www.gt4dc.co.uk
Maintain, Modify and DRIVE your GT-Four


It is currently Mon Jul 22, 2019 7:11 pm




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: rewireing knock sensor
PostPosted: Sun Mar 03, 2019 2:34 pm 
Offline
New Poster

Joined: Wed Apr 05, 2006 12:47 pm
Posts: 30
Location: south wales
Car Model: None
looking at replacing the knock sensor wire on my 205 and need some advise
on what should be done as there doesn't seem to be much information on it, only replacing the sensor

basically its a shielded wire from the ecu to the sensor (what type is needed for this)? rg85 a/u?
I know it has to be soldered onto the KNK pin coming out of the ecu, with the other end
to the sensor, 1 to the sensor and the other to ground in the engine bay, anybody actually done this
who can help or advise


Top
 Profile  
 
PostPosted: Wed Mar 06, 2019 12:06 pm 
Offline
New Poster

Joined: Wed Apr 05, 2006 12:47 pm
Posts: 30
Location: south wales
Car Model: None
anyone at all?


Top
 Profile  
 
PostPosted: Wed Mar 27, 2019 8:50 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3623
Location: Bournemouth
Car Model: None
Failure of wire is extremely rare, unless it's had physical damage - melting, chafing over an edge or squashing. The usual reason for a failed wire being diagnosed is when people don't realise it's a screened cable and including the screen in the signal connection.

It should be wired with the inner core connected to ECU at one end and knock sensor at the other. The screen should be connected to Earth at the ECU end and cut short & insulated at the knock sensor end.

If the original cable has been mis-wired at the knock sensor end, then it should be recoverable by cutting it then re-making correctly, extending the inner core if needed by soldering & sleeving a new single core wire to the sensor.

To strip a screened wire, gently slice the outer insulation with a knife and cut off. The screen strands can then be pulled to one side to reveal the inner wire which can then be stripped as a normal wire. For the knock sensor end, just cut off the screen strands and ideally sleeve over so they can't touch anything.

To test the original, check for short circuit between screen and core, and check continuity of the core from ECU to sensor. If these are ok then there should be no need to run a new one.

If you do run a new one, try to avoid running it near the ignition coil or leads.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group