[Supras] Two knock sensors or one?

[Patrick Golder]

It's been 12 years since I did this, but IIRC, code 52 is usually caused by a bad wire to the knock sensor.  It's a coax cable that develops an internal short.  The fix is to run a new coax wire between the knock sensor and ECU.  Here's a couple of links from www.supras.com:
   
  http://supras.com/06/techcenter/display.php?QID=51
   
  http://supras.com/06/techcenter/display.php?QID=69
   
  Patrick
   
  Hi to all,

We're trying to get my son's 1990 Supra to pass state emissions. It has a code 52 for knock and (I am assuming) high HC levels due to spark retard. This is a non-turbo car. There is some debate as to whether there is a second knock sensor behind the starter. I can't even see a wire going that way, never mind a sensor. I really don't want to take the starter off, only to find there is none! Any suggestions? Thanks for your help!

Bill

Perhaps refer to service manual at:

http://www.cygnusx1.net/supra/library/TSRM/


 
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