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18 Janvier 2021
The ECU 'learns' about your engine as you drive the car. The 'learning' is actually a process that the ECU uses to track thetolerance changes of the sensors and actuators on the engine. Two examples ofthese values are the position of the idle-air bypass valve (automatic choke) atidle with the A/C on, and the trim gain on the injectors. The ECU stores these'learned' values in battery backed-up RAM so that it doesn't have tostart from scratch the next time you turn your engine over.
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'Resetting the ECU' is the process of clearing all thelong term memory from the ECU's memory. These variables trim idlespeed, fuel, spark, and more. The ECU will also store trouble codes fordiagnostic capability. By resetting the ECU, the trim values will be set tosome neutral default value and all of the trouble codes will be cleared.
To 'reset' the ECU, all you have to do is remove thesource of backup power. To keep the memory alive while the car is off,the ECU has a direct line, through a fuse, that goes right to the battery. Thisis usually the same line and fuse that supplies backup power to your radio so itdoesn't forget all of its settings. In a DSM, this is the fuse that controlsthe footlights that go on when you open your car door. On a 1990-1994 DSM, thisis the 10A fuse in the lower-right-hand-corner of the fuse box near the driver'sfootwell. On a 1995+ DSM, this is the 10A fuse on the right-hand side of themiddle row of the same fuse box. Pull this fuse with the key out and wait forabout 15 seconds, then put the fuse back in. Your ECU has now lost all of itslong term memory values and will 'reset' them all to defaults when itnext powers on. By the way, the factory radio's memory lasts for a minute ortwo, so you probably will not lose your saved stations.
Sometimes people like to pull this fuse when they are working on orcleaning the interior of their car. This fuse also controls the lightsthat go on when you open the door, so many pull this fuse so they don't drainthe battery during their job. However, this will also cut backup power to theECU.
There is quite a bit of mythology revolving around resetting theECU. Many people mistakenly believe that they need to reset the ECUafter installing major engine modifications. Others believe resetting willresolve engine problems. Neither are correct.
The ECU is always tracking the engine's sensors and actuators. Resetting the ECU does not cause the ECU to learn engine changes any faster. The ECU is always tracking the gradual changes in the engine sensors andactuators. The ECU never gets satisfied with a setting, and is always updatingthe trim values. It will discover whatever change you made to your engine andmake the appropriate changes. In fact, unplugging the ECU will most likelyincrease the learning curve of the new part.
On a DSM, there are only two reasons why you would want to resetyour ECU. One is to clear a CHECK ENGINE light or error code afterfixing the problem that caused the error. The other is to reset the sparkadvance trim value. The advance trim controls how much the timing is retardedfrom what the factory engineers considered optimum. This particular trim valueis the only one the ECU 'resets' to a non-neutral MAX value. If youare driving on low grade gas, the pinging picked up by the knock sensor causesthis trim value to be lowered, and your timing to be retarded. If you go to thetrack and put good gas in the tank, you might not want to wait for the ECU tolearn about the new gas and advance the timing. So resetting the ECU in thiscase makes sense. However, in the process, you will lose your idle and fueltrims (probably not too important for drag racing, though).
Won't clearing the trouble codes make the car run better? On a DSM, no. If the ECU notices a problem with a sensor, it will flag a codeand possibly turn on the CHECK ENGINE light. Should the problem go away, theECU will turn off the light and start using the sensor as normal once again. The code will be stored inside for later diagnostic retrieval. But that codebeing stored does not affect the ECU operation in any way.
I reset the ECU, and now the car runs rough! Why? Theengine may run rough or idle poorly right after ECU reset. The ECU now hasdefault numbers in its trim memory - it has to adjust them to match the tune ofyour engine and its sensors and actuators. It might take a day or two ofdriving in traffic before the engine will settle down again. Now you know whythe ECU remembers these values in the first place! Cardhop 1 0 7 – manage your contacts using.
Do you have a question about engine computers? Iina 1 0 6 mm. Go ahead andask it!
https://torrent-bath.mystrikingly.com/blog/www-mactools-com. ©1999 TechnoMotive
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