Resetting remapped ECU back to standard

[DannyR]

So car is over fuelling, gets 30mpg on normal easy driving, failed MOT miserably.

Lambda is new, it's not the cat, I've always thought it was the remap.

Is there an easy may of removing it? Some older cars I believe could be reset by removing power to ECU for a long period of time.

Any help much appreciated!

Cheers
Danny

 

[m&l172ph1]

Mine was high when i took it for mot a couple of weeks ago but knowing the tester he brought the revs up to clear it and it only just passed it.

 

[jinjur]

Don't think it works that way bud.
Say, you dig that Nokia 3210 out of your cupboard that has been dead for yeaaaaaaaaaaaaaaars and put it on charge, when it wakes up, it always knows how to ............phone :smile:

A remap has just told the ECU to do that differently but behaves the same way, its hard written to the flash memory.

Only way to go back to stock is an RSTuner from a backup/donated stock map (if it was RSTuner mapped) or back to the agent that did it

Or, I am sure Renault could flash the stock ECU on again, perhaps rewrite the latest version for your ECU....for £££ of course


Oh, and FWIW....mine is RSTuner mapped and basically blows trees and flowers out of the exhaust at MOT time. What type of map was it?

:wink:

J

 

[DannyR]

Don't think it works that way bud.
Say, you dig that Nokia 3210 out of your cupboard that has been dead for yeaaaaaaaaaaaaaaars and put it on charge, when it wakes up, it always knows how to ............phone :smile:

A remap has just told the ECU to do that differently but behaves the same way, its hard written to the flash memory.

Only way to go back to stock is an RSTuner from a backup/donated stock map (if it was RSTuner mapped) or back to the agent that did it

Or, I am sure Renault could flash the stock ECU on again, perhaps rewrite the latest version for your ECU....for £££ of course


Oh, and FWIW....mine is RSTuner mapped and basically blows trees and flowers out of the exhaust at MOT time. What type of map was it?

:wink:

J

Older type ECU's seemed to clear stuff when left with no power for a while, I remember it from the 16v days!

I didn't have it mapped it was done previously, apparently an RSTuner map. Either way it looks like it's going to cost me money then FFS!

Anyone know if it's possible via CLiP to wipe ECU to standard?

 

[jinjur]

I had a remapped Honda, old school Superchips remap and i was able to reset calibrations etc by leaving the ecu unplugged for a while but not the base maps.
Cars only have one version of the software they run AFAIK.
Pretty sure CLiP has the power to fix what you need done......

 

[markoc]

Disconnecting the power does work on some ECU's. I had a Fiat Coupe and that was the case...but I think it only resets the some of the parameters - like the short term fuel trim. I think it basically reverts to the base fuel / ignition map and the ecu 'relearns' the ideal fuel/ignition values using various sensors ...lambda/knock sensors.
Maybe some of the clio experts can say if its the same case with our ECU's?

 

[DannyR]

I had a remapped Honda, old school Superchips remap and i was able to reset calibrations etc by leaving the ecu unplugged for a while but not the base maps.
Cars only have one version of the software they run AFAIK.
Pretty sure CLiP has the power to fix what you need done......

I've found out CLiP does but I need the proper Renault file on disc and a programming code so doesn't look good.

Disconnecting the power does work on some ECU's. I had a Fiat Coupe and that was the case...but I think it only resets the some of the parameters - like the short term fuel trim. I think it basically reverts to the base fuel / ignition map and the ecu 'relearns' the ideal fuel/ignition values using various sensors ...lambda/knock sensors.
Maybe some of the clio experts can say if its the same case with our ECU's?

Yea I knew it only did parameters within the mapping and not deleting everything from it! I'll give that a go, otherwise looks like I'm needing to buy an RSTuner and find someone with a standard ph1 .cal and .rst file?

 

[bloke]

i'd say to prove it is the map first before you remove it.

 

[DannyR]

MOT test is 0.2% carbon monoxide levels, a decat will see that raised to about 0.8-1%.

My reading was 8%!! I have a new lambda and no misfiring. A lambda sensor would usually give an average MPG of about 20 if it wasn't working.

The only other things at MAP sensor or the fuelling controlled by the ECU, there isn't much else to check.

 

[jinjur]

temp sensor or something along those lines maybe as well?
car thinking it was fuelling for cold start
dunno bud

 

[DannyR]

It shouldn't be that bad on cold start either.

The only time I've seen something similar is when one my supercharged ones had the wrong map sensor and was chucking black soot out of the back! This doesn't smoke or anything but just gives me reason to think.

Got @dmallett helping Sunday with lots of spares.

 

[bloke]

i had one in for test that was running close on 12% fwir, it actually set of the carbon monoxide detector in the flat above the test centre!!

have you had it on live data to see if it is switching?

 

[bozothenutter]

I had this recently.....either CO or lambda was right....but never thw two at the same time.
Tester told me to give it hell on the road for a bit and come back.....it just passed.

 

[DannyR]

i had one in for test that was running close on 12% fwir, it actually set of the carbon monoxide detector in the flat above the test centre!!

have you had it on live data to see if it is switching?

Am I able to do that via CLiP? I've not tested anything yet, luckily I have a spare lambda which I could try too.

 

[Diagro]

If it's an rstuner map you may find your ecu is locked.
better to go buy a new ecu kit from eBay for 60 quid to get the stock map back

 

[DannyR]

I'm hoping I don't need to spend anything major yet. I'll try lambda and map sensor and see if that helps.

 

[dmallett]

I ain't got spare lambda

 

[DannyR]

I have lol!

 

[bloke]

Am I able to do that via CLiP? I've not tested anything yet, luckily I have a spare lambda which I could try too.

even a cheap nasty code reader should give live data, run it up from cold, keep an eye on the coolant temp and when it's up to temp see what the voltage is doing.

 

[DannyR]

even a cheap nasty code reader should give live data, run it up from cold, keep an eye on the coolant temp and when it's up to temp see what the voltage is doing.

Cheers, what should the voltage be doing?