96 gsr motor running obd1. motor just went in and at first only threw code 41 (o2 sensor) cuz i don't have exhaust hooked up yet and don't have an o2. i dunno when exactly it started throwing 23 but i just know it wasn't happening when it first fired up. i think it starts throwing knock sensor after its warmed up.

anyways if anyonme could give me some things to check that would be great, i don't know how to trouble shoot knock sensors.

thanks

 

are you running a p72 ecu?

 

yes... at the moment its a jdm p72

 

up?

 

Thats a easy one to trouble shoot I would think. Reset the ecu, and check to see if it returns. Then, make sure that the wire going to the ecu is not crossed or broken, then make sure the wire is going to the correct place on the ecu, if you have a obd0-1 harness it will be labeled. If all this checks out, replace the KS itself with a known good one.
You can also refer to the steps in the service manual, but this is what I would do.

 

did you hook those 2 wires up that were loose?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HatchBox &raquo;</TD></TR><TR><TD CLASS="quote">did you hook those 2 wires up that were loose? </TD></TR></TABLE>

yes...


there are two wires coiming off the knock sensor... one goes to the ecu and one goes to ground right? one wire is thicker and is shielded...

 

did u check the voltage on those wire

 

no?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by elmalouno &raquo;</TD></TR><TR><TD CLASS="quote">

there are two wires coiming off the knock sensor... one goes to the ecu and one goes to ground right? one wire is thicker and is shielded...</TD></TR></TABLE>

I thought there was just 1, no ground.

 

going to double check right now... in the rain

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by droppedcrxsi &raquo;</TD></TR><TR><TD CLASS="quote">

I thought there was just 1, no ground.</TD></TR></TABLE>

my KS on my 95 USDM Gsr motor only has 1 wire

 

well its one one that goes into the sensor.. right outside of the sensor its spliced...the main wire continues and is shielded the other spliced wire is smaller... i guess that was the problem lol... thanks guys.... AGAIN

 

so what did you do? fixed the wiring and now the code is gone? If so

 

yes i had the smaller wire grounded for some reason... i cut and tapped that off and no more code... shes runnin nicer too