I ordered a new KS from Jim Rome Nissan and I installed it using the skippynet/motervate method (:30 minutes). The car felt about the same after the new KS was installed, so I reset the ecu. A couple days later I went to Autozone to see if the code went away, and once again, I got 0304. I checked all the connections in the harness... seemed good to me. Then I tested the KS with my ohm meter, and the numbers that I was getting were all over the place... it reads as thought there is an open circuit.

So, my question is, what did I do wrong, or was the KS bad out of the box?

thanks! belosic

 

check harnees to some people have theirs bad

 

Did you reset the ECU to clear the code after you replaced the knock sensor? In some cases, the ECU will clear an existing code if the problem is not detected (but it takes X number of starts/cycles before that happens). The correct procedure is to reset the ECU after the faulty component is replaced.

If you did do this, and the code actually "reposted" then there is still a problem. From your post, it seems as though you already checked the harness - but it would be worthwhile to go over it again more thoroughly...

 

I reset the ECU after I replaced the KS, after a couple days I got the code again, I checked everything (harness, connections), and reset the ECU again.... still getting the code. I'll check the harness for continuity... I hope I don't have to buy another sensor! Are they fragile or something? I never dropped it or anything, I'm curious if it could've been damaged in shipping, or it may be a dud.

 

Call Jim Rome Nissan and see if they are willing to ship you a replacement sensor - the part should be warranteed.... better yet, if the part does not test correct, you should be able to walk into a local Nissan dealer with your original invoice for the part, and the defective part and they should be able to give you another one under warranty.

 

The sensor is showing 200 - 300kohms... obviously out of factory spec. I guess I'll call Jim Rome Nissan and see if they'll replace it, I just don't understand how it could be broken already.

 

I just got off the phone with Jerry Rome Nissan (looks like I've been calling them "Jim" Rome.. whoops), and the parts guy said he "was hesitant to exchange the part, as there are other things that can cause the 0304 code." Any ideas as to what those things could be? 0304 is the only code I'm getting, and the part isn't producing factory-spec output. I guess I'll try the local stealership next.

belosic

 

Same thing happened to me...however it took about 4 days for the 0304 to go away.

 

Did you over tighten the bolt?

 

Bought a new harness from Nissan ($18), still getting the code. They also put thier ohm meter to the KS, and they said it was in factory spec. I guess I'll just wait a few days and hope for the code to go away. I went to radio shack and bought a 470k ohm resistor and plugged it into the harness, and I got code 0505 (everything is ok), so at least I know the harness is good!

 

Did you not read my post?


Also are you using premium?

 

Whoops, sorry, yes I saw your post. I torqued the bolt to 22 lbs/ft (spec?) I am also using premium fuel (91). Will overtightening kill the KS?

 

The factory spec is 15-20 foot-lbs


Loosen to 15. Drive the car for 15 min. Reset the ECU. Drive for another 15 min and see if the code is still there.

If you overtighten, it will cause the KS to overdectect knocks thus slowing hte timing down.

 

If the KS was overtightened once chances are you might have cracked the case making it more sensitive.

 

I don't think I ever overtightened it, but I did loosen it to 15lbs. There isn't any cracking in the housing...unless there is something internal that I can't see. If I get code 0505 with the resistor, and 0304 with the new KS, then it looks like the new KS is bad, right?

 

I guess so.