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Discussion Starter #1
I've found the procedure from charliex for resetting the lotus ECU - does this work for the new S 240 ECU? If not is there a different procedure? Would it be a bad idea to try it? - TIA - john.
 

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Discussion Starter #3
disconnect the battery(?)
Apparently that doesn't erased the "learned" stuff - is this false? I'm in the process of doing some performance mods - new IC, exhaust etc - rumor has it that it's good to unlearn the ECU after each mod? - john.
 

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Discussion Starter #4
Anyone?
 

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Discussion Starter #5
OK... so my Lotus tech said that the 08 ECU can be reset by disconnecting the battery and connecting the positive and ground leads for several minutes to drain all the capacitors in the system - this erases everything stored in the volatile ECU memory - john.
 

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Yeah thats a load of old bollocks, there are no capacitors inside the ecu that could retain data for that long, nor is there any battery backup.

The data on the 06, just like the 05 is stored on a flash memory which can retain the data without power for around 20 years , there are two ways of clearing the memory, one using a reset tool (learnreset) which you can get off my site and use a drewtech mongoose/cardaq/scandaq/cardaq plus, or method two damage the CRC (checksum) of the data block/erase it all together.

In order to damage the CRC you must turn off the power to the ecu when its saving the changes internally, this is done by running the car for a while, then removing the key and before you hear the click of the relays, remove all power, next time the ecu starts up it'll see the damaged data and reset it.

the latter method is tricky, but i do it all the time on my bench ecu its probably a good way of damaging the ecu too, so I wouldn't do it.

if you're unsure it worked, make it set a code ( fuel cap off is easy ) and the light is on, and an OBD II tools reports the code after a switch off/on cycle, then do the reset procedure and the code reader no longer reads the code its been reset correctly.

be aware not all codes will light the MIL/CEL after a restart, so a lot of people mistakenly see this as the ecu being reset, when in fact it isn't, you should still see a code on a proper OBD II reader.


you could potentially damage the flash memory by power spiking the ecu and causing it to reset or boot up incorrectly, but this isn't wise especially on an 06 ECU as they are very easy to damage, also you don't want to try to erase the flash chip on an 05 since it stores the learn in the same flash chip the program is stored, the 06 has two seperate areas of flashable memory for learnt data and program so its possible to kill it too, but a bit harder, if you manage to wipe out the chip only a specialised programmer can resurrect it, not any of the lotus tech tools.
 

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Discussion Starter #7
What about the 08 S 240 ECU - isn't this a different model than previous models? Also, what's in your pipeline for the 08 S 240 ECU - can you reprogram one? -john
 

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Same deal with the 08, yes i can reprogram it. I haven't confirmed my learn reset tool will work on the 08's as lotus disabled the advanced can bus diagnostics last year.

Theres probably a 240 change to 255/265 possible with it.
 

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ok so the battery trick doesn't work...

There's another way i heard which is to disconnect battery and pump the brake 5 times.

how about the ACC on, pump the gas pedal on over 70% off no more than 30% trick?

(i tried but don't know if my attempts were executed correctly)

thanks
 

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Charlie -
Does your response earlier in this thread mean that the method of resetting that involves turning the ign to ACC, then depressing the throttle, etc. doesn't work?

I couldn't find a reset tool on goth.am - do you have another site?

Jerry
 

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no its doesn't work unfortunately, its only for the efi euro ecu's.

its on monkey in the techlib.

the only ways of doing it, i described above, or a reflash.
 

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S-240 ECU Issue

OK... It's happened to me twice now... The car starts and runs perfectly but there are no dash lights, no tach, no speedo, no blinker indicator (blinkers work though) and no temp gauge...

The fix... Turn the car off... Keep a 10mm wrench handy and disconnect the positive terminal of the battery for a minute then reconnect... Start the car and everything works fine...

This has not happened for a while now but I still have the 10mm wrench in the car... Of course the Lotus dealer knows nothing of this issue :huh:
 

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First week I had mine the gauges stayed on after car was turned off. Tried everything, then just disconnected the battery for a few and all was normal.

Bummer is we usually know issues way before dealers do so everything is a challenge or new for them. I actually have a suspension clunk that they cant seem to figure out. Plus, now I have the abs light on... 3,000 miles.
 

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I've had the dash go out several times on my 240 as well. The weirdest thing was when the tach went backwards. The tach needle would go as high as 4k rpm at idle but when accelerating it would drop all the way down to zero and vice versa.
 

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First week I had mine the gauges stayed on after car was turned off. Tried everything, then just disconnected the battery for a few and all was normal.

Bummer is we usually know issues way before dealers do so everything is a challenge or new for them. I actually have a suspension clunk that they cant seem to figure out. Plus, now I have the abs light on... 3,000 miles.
Yes... I forgot to mention that the gauges stay on after the car was turned off...

I'm sure there will be an ECU update at some point to fix this problem...

Here's another problem with my S-240...

Does anyone have the problem with a snapping/clunking noise coming from right behind their head when going over bumps or rough roads... I cannot find the problem... I do know it's not coming from the INSIDE of the car... I feel it's coming from up in the roll bar area or just inside the window in the engine bay... Any suggestions?
 

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That recently just started. I removed the passenger side Velcro cover and it's louder but everything is tight... It's something that is getting annoying and one more thing to fix.

My initial thought was the build quaility was better but know after 3000 miles I thinking it's not...
 
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