Reset Ecu

[TUFF_350]

Hey guys,

did a bit of a search but came up empty. Google turned up this:

ECU Resetting Procedures

Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON. A stop watch or an analog clock with a second’s needle will be useful.

Operations Procedures

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.

2. 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.

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.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.

Edit: Added the "Easy Method" for ECU Reset

The Easy Method:

After experimenting with different timing, and reading posts by other members, I've come up with a condensed method of doing this reset. This method works EVERY time, even w/o a stopwatch. I've used this method successfully a dozen times, or so, now w/o a watch. After a few times, you won't need a watch or instructions. You'll get so darn good at it, you'll find yourself doing it while waiting at a traffic light.

Timing is not as critical with this method...no stop watch needed. Just count in your head...one-one thousand, two-one thousand, etc, or use stop watch. The most critical step is step #3....wait 10 sec, instead of 7.

1. Ignition "ON", count to 3.

2. Depress/Release pedal 5 times...hard and fast.

3. Count to 10 (not 7!) and fully depress pedal

4. Count to 12 (SES should be blinking), release pedal

5. Count to 10, depress pedal

6. Count to 10, release pedal.

7. Turn off ignition, then start engine. Done!

Will disconnecting the battery be an even easier option? Or does anyone have another procedure lol? Thanks.

[iamhe77]

1. Ignition "ON", count to 3.

2. Depress/Release pedal 5 times...hard and fast.

3. Count to 10 (not 7!) and fully depress pedal

4. Count to 12 (SES should be blinking), release pedal

5. Count to 10, depress pedal

6. Count to 10, release pedal.

7. Turn off ignition, then start engine. Done!

Will disconnecting the battery be an even easier option? Or does anyone have another procedure lol? Thanks.

Disconnecting battery doesn't seem to work... unless you leave it off for a few days I guess.

That procedure is the same as our M35 Stagea's

Just a quick note, Step 4 above is where the ECU displays any error codes so perhaps it would be a good idea to write them down before moving on to step 5.

Also, I compiled a (long) list of error codes that are applicable to V35, M35 etc for future reference.

Edited October 5, 2010 by iamhe77

[V35_Paul]

Disconnect the battery and pump the brake peddle 5 times.

[TUFF_350]

Sweet,

thanks for that buddy sounds easy enough.

[GeNOS]

what reason would one have to need to reset the ECU??

[diabolique]

what reason would one have to need to reset the ECU??

Mainly when U get new mechanical mods, for example things like resetting the knock sensor so the ignition timing is accurate after you've added say a throttle-body spacer, resetting the O2 sensor if you've installed HFC or even something as minor as a Z-tube. IMO Any kind of mod to the intake/exhaust and engine (i.e. bigger injectors) will require an ECU reset. In doing that, the ECU 'learns' your driving style and makes any necessary adjustments. Also, if you want to clear any error codes (e.g. airbag light flashing) an ECU reset does the job.

P.S: I've even heard of people resetting the ECU after an Oil change. I don't, however, I don't have any arguments against it so I won't go into it.

[samuri]

Mainly when U get new mechanical mods, for example things like resetting the knock sensor so the ignition timing is accurate after you've added say a throttle-body spacer, resetting the O2 sensor if you've installed HFC or even something as minor as a Z-tube. IMO Any kind of mod to the intake/exhaust and engine (i.e. bigger injectors) will require an ECU reset. In doing that, the ECU 'learns' your driving style and makes any necessary adjustments. Also, if you want to clear any error codes (e.g. airbag light flashing) an ECU reset does the job.

P.S: I've even heard of people resetting the ECU after an Oil change. I don't, however, I don't have any arguments against it so I won't go into it.

How does the ECU learn?

Is it through time spent at different speeds, average speeds, and rates of acceleration or what? Is it always adjusting and if so why would a reset be necessary?

My LPG Emer sequential vapour injection system was recently installed.

These systems piggyback off the ECU I believe and learn how to operate on LPG based on the ECU.

I am thinking of resetting the ECU as I believe my LPG system should be getting better mileage. However as I am in a remote area I am concerned I may somehow stuff up the motor with no assistance within a few hours drive. Currently 6km / litre on LPG everything else seems fine, easy to start ,good acceleration high speed overtaking no problem.

Before the conversion I was getting around 7km to 9km a litre on petrol dending on speed and driving style. I should be getting only 10 % to 15% worse but I have been told it could be as little as 5 %.

Straight after conversion I drove 2500km on the highway in 2 days. I can’t return to the installer until next year.

Vehicle - 1996 non turbo automatic skyline GTS

Any thoughts as to poor LPG fuel consumption immediately after conversion.

i havent run on petrol since conversion as it is a $1-60 a litre on average

[samuri]

Disconnect the battery and pump the brake peddle 5 times.

Would the above be for all nissan vehicles or just V series motors?

How long after resetting to factory settings does the system stabilise to a new driver.

is it the time and engine is on or km driven

Under what conditions is the ECU modifying the system or does it do it continuously every second !

[Ezy03]

iv tried so many times and i still cant reset it!! anyone recommend anything?

[oje80]

I'm the same, I have done plenum spacer and inlet, and I can't get it to reset.

Can anyone help???

[V35_Paul]

Ok try the long way.

The ECU Resetting Procedures Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.

2. 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.

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.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.

[jawrgy]

how do u know if u have reset the ecu. Im interested in resetting mine as i have recently bought the car a few months ago and fuel consumption is pretty high. Will resetting the ECU help??

getting 450km per tank on a good day, 370km when i drive with a bit of a lead foot.

[V35_Paul]

how do u know if u have reset the ecu. Im interested in resetting mine as i have recently bought the car a few months ago and fuel consumption is pretty high. Will resetting the ECU help??

getting 450km per tank on a good day, 370km when i drive with a bit of a lead foot.

There is a common problem with the V35 and the fuel gauge. You might need it cleaned/replaced. when it's on the red line "E" you could have a 1/4 tank left. Maybe.

You should get 550km on a good tank.

Edited November 4, 2010 by V35_Paul

[Ezy03]

tried again....about 20 times, im getting .1-.2 seconds off wen im lapping the stopwatch to the next step and im still getting nothing...should i be trying something different or getting closer - things im thinking i might be doing wrong -

1 - the first step im doing wrong , when do i start counting the first three seconds as soon as i put on the ignition to on or wait till at check light goes off?

2 - also maybe the 5 press and let go (second step), at after the 3 seconds(1st step) is it 1 in and out per seconds or it doesnt matter because im doing it within 3-4 seconds and continuing if i finish the second step before 5 seconds say 3.5 do i wait till 5 seconds then start next step?

Edited November 4, 2010 by ezy03

[V35_Paul]

tried again....about 20 times, im getting .1-.2 seconds off wen im lapping the stopwatch to the next step and im still getting nothing...should i be trying something different or getting closer - things im thinking i might be doing wrong -

1 - the first step im doing wrong , when do i start counting the first three seconds as soon as i put on the ignition to on or wait till at check light goes off?

2 - also maybe the 5 press and let go (second step), at after the 3 seconds(1st step) is it 1 in and out per seconds or it doesnt matter because im doing it within 3-4 seconds and continuing if i finish the second step before 5 seconds say 3.5 do i wait till 5 seconds then start next step?

1. As soon as you turn it "On".

2. Doesn't matter how quick as long as it's within 5 sec. When the peddle is fully out start counting your 7 sec.

If it's not working maybe your problem can not go away with a reset.

What is the problem your having? Why do you need a reset?

[Ezy03]

installed a few mods and it said to reset it, might get my cai in next week and let the place im getting installed at do it, save me the hassle

[V35_Paul]

installed a few mods and it said to reset it, might get my cai in next week and let the place im getting installed at do it, save me the hassle

You don't need to reset it. You can just drive the car around and the ECU will adjust it's self to the new mods. A few hours of driving will do it.

[rorii]

Cant you turn the car to on and discsonnect the negative terminal of the battery and pump the brakes a few times?

[zei20l]

i think its only been said a 100 times that this doesnt work on the V and M chassis nissans. Probably anything else made after 2000/2001

[ziadov999221177]

If I leave the battery disconnected for the whole night will do the job of resetting the ECU?

My car v35 coupe it's not starting completely, everything works fine a part than starting ON.!!!

Helppppp...!!!