Asking on behalf of my brother, what are the correct ways to reset ur car ecu manually ? I heard that u can do it by removing the battery terminal and then attach it back ? What are the correct ways to do it ? And also what are the benefits of doing it >?

no benefit indeed. Some says better fc after reset.

what car??

not all cars just plug in the ecu and roll out of the factory, most ecu has to be programed to a fuel/o2 balance mixture, auto transmission shifting, cam/valve timing, etc.

by removing battery only allow the ecu back to zero or "default", doesnt mean that the setting is same as the time when it roll out from the factory.

pro: cheap way to reset ecu if the program is messed up
con: most obvious issue is the auto transmission shifting timing problem & jerkiness

correct way: send your car back to service center for ecu reset, they will reload the program after resetting the ecu.

I would say depending to the car itself. Toyota's ECU will be able to relearn after being reset(or change battery outside)
While Wira VDO ECU can be reseted and not much problem after that.
Most ECU has a fail safe(or default) setting, it might not be the best, but still can work... Only FC slightly higher...

Still, cannot find a reson to deny your statements on send back your car for checking...

plug out the plug in negative terminal of the battery for 10-15mins then plug it back, your ECU should be reset by now

no real benefit of doing it, want good fc, control your right leg

my bro driving saga blm auto

i have a blm auto as well and reseting ecu did help but not much cause it learns your style of driving again,all depends on your right foot and try to keep speed limit between 90-100km/h.

If use the wrong method to reset the ECU, for sure it won't have effect.....
Right way to reset an ECU is, you must drained out all the charge stored in the ECU....

how to drained out all the charge ?

Unplug +ve first or remove the fuse for ECU only. Then wait for 5-10 minutes.....

My friend is driving saga blm auto too, his fuel consume is very bad. Around 6.6km/L Full city drive.
he went to SC ask for reset ECU but been refuse unless give they test drive 112km. (Kuching-Serian)
he looking for other solution. Are other shop provide service?
Anyway, Service book important? what happen if gone?
I ask he where the service book, He say the Salesman tell him gone liao. (he purchase 2nd hand saga)

hmmm, service book is important if you are buying second hand car since the only prove that the car has been serviced is on the service book itself wihout the book , its quite hard to prove that the car has been previously serviced according to schedule which is the first 1000km, 5000km , 10000 km and so on Anyway, i think he can manually reset the ECU himself by unplugging the +ve side of the battery for overnight then plug it back

for saga blm if go for manual i think maybe still can save fuel and better pickup, some of my friend drive auto they say all makan minyak one

For Proton, is good to get manual tranny, auto it won't yield good results.....

Who taught you to unplug the +ve terminal first ?

This post has been edited by Maapu: May 25 2011, 01:44 PM

Negative terminal la dailou zzz

Then who thought you to remove -ve terminal first? Just do your self this simple test, which method can send your HU's settings go back to default.....

Both would remove the settings and the correct way is to disconnect the -ve terminal first. Some HU installers, esp when you have an expensive sound system, they might ground your HU directly to the -ve terminal of the battery. So in your case, by just removing the -ve terminal, you have not removed the -ve terminal for your HU and therefore have not disconnected the electrical circuit. In any other cars with only 1 -ve grounding source on the battery terminal, all electrical equipment would reset with the removal of the -ve terminal.

The correct procedure to remove the -ve terminal is to prevent sparking/arcing/surging of power when you reconnect the terminal.

This post has been edited by sleepwalker: May 25 2011, 02:35 PM

for safety purposes always remove the -ve terminal first to 'kill' the battery. it has been practiced many-many years and everywhere. no reason not to follow it.

This post has been edited by soulfly: May 25 2011, 02:36 PM