Resetting ECU (02-03)
#1
Resetting ECU (02-03)
I have read that the maxima ECU is adaptive in that it changes according to driving styles. I have also read that there are a few ways to reset it. Some say you can disconnect the terminal going to the positive battery post for 1/2hour. Others say it must be disconnected overnight. I also read that it can be done using the procedure below. Some say the procedure below only resets part of the ECU ut not timing and some other things. Does anybody know what must actually be done to reset the ECU?
One procedure:
How to reset ECU in 5th and 6th Generation Maxima's
1. Turn ignition switch on and wait about 3 seconds.
Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. (here is where i think you can get a code from this.)
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
Also, I have read that it takes 400-500 miles of driving for the ECU to complete readapting. If I drive heavy on the throttle during that time then what different signals does the ECU send? Does it adjust the timing, fuel, etc from that point forward?
One procedure:
How to reset ECU in 5th and 6th Generation Maxima's
1. Turn ignition switch on and wait about 3 seconds.
Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. (here is where i think you can get a code from this.)
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
Also, I have read that it takes 400-500 miles of driving for the ECU to complete readapting. If I drive heavy on the throttle during that time then what different signals does the ECU send? Does it adjust the timing, fuel, etc from that point forward?
Last edited by NmexMAX; 03-17-2011 at 06:11 AM.
#2
for 2000 its simply disconnecting the battery, you dont need to keep it overnight, i keep it off for no more than thirty minutes. you know when its reset if you have a cd in the radio and it pops out.
for 2002+ its that process listed above.
400 miles is a little much, i believe its just a couple miles..
for 2002+ its that process listed above.
400 miles is a little much, i believe its just a couple miles..
#3
First things first - help the little guy out by running the engine at idle (if not already, warm up the engine to normal temp) for a while. The ECU can learn quite a bit from this stage since the RPMs aren't bouncing around precariously. Then go for some normal driving a few miles and let it adapt to the condition of your coil packs, plugs, O2 sensors, etc.
#7
I have read that the maxima ECU is adaptive in that it changes according to driving styles. I have also read that there are a few ways to reset it. Some say you can disconnect the terminal going to the positive battery post for 1/2hour. Others say it must be disconnected overnight. I also read that it can be done using the procedure below. Some say the procedure below only resets part of the ECU ut not timing and some other things. Does anybody know what must actually be done to reset the ECU?
One procedure:
How to reset ECU in 5th and 6th Generation Maxima's
1. Turn ignition switch on and wait about 3 seconds.
Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. (here is where i think you can get a code from this.)
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
Also, I have read that it takes 400-500 miles of driving for the ECU to complete readapting. If I drive heavy on the throttle during that time then what different signals does the ECU send? Does it adjust the timing, fuel, etc from that point forward?
One procedure:
How to reset ECU in 5th and 6th Generation Maxima's
1. Turn ignition switch on and wait about 3 seconds.
Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. (here is where i think you can get a code from this.)
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
Also, I have read that it takes 400-500 miles of driving for the ECU to complete readapting. If I drive heavy on the throttle during that time then what different signals does the ECU send? Does it adjust the timing, fuel, etc from that point forward?
I just installed an intake in my car and wanted to reset the ecu, but not sure if I'm doing it right...I followed the procedure listed above but I am unable to see the CEL light come on or blink during the procedure...any ideas???....do I even need to reset the ecu with an intake install???
#11
Reprogram after new MAF install?
I just bought a new MAF for my 2000 Maxima and I am going to install it myself, but I was told I need to take it to the dealership to get reprogrammed? Does the ECU just need to be reset? Is this something I can do myself or do I actually need to take it to the dealership?
Thanks
Thanks
#12
Resetting and reprogramming are two different things. Yes you have to reset the ECU. No you don't have to have the ECU reprogrammed or at least thats the general consensus. I drove around my max for two years after changing the maf without reprogramming with no problems. I had to get it done in the end for something else. Anyway, when you replace your maf you have to disconnect the battery. By the time your done, the ECU will have reset so you don't have much choice.
#13
I just installed an intake in my car and wanted to reset the ecu, but not sure if I'm doing it right...I followed the procedure listed above but I am unable to see the CEL light come on or blink during the procedure...any ideas???....do I even need to reset the ecu with an intake install???
#15
mine went away after more miles then that and when i fired mine back up it came right back up like it was always there... but once it went away, never came back up..
im bout to get a custom cold air intake... that should be fun for the sensors =D
im bout to get a custom cold air intake... that should be fun for the sensors =D
Last edited by babyboyws6; 03-09-2008 at 09:01 PM. Reason: typo.. dummy me
#16
I just installed an intake in my car and wanted to reset the ecu, but not sure if I'm doing it right...I followed the procedure listed above but I am unable to see the CEL light come on or blink during the procedure...any ideas???....do I even need to reset the ecu with an intake install???
#20
reprogram (reflash) - there is a problem with the default software values. Nissan will have new software that needs to be loaded to correct the problem. (think - installing new drivers)
#21
reset - you set software values back to default factory settings so that the ECU can "relearn" a new mod such as an intake. (think - rolling back drivers)
reprogram (reflash) - there is a problem with the default software values. Nissan will have new software that needs to be loaded to correct the problem. (think - installing new drivers)
reprogram (reflash) - there is a problem with the default software values. Nissan will have new software that needs to be loaded to correct the problem. (think - installing new drivers)
So in my case that I changed the TB, ECM and maybe I add the MAF should I do a nice reflash of ECM. I got the ECM from junkyard and not sure how old that is.
Also is there any way we can do the reflash ourselves or anyone beside dealer (stealer)?
#23
The reseting we did ourselves I am trying to figure out if it is worth it to do the reflash. since my car is still idleing on 1700rpm
#25
Easiest way is to make sure the engine is a full operating temperture. Turn off, disconnect the negative terminal from the battery. Step on the brake pedal, hold it down and then turn on the headlights about 10 seconds. That will clear out any remaining charge in the system.
I haven't noticed much difference in my car resetting the ECU but I noticed a huge difference when I had my 626 since the previous owner drove it so conservatively.
I haven't noticed much difference in my car resetting the ECU but I noticed a huge difference when I had my 626 since the previous owner drove it so conservatively.
#27
Please confirm - it is not clear - does the procedure displayed below reset also 5th generation Maxima (2001)?
I don't have an OBD scanner, but I know now the system does not show up any codes, can this good situation change after reset?
WHere is the CEL lamp that should blink in Maxima 2001?
I don't have an OBD scanner, but I know now the system does not show up any codes, can this good situation change after reset?
WHere is the CEL lamp that should blink in Maxima 2001?
Last edited by NmexMAX; 03-17-2011 at 06:10 AM.
#28
And if you are referring to the one this thread is about the answer is no.
#33
Sorry to bump this thread. My 2003 maxima threw a cel code p0128 yesterday on my way t work.i have tried to search but didnt really come up on anything. My question is ,could it still be the thermostat if my car is not heating up???
Also checked coolant and it is fine. Was trying to reset ecu using this procedure but its not working for me.tia
Also checked coolant and it is fine. Was trying to reset ecu using this procedure but its not working for me.tia
#34
#35
Sorry to bump this thread. My 2003 maxima threw a cel code p0128 yesterday on my way t work.i have tried to search but didnt really come up on anything. My question is ,could it still be the thermostat if my car is not heating up???
Also checked coolant and it is fine. Was trying to reset ecu using this procedure but its not working for me.tia
Also checked coolant and it is fine. Was trying to reset ecu using this procedure but its not working for me.tia
#36
What i ment to say is its not getting above normal operating temp.i reset the ecu and the cel hasnt came back, granted ive only drove it more den 5miles.also the fans are turning on once it gets to normal temp as usual. And now that i think of it coolant was a little low and i topped it off .should i keep driving it to see if the code comes back?
#37
How do you know it's not getting to normal opaerting temp?
Those are short distances and if you're in a fairly chilly climate, you wont reach operating temp.
Takes my car a good while to get there.
Also, the fans don't run on when you reach operating temp, they turn on (1 or both, high or low) when certain conditions have been met, and one of those conditions is not operating temp.
Operating temp is also a fairly loose term.
Those are short distances and if you're in a fairly chilly climate, you wont reach operating temp.
Takes my car a good while to get there.
Also, the fans don't run on when you reach operating temp, they turn on (1 or both, high or low) when certain conditions have been met, and one of those conditions is not operating temp.
Operating temp is also a fairly loose term.
#38
Okay car doesnt overheat.fans turn on which means thermostat is opening up right??also if it was the ect sensor wouldnt the fans not turn on??i might be wrong ,just trying to see if anyone else has gone thru this problem before?..
Im going to drive the car to work today to see if the cel comes back on .
Im going to drive the car to work today to see if the cel comes back on .
#39
Okay car doesnt overheat.fans turn on which means thermostat is opening up right??also if it was the ect sensor wouldnt the fans not turn on??i might be wrong ,just trying to see if anyone else has gone thru this problem before?..
Im going to drive the car to work today to see if the cel comes back on .
Im going to drive the car to work today to see if the cel comes back on .