Resetting pcm after tune?

S

shweetpickens

New member
I heard on another board that i should do a kam reset and transmission relearn after a tune and that it would make a noteworthy improvement.  I was also told i need an app called forscan and a high quality mx bluetooth adapter for this because a battery unplug wont cut it.  Anyone heard of this?

I've search for an over an hour so far and can't find much info on:
FORScan
Kam reset
Transmission relearn

Ive already got torque and a cheap bluetooth adapter
 
There are a couple of members which have had good results simply by just by flashing the tune prior....it sounds like you want to take her to the track correct? if so you will need to flash the tune a couple of days prior and drive it like you stole it theory relearn procedure.  Z    BTW use at your own risk may apply here.
 
ZSHO said:
There are a couple of members which have had good results simply by just by flashing the tune prior....it sounds like you want to take her to the track correct? if so you will need to flash the tune a couple of days prior and drive it like you stole it theory relearn procedure.  Z    BTW use at your own risk may apply here.
Click to expand...

Thanks for the reply.  No not doing any track work, just want the most from my tune.  I thought i was missing out on some more performance by not doing this.  If not then its no biggie.  Im about to replace the plugs and install the 3 bar map.  After i hope to learn and do a datalog for the first time to get some more performance outta the sho.
 
I would just follow the Battery relearn feature for optimum feel and performance and then load your new tune.  Z      Battery relearn
Because your vehicle’s engine is electronically controlled by a computer,
some control conditions are maintained by power from the battery. When
the battery is disconnected or a new battery is installed, the engine must
relearn its idle and fuel trim strategy for optimum driveability and
performance. To begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2. Put the gearshift lever in P (Park), turn off all accessories and start
the engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven to relearn the idle and fuel trim
strategy.
• Note: If you do not allow the engine to relearn its idle trim, the idle
quality of your vehicle may be adversely affected until the idle trim is
eventually relearned.
When the battery is disconnected or a new battery installed, the
transmission must relearn its adaptive strategy. As a result of this, the
transmission may shift firmly. This operation is considered normal and
will not affect function or durability of the transmission. Over time the
adaptive learning process will fully update transmission operation to its
optimum shift feel
 
I have been shocked how much a KAM reset and trans relearn has affected the car. I have flashed tuned many many times over the last 6 months and still had some odd issues and sluggish shifts. I finally did a KAM reset about 3 weeks ago and that was ok, it helped some esp with how quickly a tune adjusted to my driving however I still had odd, sluggish shifts in spots. Did a KAM reset and trans learn last sunday and its like a new car.


I don't think you need to do it with every flash but with significant mods or if you are seeing some odd transmissions issues I highly suggest it. SCT can do a KAM reset, Cobb can do both, Forscan with the correct connector can do both. I am not sure what the battery reset does exactly, likely KAM, maybe both? The menu option or Forscan is much quicker.


If you are hitting the track make sure you have a week or so before you go it will take at least a couple hundred miles before your OAR returns to normal after the KAM reset. You will be running richer than usual for a little while too.


For a lot of troubleshooting transmission issues, issuing a re-learn is step 1.
 
I did mine after, likely the best way from a learning perspective. You should only need to do it after major changes (stock to custom tune, or major mod) or if you want to reset things for some reason. A simple datalog based revision if you already reset last revision should not really need it.
 
Ramairetransam said:
what is a kam reset ?
Click to expand...
Keep alive memory (KAM)

Resets all the adaptive parameters  in the car 
Stuff that normally gets saved when the battery is removed.

https://m.youtube.com/watch?v=hZAsoqmqhdM
 
So I was under the impression that when you flash your ECU it clears out the KAM during the flash... This is why your fuel trims, OAR, and adaptives get reset after a flash. That's why after a flash your transmission shifts harder because everything gets reset...

Think about the reverse if your KAM didn't get reset then you flash... Then your fuel trims could potentially be VERY off causing all kinds of issues... Your OAR could be off causing too much spark advance which leads to knocking... Your transmission wouldn't have baseline starting point to adjust the adaptives...

Guessing at this, but based on my logging, after a flash, most learned values get reset..



Sent from my Nexus 6P using Tapatalk
 
StealBlueSho said:
So I was under the impression that when you flash your ECU it clears out the KAM during the flash... This is why your fuel trims, OAR, and adaptives get reset after a flash. That's why after a flash your transmission shifts harder because everything gets reset...

Think about the reverse if your KAM didn't get reset then you flash... Then your fuel trims could potentially be VERY off causing all kinds of issues... Your OAR could be off causing too much spark advance which leads to knocking... Your transmission wouldn't have baseline starting point to adjust the adaptives...

Guessing at this, but based on my logging, after a flash, most learned values get reset..



Sent from my Nexus 6P using Tapatalk
Click to expand...

Most adaptive parameters do get reset after a flash, however, items like OAR do not reset due to a flash. While not necessary a major concern, this could be an issue if you go from an E blend tune to a straight 93 octane tune, just before changing fuels, or something similar.

My Recommendation is to do a KAM reset upon major modifications, like stated, or upon fuel type changes, especially if going to worse fuel. It takes only a few seconds to do one with an SCT (if that is how you're tuned) and doesn't take super long for the car to relearn. Better safe than sorry IMO
 
derfdog15 said:
StealBlueSho said:
So I was under the impression that when you flash your ECU it clears out the KAM during the flash... This is why your fuel trims, OAR, and adaptives get reset after a flash. That's why after a flash your transmission shifts harder because everything gets reset...

Think about the reverse if your KAM didn't get reset then you flash... Then your fuel trims could potentially be VERY off causing all kinds of issues... Your OAR could be off causing too much spark advance which leads to knocking... Your transmission wouldn't have baseline starting point to adjust the adaptives...

Guessing at this, but based on my logging, after a flash, most learned values get reset..



Sent from my Nexus 6P using Tapatalk
Click to expand...

Most adaptive parameters do get reset after a flash, however, items like OAR do not reset due to a flash. While not necessary a major concern, this could be an issue if you go from an E blend tune to a straight 93 octane tune, just before changing fuels, or something similar.

My Recommendation is to do a KAM reset upon major modifications, like stated, or upon fuel type changes, especially if going to worse fuel. It takes only a few seconds to do one with an SCT (if that is how you're tuned) and doesn't take super long for the car to relearn. Better safe than sorry IMO
Click to expand...
You OAR DOES get reset after a flash. That is a fact...

Sent from my Nexus 6P using Tapatalk

 
StealBlueSho said:
derfdog15 said:
StealBlueSho said:
So I was under the impression that when you flash your ECU it clears out the KAM during the flash... This is why your fuel trims, OAR, and adaptives get reset after a flash. That's why after a flash your transmission shifts harder because everything gets reset...

Think about the reverse if your KAM didn't get reset then you flash... Then your fuel trims could potentially be VERY off causing all kinds of issues... Your OAR could be off causing too much spark advance which leads to knocking... Your transmission wouldn't have baseline starting point to adjust the adaptives...

Guessing at this, but based on my logging, after a flash, most learned values get reset..



Sent from my Nexus 6P using Tapatalk
Click to expand...

Most adaptive parameters do get reset after a flash, however, items like OAR do not reset due to a flash. While not necessary a major concern, this could be an issue if you go from an E blend tune to a straight 93 octane tune, just before changing fuels, or something similar.

My Recommendation is to do a KAM reset upon major modifications, like stated, or upon fuel type changes, especially if going to worse fuel. It takes only a few seconds to do one with an SCT (if that is how you're tuned) and doesn't take super long for the car to relearn. Better safe than sorry IMO
Click to expand...
You OAR DOES get reset after a flash. That is a fact...

Sent from my Nexus 6P using Tapatalk
Click to expand...

Maybe my SCT X4 is just buggy then...

I have never seen OAR change after a flash, either from stock or from custom tune to custom tune. However, when I did a manual KAM reset, it went to 0, and learned again.
 
derfdog15 said:
StealBlueSho said:
derfdog15 said:
StealBlueSho said:
So I was under the impression that when you flash your ECU it clears out the KAM during the flash... This is why your fuel trims, OAR, and adaptives get reset after a flash. That's why after a flash your transmission shifts harder because everything gets reset...

Think about the reverse if your KAM didn't get reset then you flash... Then your fuel trims could potentially be VERY off causing all kinds of issues... Your OAR could be off causing too much spark advance which leads to knocking... Your transmission wouldn't have baseline starting point to adjust the adaptives...

Guessing at this, but based on my logging, after a flash, most learned values get reset..



Sent from my Nexus 6P using Tapatalk
Click to expand...

Most adaptive parameters do get reset after a flash, however, items like OAR do not reset due to a flash. While not necessary a major concern, this could be an issue if you go from an E blend tune to a straight 93 octane tune, just before changing fuels, or something similar.

My Recommendation is to do a KAM reset upon major modifications, like stated, or upon fuel type changes, especially if going to worse fuel. It takes only a few seconds to do one with an SCT (if that is how you're tuned) and doesn't take super long for the car to relearn. Better safe than sorry IMO
Click to expand...
You OAR DOES get reset after a flash. That is a fact...

Sent from my Nexus 6P using Tapatalk
Click to expand...

Maybe my SCT X4 is just buggy then...

I have never seen OAR change after a flash, either from stock or from custom tune to custom tune. However, when I did a manual KAM reset, it went to 0, and learned again.
Click to expand...
Hmm I wonder then if it's strategy specific then? My OAR always got reset to 0 after I flashed.. and that was with Unleashed, AJPTurbo, And LMS tunes.. and all three mentioned to let my OAR even out before logging..

Sent from my Nexus 6P using Tapatalk

 
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