i.e. all adaptive values flushed), and send of your ecu to have it tuned in the UK. Then afterwards you can compare…
Anyway good luck!

 

Well having a new Civic Si myself which is lightly modified, I can say that it is no small task to try it yourself.

Mine had to be sent in to an outside company (Hondata) and they do all of the remapping to make sure that no codes or vital functions are erased. Hondata also raises the redline of the engine to 9k.

It would be interesting though if it all worked out!

 

Someone on the.co.uk forum has been having fun! Thread "tuning my type R":
"... having it rebored and a set of custom JE pistons put in, while its out the heads are being ported ... an AEM FIC8 ecu fitted"

http://www.jaguarforum.co.uk/viewtop...=38058#p353017

Don't know who the OP is but you may want to get asking about that AEM etc!

 

Wouldn't get to overexcited, it will be a big cost, for very small gain. You can't bore out to much there just isn’t enough material; I have investigated this some time ago (cut a 4.2 block in pieces amongst others).
Also swapping ECU doesn’t make any sense to me, the stock ECU does already a great job, has lots of room to increase performance, has a lots of safety features etc, and possible gains aren't worth the trouble imho.

 

I'm headed to Cobb tunning today they are going to plug in my PCM and see if thief tuning software can get in to look around. Let you guys know how it turns out.

 

Def. curious on what ya find.

 

For those not familiar Cobb Tunning is one of the leading scooby tuners out there

 

Has anyone looked into stand alone engine management like MegaSquirt or BigStuff (et al.)?

It was so nice having DSMLink for my Eclipses. Plug in a laptop and see/control everything. Both were OBD1 though.

 

Hope it will workout with Cobb tuning. The early AJ27 engines (for which I was searching a while back) have the same chips as the Subarus WRX and possibly the Mazda RX-7. Good luck.

 

Yep tossed around the idea of a piggy back since you can trick the stock PCM into receiving a signal when in fact the piggy back is actually controlling timing and injectors and fuel pumps

 

Cobb was unable to help. I was really hoping to have the same entry window but no dice.

Next step is to locate the white papers on this PCM decipher where the programing window is for the flash then see if the flash image can be copied out and then start decompling the code.

 

What happened? In detail, if you don't mind.
"programming window" - er, the days of those are long over! It's all done by data packets just as OBD-II. The thing I'd be tempted by would be bus snooping an IDS session
All you need is a carefully made Y cable (be cautious about the ISO!), a snooping device (elm327 will do) and then the tough part - IDS and I think you'll need an online subscription which MAY be fairly cheap for a short period and single car. Oh, and some software to handle the snooper (elm327: fairly easy).

A J2534 device (Drew Tech Mongoose etc) will cost more but is another way to go.

One snag is that there will be a security protocol (mode 27) - which IDS knows how to do of course.

 

@Mafioso,
Here is the easy way to program your ECU:
The tuner I have worked with didn't have a tool to for the older jaguars, so he simply used the WDS/IDS. For every car you wil find the programs/data on the WDS/IDS dvds (or harddrive when installed), and then it is just a matter of modifiing the maps on these files, and use the WDS/IDS to reprogram the ECU. It is that easy, realy, or at least as long as you are able to find the maps in the files...

I am still awaiting for CMD (www.CMD.it) to crack the code for the "older" jaguars, but last I heard was that they are having difficulties with the security. It is not on their priority list unfortunately. Don't get me wrong, I am probably not going to tune my ECU as I like the safety it provides amongst others.

 

Did you mean http://www.cmdtec.it/index.asp ?