Blue02GPGT Posted April 10, 2022 Report Share Posted April 10, 2022 Hello all. Hope I'm in the right place for this. I have a 2002 Grand Prix GT 3800. P0332 (rear knock sensor low output) set. No driveability issues expect occasional rough idle at start up. Previous owner said she replaced "the" knock sensor, don't know which one, or if she really did. Got a look at it today, someone has replaced the pigtail harness at some point. I have a new sensor and harness, but before I replace it (it looks like a bitch to do) I want to check continuity of the wire between pcm and sensor, possibly run a new wire if needed. does anyone have excess to a pin out diagram of the pcm? like which pin on which connector is knock sensor 2 at the pcm? Im not having luck finding it. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted April 10, 2022 Report Share Posted April 10, 2022 Looks like on your car it would be the C1 - Blue Connector, Pin 34 for Knock Sensor #2 (For reference Pin 33 is Knock Sensor #1, but you'd have code P0327 if that was the case) For the rear knock sensor look out it has a short Sub-harness that I've seen get smashed in engine swaps. so verify the integrity as well as connection to the main harness upstream Quote Link to comment Share on other sites More sharing options...
55trucker Posted April 10, 2022 Report Share Posted April 10, 2022 Go purchase this & you'll have what you need to aid you in your diagnosing of the issue. https://www.ebay.com/itm/303838857720?hash=item46be3509f8:g:G8oAAOSwrg9f9wcc Quote Link to comment Share on other sites More sharing options...
Blue02GPGT Posted April 10, 2022 Author Report Share Posted April 10, 2022 Paper? Books? What is this paper thing? Thank you White93, it was in fact pin 34 and there is continuity. kind of a shame now I have to replace the sensor. Looks like removing a trans to block bracket and modifying a 22mm socket. Im curious as to what the GM procedure would be on this job. Probably the same but with a J-tool. Quote Link to comment Share on other sites More sharing options...
55trucker Posted April 10, 2022 Report Share Posted April 10, 2022 (edited) 2 hours ago, Blue02GPGT said: Paper? Books? What is this paper thing? Thank you White93, it was in fact pin 34 and there is continuity. At one time in our world when one wanted to transfer information from one to another paper is the medium that was used. In schools, newspapers, society in general, a pencil or pen was made use of to print the information on the paper. In those days we had items known as *books*, one would open the book & read it. I can certainly understand how millennials might not be able comprehend this outdated/antiquated? form of information transfer. Edited April 10, 2022 by 55trucker 94 olds vert 1 Quote Link to comment Share on other sites More sharing options...
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