Jump to content
SAU Community
  • Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register

Knock sensor harness location/access?

Recommended Posts

Hello everyone.

I purchased a highly modified '98 r34 gtt this past February and have run into something completely unfamiliar... Wiring harnesses.


Purchased a new gtx3071r and after a few e-tuning pulls my knock stopped registering completely. Upon inspection one of my knock sensor connectors was cracked and fully disconnected.

I purchased a new knock sensor sub harness and am going to be tackling it this weekend and need a bit of guidance;


1) I have a intake plenum so accessibility to the knock sensors/wiring is nearly impossible, is it easier to go from the top and start removing the entire plenum or go from underneath?

2) Whereabouts should I expect amongst my main harness to find the connection for the knock sub harness? Would help if I knew a ballpark even mid engine'ish.

Any info whatsoever would be greatly appreciated. I've done lots of research and there seems to be very minimal info around the knock sensors & their harnesses for the rb25. I had a modified evo prior but unfortunately wiring & skylines are an entirely new world to me.


Thank you so much and have an amazing day!


- @ThePurpR34

Edited by Thepurpr34
Link to comment
Share on other sites

if it's anything like the r33 gtst - which it probably is - go in from the bottom, remove starter motor, and you will have plenty of room to get the rear plug. I only replaced the plugs, didn't pull apart the harness, but I believe the KNK sensors and fast idle are on their own loom, just taped together with the gearbox/alternator loom, so you either need to remove it as a whole, or try cut it apart with on car - removed the whole thing, and will almost certainly be easier for you.

The joined harness assembly will possibly be connected to the 3x gearbox connections, the alternator, the enginebay fusebox x2 points, the fast-idle, and knock sensors.....or possibly it will have other points too, can't remember, but that's the starting point.

When refitting the starter, ditch the top bolt and put a stud/nut in there instead - alot easier to get the starter on/off in future. 

  • Thanks 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Latest Posts

    • The price of gtrs has just gone completely stupid. Are they worth it? Hell no. Bout 7-8 years ago R34s went down to $38k, r32s on this site could be had for $9k-$12k and people were shit talking them by saying they wouldn’t tough one at those prices coz of the work needed  I had a r33 gtr. it was good value for money at the time  if I had $200- $400k to spend on a car, I sure as shit would not be buying a gtr 
    • Don't know about this one. Though I spent a lot of time looking at cars that I couldn't buy. This worked for me:   1) Make account on carsales 2) Search for the car you are after, eg. R34 GTRs 3) Save the search and tick the box for notifications 4) Receive email / notification every time a car is listed 5) Save the car by clicking the heart button 6) Go through your saved cars periodically and see which ones stay listed for ages, which ones go down in price and which ones are gone in no time   I haven't looked at GTRs, but I noticed a good bargain won't last a week, sometimes not even a weekend. You won't see those if you only search occasionally. The ones that ask for too much don't sell and stick around forever.
    • IMO anything less than this isn't worth it
    • Contact East Coast Customs they have been working on them for a while and know their way around them https://www.facebook.com/eccustoms
    • The car has been around for awhile now and is popular. So a good portion of mechanics have probably worked on them.  I just did a google search of "Brisbane import mechanic" a few popped up
  • Create New...