Here is my question. If you take a evo and drive it hard, does the ecu "record" certain things? like throttle percentage or anything else that lets a dealer know how the car was driven?
I know Porrsche's are like that but im not sure about the EVO, and if it does. is there anyway to clear it out before you take it into a dealership.. so they cant say "abuse"?

 

yes it does.

was talking to a tech about that today as a matter of fact...

 

more details please

 

yes please elaborate.. what does it record? and more immportantly.. how can it be cleared?

 

well first i am not an expert by any stretch of the imagination, but based upon what the tech was telling me, it does log that info and he is able to see exactly how fast the car was going, how much load was on the engine and what rpm.. things like that....

my best guess would be to reset your ecu by taking off the battery terminal??

 

i wonder if just resetting the ecu is good enough. it seems like if mitsu is logging these things that would take measures to keep ecu's from being cleared..

anyone else want to chime in?

 

From an enthusiast's standpoint, the EVO uses the knock sensor to learn at least ignition timing and I think, boost. Fueling learning is still a mystery to me. I think it uses the knock sensor, or may also be able to correlate some O2 readings with itself.

jcnel.

 

If you throw a SES light, removing the battery does not clear the log. I was told this by the dealership when they were diagnosing my P0300 codes. I got annoyed by the light so I cleared it myself. They were still able to pull the data log from my SES light.

I don't think the ECU logs everything you do though. Although probably wishes it would so they could void more warranties for "abuse".

Why do you ask?

 

A lot of the logging features come down to OBD-II standards, and also how much a company wants to 'spy' on their car users.

As we purchase the vehicle as property (and hence have certain rights with that property) and therefore logging is a very hot topic. The current feeling on logging is enough to help diagnose a problem, but not so much as to be Mr. Spyware on how you drive, or in our case...warranty issues.

jcnel.

 

i only ask for future reference.. because i think that it would be a good idea for owners to clear there logs before they take them into dealerships..
so is there anyway this can be done?

 

most car's ECU has fuzzy logic, not just on the EVO... supposingly the purpose of the feature is to "learn" the driver's driving habit... as much as mitsubishi dealerships hate mods, the fuzzy logic feature also allows the ECU to compensate the different behaviors due to simple bolt on mods (increased volume of air flow from intake, for example)... Unplug the battery on your car for a few hours, and the ECU will supposingly reset itself... most people do so to reset faulty CELs

 

The ECU uses timing values from a lookup table. The knock sensor gives feedback to the ECU to retard timing from those lookup table values in the event of knock.

There are about 8-10 OBDII scans that get "set" in the ECU after completing the appropriate driving conditions. That's why smog techsrecommend driving OBDII cars for a few days before doing a smog test. These tests get cleared from the ECU everytime the battery gets disconnected. CELs are also cleared when you disconnect the battery.