reset my ECU and turn the engine check light off successfully! - Nissan Forum
GA16DE 1.6L Engine Engine Discussion: 91-99 Sentra, 95-98 200SX, 91-93 NX1600

 
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#1 Old Jun 7th, 2004, 06:14 PM
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reset my ECU and turn the engine check light off successfully!

Hi all,

I did reset the ECU on my 97 sentra gxe lst weekend. I am writing this to share my experience.

The engine check light came on after I start my engine without connecting the mass airflow sensor. It didn't go off even I reconnect the mass airflow sensor. I think it generated an error in ECU.

The solution is reset the ECU. Here is the right method.
http://www.sentra.net/tech/ecu.php?
It is a good article. The only thing that I want to mention here is that you need to do the screw method twice in a row to reset your ECU.

1.With the engine off, turn the ignition to the ON setting.
2. Turn the diagnostic mode selector on the back of the ECU fully clockwise.
3. Wait two seconds and turn the mode selector fully counter clockwise.
4. Turn the diagnostic mode selector on the back of the ECU fully clockwise.
5. Wait two seconds and turn the mode selector fully counter clockwise.
DO NOT turn on your engine between step 3 and step 4. That is the trick.

Btw, on my car, the disconnecting battery method didn't work well. I disconnected it for 4 to 5 hours while it didn't reset my ECU.

Hope this will help you. Thank you!

archer98
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#2 Old Jun 7th, 2004, 06:18 PM
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now you know why searching is preached?

btw, between the first and second time you turn the screw fully ccw, you can look up at your dash and get the flashing code to find what caused the CEL to come on.

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#3 Old Oct 31st, 2005, 08:37 PM
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This post was very beneficial for me! I was able to clear my codes easily. Thanks!
#4 Old Oct 31st, 2005, 08:41 PM
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just so you know, if the problems aren't fixed and you just reset the ECU, be prepared for it to come back at you full force.

However, once a problem is fixed, the ECU will turn of the Check Engine Light after 3 times the car has been started and the ECU doesn't see the error.

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#5 Old Nov 1st, 2005, 07:00 AM
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Yea, I was reading about that as well. I was pretty sure these were just caused from me removing the distributor and turning it over while harness was removed.

I've started the car about 5 times now...I went for 2 10-15 minute trips and another 35 minute one this morning. The light has stayed off. Am I same to assume there are no codes there now?
#6 Old Nov 1st, 2005, 09:47 AM
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Quote:
Originally Posted by wheels_99
Yea, I was reading about that as well. I was pretty sure these were just caused from me removing the distributor and turning it over while harness was removed.

I've started the car about 5 times now...I went for 2 10-15 minute trips and another 35 minute one this morning. The light has stayed off. Am I same to assume there are no codes there now?
More than likely. Honestly what you did should not cause that sensor to go bad, unless it just went bad at that time by coincidence. I would drive it as normal and just keep an eye out for a CEL. Now you can at least pul and check the codes yourself if you get one.

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#7 Old Nov 1st, 2005, 12:09 PM
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disconnecting the battery really isn't the way to go about it. I've heard that it had to be done for 24 hours, but even still, ECUs have capacitors and programmable memory that can retain the information indefinitely without power. it's the exact same thing as taking the battery out of your cell phone, and a few days later, you power it back up and nothing in the memory was wiped. the old battery trick might work on older cars but on these, where emissions is more of a concern, you're wasting your time.

like they said above, it can be done at the ECU, or if you have OBDII, you can use a scan tool.

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#8 Old Dec 29th, 2006, 08:14 PM
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YES

YES...VERY USEFUL...you are the man. I shall now reset my ecu

....the story continues
#9 Old Dec 29th, 2006, 10:08 PM
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RESETY AT WILL

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#10 Old Jul 11th, 2007, 07:27 PM
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Where is this ECU located? i checked behind the fuse panel in the interior and behind the center console but still cant locate it
#11 Old Jul 11th, 2007, 10:31 PM
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Quote:
Originally Posted by Exalta
Where is this ECU located? i checked behind the fuse panel in the interior and behind the center console but still cant locate it
it's on the floor under the dash, in the middle of the car, and directly behind the center console.


as for clearing the ECU with the battery...it does work depending on the car. The CEL was on in my 2000 corolla, I fixed the problem and unplugged the battery for 15 minutes and the CEL went out.

Unfortunately, the corolla doesn't have any way to pull the error codes manually like the sentra, so this is really the only option.

the battery thing did not work for my sentra either, i had to the manual reset...but I looked at the code first to make sure i actually fixed what it wanted.

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#12 Old Jul 12th, 2007, 07:45 AM
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Quote:
Originally Posted by Tavel
it's on the floor under the dash, in the middle of the car, and directly behind the center console.


as for clearing the ECU with the battery...it does work depending on the car. The CEL was on in my 2000 corolla, I fixed the problem and unplugged the battery for 15 minutes and the CEL went out.

Unfortunately, the corolla doesn't have any way to pull the error codes manually like the sentra, so this is really the only option.

the battery thing did not work for my Sentra either, i had to the manual reset...but I looked at the code first to make sure i actually fixed what it wanted.
disconnecting the battery worked on my Sentra, done it twice.
I also fixed an EGR problem ( replaced the little hose) and it took 15 days to go off by itself, car is driven daily for 11 miles each way.

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#13 Old Jul 12th, 2007, 04:54 PM
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clearing the codes does not solve anything if you actually DO have a faulty sensor or something.
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