Code went away, man that sucker was hard to get out... jesus... infact I broke 4 of them at the junkyard just taking them off... lol... I didn't want to get a junkyard one, cause I heard they go every 5 years, but I just wanted to see if this will fix anything before I blow $80.

Anyway, my SES light went off after I installed it from a 99 maxima, And that one sucked to get out because I guess the 99s autos had some kind of vacuum actuator pump right in front of that hole that the knock sensor goes in... Well NEways... my question...

How long does it take the ECU to fully re-learn everything to stock maps? Cause Motorvate says wen the knock sensor fails it tries to protect the engine by putting in like diagnostic curved maps by retarding engine timing. HE also said, low end power will be amazing better. So far I noticed it was a little smoother but not too sure if it really did help my low end power as much as ppl say, cause it feels pretty much the same. And yes, I started using Premium gas again.

And last question, should I reset my ECU instead of waiting? Cause I have a feeling that the SES light will come back sometime because the code was still there but the light was off, and I cleared the PO325 code. And no codes were found.

 

If you have replaced the knock sensor, then defenitly reset your ECU. Once that is complete, you should have full power almost immediately.

 

reset the ecu

 

ok, if I do this, will I have any issues with anything? I never done it before and I don't want something to get all cooky from resetting... lol

 

no nothing bad will happen from resetting your ecu. but it will take your engine about 50 miles (from my experience) to relearn everything. it wont be immediately like mentioned.

 

^ yah thats what I was talking about... I didnt want my car to be crappy at idle or pickup if I reset... Well thanks guys

 

Don't worry, you won't have a crappy idle etc if you reset the ECU. It just take some mileage/drive cycles for the car to reach it's optimum settings. Not a big deal.

 

shudnt be a big prob.Just put it in, reset code, light should go away and then you should be fine.I have a 99 cali and hoping that i wont have to change it out anyday soo,cause it sounds and looks like a pain in the ***.

 

o btw, I didnt reset the ECU yet, but the car is now somewhat diesaling... and it pisseing me off because after I turn the car off it i hear and feel a little shake like the engine is going 2 more revs... I hope that this is not causing hot spots or anything bad... Should I just reset the ECU now? I still think I am getting bad mpg... I just put in 20 the other day which is 4 gallions exact over here and I got just barely 100miles out of it. And if this is a 16 gallion tank or 18.50(acording to MSN)?... Your telling me it will be $70-80 to fill a 16 gallion tank? Can't be...

This is the best way I can get MPG, but aprox it is saying with my math. 25MPG... Which is impossible...

 

i reset my ecu after anytime i work on my car for a sensor related issue.

 

how is 25mpg impossible? thats pretty standard for a good running max. Also why are you so afraid to reset the ECU, everyone is telling you to do it and there will be no problems. I probably reset my ECU atleast once a month since I work on my car quite a bit.

 

Dont reset it! You'll throw more codes and kill your O2 sensors.

 

I am not affaird to reset it... lol, I just wanted to drive at least 50miles with this new knock sensor first before I did that... And I just don't get why my car is diesaling a little.

And 25mpg is impossible because it goes really really fast... lol, and my calipers are are putting on more resistence then they should, and my EGR tube is clogged but it has not thrown a code in a long time.

 

what the hell is diesaling?

 

^its when the car pretty much doesn't quite shutoff right away when you turn it off and it will go like 1-2 more full revolutions. This can happen from hot spots in the engine, bad carbon deposits or leaky injectors. Basically once my spark and injectors stop the engine kinda shakes a little after I turn it off. Its annoying because I am a perfectionist with how and engine performs. IT really is not that bad as some other peoples cars or a car that is actually a diesel engine but I just hate it. lol

 

I just replaced my knock sensor and reseted the ECU. Now I have the code showing up again. that is the only code I have coming up. What do I do now?

 

Check the continuity of the harness and clean the KS ground area on the upper intake manifold.

Ground point is here:

 

Agreed. Start there, then report back.

 

I have done both, but i will do it again today and see what happens. Thank you!

 

are you using the same gas station or you change them. I get the KS code when I change stations. Man..... the worts was when I drove from AR to UT. I tried to always stop at a Chevron or Texaco but when there wasn't one I used what ever there was and code was there for a while

 

Did you change out the harness when you changed the knock sensor?

 

I cleaned up the KS ground area again yesterday and checked the continuity of the harness. Would the code go away on its own after I drive for a while or do I have to delete it myself?

 

I use Chevron mainly, but lately I have been using Sam's club gas station. It is just cheaper there, but I always put Premium.

 

I did not change the harness, but I checked it and it was fine!
I checked the resistance of the KS and it was about 550 Kohms. And from what I have read so far this is a great resistance for the KS.

 

Here is what I did after I changed my KS. I went to autozone and asked if they could clear the codes. They wouldn't do it saying that they weren't allowed to. I went to different autoparts shops asking if they could check the codes until I reached an advanced auto parts store and they just gave me the machine to use to check my codes. I went out there and cleared the codes without telling them, gave them back the machine. The KS code never showed up again. Give that a shot. After about three days I noticed an increase in low end power. It's not as big of a difference as some people let on but I did see an increase.

 

I replaced my battery cords and I had the battery out of the car for 5-6 hours, so I believe that the ECU was reset and the code should have been erased. But now it comes up again.

 

if im right i believe it take 11-12hrs to clear ECU that way.

 

I thought its like 10-15 min

 

why did you sell the Maxima dude??? and don't say MPG

 

im sure its not 10-15min. i remember trying to clear my ECU the battery way for 8hrs and it didnt clear. had to leave it 11+hrs to do it that way.

 

Holy s***. I will not be able to find someone to clear my codes in Autozone or some other part store. I have tried and they say No. I guess I will have to take off the minus cord of the battery and let it stay a day. Is there a way I can erase the codes through the ECU it self?

 

Yeah, all you need is a flathead screwdriver and it will take you 30 seconds. See the bottom of the page:

http://vbxmaxima.8m.com/ecu.html

 

I got flat-head screwdriver and I am sure I can find 30 sec. Thank you. I will try it today and report back!

 

I used a flat screw driver and erased the code. Then I checked to make sure there is no codes. Now I plan on driving 75-100 miles and check the codes again. Hope the code does not come up again!

 

As I remember, I did have to clear the code after installing the KS. I also carefully cleaned up the ground contact as mentioned in previous replies.
The code was not going away until I cleared it. Since then (6 months now), it seems working fine (no KS code returning).

Good luck.

 

I have done everything that has been posted on the thread including cleaning the ground of the KS. Now I just want to do some driving before I check for the code again. But I hope that it will not show-up

 

How can I reset the ETU

 

Scratch that Its already explained in this post. Thanks for having an answer before I even had a question.

 

ya this car took the longest of any vehicle to finish its diagnostics

aproxamately 70 miles from when i reset the codes.

the next day apx 15 miles with in town driving.