How can make a chip for 14cux
Discussion
Hi,
During my trouble shooting with my '95 chimaera 400 I've seen my ecu is running a wrong file.
It seems the ECU has been replaced in the past, unfortunately with the wrong tune.
In rovergauge it's shown tune 2422 (pre cat) while mine should be at least 2967 (cat), this could be the cause of why I do not have a target idle and hopefully also has something to do with the rough idle & high emissons
I'm in contact with Frank but his burner is not working for the moment.
If there are upgraded tunes possible, like higher rpm or adjusted to my cam (piper 285), cat delete + shorten trumpets that would be even better of course (still need to be in mot range).
Please let me know who could help me.
Pictures of the ECU and chip
Thank you
During my trouble shooting with my '95 chimaera 400 I've seen my ecu is running a wrong file.
It seems the ECU has been replaced in the past, unfortunately with the wrong tune.
In rovergauge it's shown tune 2422 (pre cat) while mine should be at least 2967 (cat), this could be the cause of why I do not have a target idle and hopefully also has something to do with the rough idle & high emissons
I'm in contact with Frank but his burner is not working for the moment.
If there are upgraded tunes possible, like higher rpm or adjusted to my cam (piper 285), cat delete + shorten trumpets that would be even better of course (still need to be in mot range).
Please let me know who could help me.
Pictures of the ECU and chip
Thank you
Could be someone has swapped the chip or complete ecu, I can not find anything in the histo.
It's running on fuel map 5 according to rg, so the correct tune resistor is installed.
However in rg I also can read tune 2422 which is fault, this appeared to me because it doesn't activate target idle (green light) or show the target rpm. When searching on pH I found some others who had same issue and could only be solved by changing chip to correct newer tune, please correct me if I'm wrong.
It's running on fuel map 5 according to rg, so the correct tune resistor is installed.
However in rg I also can read tune 2422 which is fault, this appeared to me because it doesn't activate target idle (green light) or show the target rpm. When searching on pH I found some others who had same issue and could only be solved by changing chip to correct newer tune, please correct me if I'm wrong.
Edited by haaren on Saturday 16th August 09:45
Belle427 said:
I would ask the guys on this thread just to confirm.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Done, thank you for pointing out https://www.pistonheads.com/gassing/topic.asp?h=0&...
davep said:
Unfortunately you have a Land Rover 3.9 CAT Prom chip, Tune Ident 1A07, in your car's ECU. Your TVR would greatly benefit from having TVR Chimaera 400 CAT prom, Tune ident 1A17, installed. The fuelling map will change for the better, RPM limit range will be extended to 5800 rpm and base idle will be increased to 850 rpm. Your current issues should be resolved with the correct chip in place.
The link above and SteveSprint's website provide all the information needed to install the correct chip or upgrade as required:
http://www.remap-14cux.uk/bins/
Good luck.
Hi Dave, thank you for confirming.The link above and SteveSprint's website provide all the information needed to install the correct chip or upgrade as required:
http://www.remap-14cux.uk/bins/
Good luck.
Edited by davep on Saturday 16th August 13:04
It's even a range Rover tune.... Let's hope I find someone who can make a chip an solve some riddles
CGCobra said:
I've been replying to you on the main re-mapping post, probably best to keep replies specific to your query here now.
As I've mentioned there I'd be more than happy to create a chip or two for you (looks like you are in the Netherlands which shouldn't present a problem) if you point me to the exact one(s) you are looking for, ideally on Steve Sprint's site.
You should be able to send me e-mails now. Let me know if not.
Looking at your RG screen some things seem a bit odd, possibly due to your chip or maybe due to something physical not being correct.
You are not getting idle mode. I'd put this down possibly to your Throttle Possition being at 4%, although this may not be the case if you checked 'Corrected'. Could be due to your throttle being slightly pressed but then I'd expect your RPM to be higher.
I've spent quite a lot of time on the code but only in the later (3652 IIRC) version. In this it seems to constantly monitor the TPS output and treat the lowest reading found as the closed position which means the TPS position has a bit more tolerance, and possibly allows the value to be corrected if you start the car with throttle depressed. I believe early code versions required the TPS output to be a much more exact value for the ECU to understand zero.
The trim values seem high possibly due to not running an appropriate map. Hopefully this will improve when you get a better map.
I tend to look at MAF with the 'Linear' setting checked, it reduces the non-linear nature of the sensor.
Based on what I've been looking at recently your Idle Bypass Position seems a bit low although my logic is that lower is better than higher (may not be right though!).
I've send you an mail with more details, if not received let me know.As I've mentioned there I'd be more than happy to create a chip or two for you (looks like you are in the Netherlands which shouldn't present a problem) if you point me to the exact one(s) you are looking for, ideally on Steve Sprint's site.
You should be able to send me e-mails now. Let me know if not.
Looking at your RG screen some things seem a bit odd, possibly due to your chip or maybe due to something physical not being correct.
You are not getting idle mode. I'd put this down possibly to your Throttle Possition being at 4%, although this may not be the case if you checked 'Corrected'. Could be due to your throttle being slightly pressed but then I'd expect your RPM to be higher.
I've spent quite a lot of time on the code but only in the later (3652 IIRC) version. In this it seems to constantly monitor the TPS output and treat the lowest reading found as the closed position which means the TPS position has a bit more tolerance, and possibly allows the value to be corrected if you start the car with throttle depressed. I believe early code versions required the TPS output to be a much more exact value for the ECU to understand zero.
The trim values seem high possibly due to not running an appropriate map. Hopefully this will improve when you get a better map.
I tend to look at MAF with the 'Linear' setting checked, it reduces the non-linear nature of the sensor.
Based on what I've been looking at recently your Idle Bypass Position seems a bit low although my logic is that lower is better than higher (may not be right though!).
Edited by CGCobra on Tuesday 19th August 20:35
If I remember it correct then the corrected tps value was 0, to be sure I will test it tomorrow.
Normal you should have target idle or co voltage, non are shown in my rg. I turned the co screw and it did react to it by hearing, I need to go to garage if it also reacts on emissions, that would be great if I can get it below 0,5....
The settings in rg are done as frank / blaze likes it, from there I'm trying to understand all what I see and happen. I do have some experience with working on cars (many many years ago I started as a mechanic), however the tvr is more complicated/ my issues are more complicated. Everything I check is sort of ok or not likely the cause to let it run like it is now.
If you want to see some different data from rg with other settings, please let me know and will do a run tomorrow. There are some small things I want to do/check, if these still be ok I'm getting out of Ideas.
I want to thank everybody for your help, I really appreciate all tvr members who share the information they have to help others
Edited by haaren on Tuesday 19th August 22:19
Thank you for all your help, looking forward to see what will happen with the correct file.
Just tested rg with other settings:
Maf 0 and tps 0, with cold start stepper is 30% but will slowly go back to 4-5% when hot.
Strangely if you make more rpm, the maf keeps 0.
Is it normal that maf will remain on 0 when selection is on linear?
Putting selection back to direct will give direct a normal reading:
Strangely also my mill light in rg was on, checking on faults but there where non. Disconnected and connecting again would remain light on and no error code. Switching engine off, disconnect, start engine and connect, the mill light was off again??
No idea what that was.
Let me know if you have any thoughts about above data/info, thank you.
Just tested rg with other settings:
Maf 0 and tps 0, with cold start stepper is 30% but will slowly go back to 4-5% when hot.
Strangely if you make more rpm, the maf keeps 0.
Is it normal that maf will remain on 0 when selection is on linear?
Putting selection back to direct will give direct a normal reading:
Strangely also my mill light in rg was on, checking on faults but there where non. Disconnected and connecting again would remain light on and no error code. Switching engine off, disconnect, start engine and connect, the mill light was off again??
No idea what that was.
Let me know if you have any thoughts about above data/info, thank you.
davep said:
If by default you mean Map 0 (aka Limp Home Map], there is no defined data location for a RPM Limit in that map. The RPM Limit is tune specific so only appears in each of the five other maps.
Map 2 is indeed for open loop fuel management. The chip in haren's ECU must have a Map 2 tuned for TVR 400 Precat & 250 bhp, because the 6250 rpm value is unique to that tune. Given that the dates on the ECU case and PROM indicate this is a very early car, it could be that it started life as a non-CAT (TVR may have built a few 'precat' Chimaeras in 1992/3). Upon arriving in Holland the new owner changed the tune resistor to Map 5 for emissions reasons not realizing that the car would now run as a Land Rover 3.9 CAT.
I measured pin 5 and 27, this is 3880ohms. Resistor has withe wires so it's cat version. Car is registered as 1995, should always be with cats. I have a picture when it was just in nl, about 13 years ago, back then it already run on 2422. This guy did the rework and put it on a rolling road, it had 265hp. So the 250hp chip is tvr hp or it doesn't have it, camshaft and cat delete would be more as +15hp. Map 2 is indeed for open loop fuel management. The chip in haren's ECU must have a Map 2 tuned for TVR 400 Precat & 250 bhp, because the 6250 rpm value is unique to that tune. Given that the dates on the ECU case and PROM indicate this is a very early car, it could be that it started life as a non-CAT (TVR may have built a few 'precat' Chimaeras in 1992/3). Upon arriving in Holland the new owner changed the tune resistor to Map 5 for emissions reasons not realizing that the car would now run as a Land Rover 3.9 CAT.
Edited by davep on Thursday 21st August 12:54
Don't understand how it can be map 5 and 2 together, rg always show map 5. Nevertheless, when I received the post with new chips, I will directly mount it. Hopefully a lot of riddles will be solved.
Edited by haaren on Saturday 23 August 08:43
Forgot to mention yesterday:
In map 5 you should see a target idle xxx rpm, in map 2 you should see co trim voltage.
Mine doesn't show any of them, so maybe it's a map 3,5 or something
Let's see what will happen next week...
O and I had 2 empty spaces in the ECU connector, but I expect this is normal.
In map 5 you should see a target idle xxx rpm, in map 2 you should see co trim voltage.
Mine doesn't show any of them, so maybe it's a map 3,5 or something
Let's see what will happen next week...
O and I had 2 empty spaces in the ECU connector, but I expect this is normal.
Edited by haaren on Saturday 23 August 08:42
davep said:
Looks like you are missing pin 31 on the 14CUX connector which is the ground reference for the diagnostic data link, hence the gobbledegook coming out of RoverGauge, probably.
You need a new connector, or reinsert a new pin socket.
Could be the previous owner has deleted this wire, he has made the USB cable direct in the loom and have direct contact from the dash. I will ask him if he has done this, the other is always empty?You need a new connector, or reinsert a new pin socket.
Checked if there was a loose wire behind the connector, but this isn't so no loose wires on inside the connector
Cobra, I send you the ROM image. Please let us know if there are some differences
Gassing Station | Chimaera | Top of Page | What's New | My Stuff