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ECU Reset

23K views 11 replies 9 participants last post by  Charlie-III  
#1 ·
Hey all, Was thinking of doing an ECU reset. Have any of you done this? for what reasons? came across this online, talking about how to reset Hyundai's is this correct for the Tiburon? thanks

Firstly bring the car to normal operating temperature by driving for 15 minutes or so.
Now open the bonnet and disconnect the earth lead from the battery, ensure this is not touching any part of the bodywork - insulate if necessary - and wait 5 minutes.
Next depress the foot brake for 20 seconds - this will completely discharge the ECU's capacitors via the brake lights.
The next step (to be carried out immediately, while the engine is still warmed-up) is to carefully re-connect the battery earth lead, close the bonnet and now drive the car in a spirited fashion (accelerating rapidly through the gears, full-throttle straights etc. etc.) for a full 30 minutes. Try to choose a quiet time on the roads for this, (i.e. early on a Sunday morning!).

This period of driving will `re-educate` your ECU into adopting more aggressive timing curves and alter the fuelling to match. It will also allow the unit to recognise any modifications you have made and to react accordingly.
If, on the other hand, you are not interested in outright performance, but are more concerned with economy and flexibility, use your normal driving style during this 30-minute run!.
 
#2 ·
Or you could just pull the two fuses under the hood. Take about 2 seconds to do. Plus you don't have to reset your clock and radio. Its good to do, but don't make it a habit.
 
#5 ·
it's mostly done when you add upgrades such as CAI, SRI, Headers, Exhaust, BBTB, IM among other little things that can be added without the need of a piggyback.
 
#7 ·
Op. Your info is mostly wrong. A reset is mostly used to briefly clear a cel. Afterwards your car will run rich while it adjusts. Also this takes days to fully adjust. Drive it slower than normal.

Take the negative off the battery. Hold the brake 30 seconds. Your done
 
#8 ·
Op. Your info is mostly wrong. A reset is mostly used to briefly clear a cel. Afterwards your car will run rich while it adjusts. Also this takes days to fully adjust. Drive it slower than normal.

Take the negative off the battery. Hold the brake 30 seconds. Your done
this is mostly wrong.

Once he resets the ECU, OP needs to drive the way he normally drives, so if he normally drives aggressively, then he should do so while the ECU relearns fuel trims. However, if OP normally drives like a grandmother, then he should continue to do that.

The ECU is going to adjust based on his driving habits. Why drive one way when the computer is learning just to drive completely different when the computer has made its adjustments?
 
#10 ·
While doing a "reset" on a good working car "may" help, it's not really needed.

The more common reasons for a reset are:

-Fixed an issue and want to start from "0" again
-Clear a CEL if you don't have a OBDII tool
-Added parts that change air, fuel, ignition (intake, exhaust, etc.)
-Checking performance mods, before & after. Reset the ECU, do a dyno pull or 0-60 run. Make changes, reset the ECU and repeat tests. Compare notes.

As mentioned, the ECU has baseline info in it, it then adjusts to your parts, the weather & your driving habits.
 
#12 ·
so the easyest way to reset the ECU is pulling two wires? Which wires?
Disconnect the battery..... either wire....... for ~15 seconds or more.