PCM wiring diagram for 1995 for knock sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-23-2009, 09:45 PM   #1
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Default PCM wiring diagram for 1995 for knock sensor

I am looking for the PCM wiring diagram for a 1995 - I am trying to figure out which wire goes to the knock sensor. I am getting the P0325 code, and there is no voltage at the wire at the knock sensor - instead the wire produces a good ground when checked. I am thinking there is a short somewhere, but would like to do a continuity check at the PCM. Any one able to help me identify the knock wire at the PCM harness under the dash?

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Old 08-23-2009, 11:05 PM   #2
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There is a dark blue wire called "knock sensor in" heading from the PCM into the knock sensor. If your circuit is having problems, there should be a gray wire (#12) which is your PCM'* 5 volt reference, leading to the throttle position sensor; also check that.

Source: the Haynes manual (which covers Buick, Oldsmobile, and Pontiac C- and H-body FWD vehicles, 1985-2005 -- including our precious Bonnies and your Buick LeSabre)
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Old 08-24-2009, 11:47 PM   #3
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Thank you. Will give it a look in the morning.
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Old 08-29-2009, 11:43 AM   #4
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There are 4 or 5 dark blue wires going into the PCM harnesses. I am not sure I can isolate which is the knock sensor without removing the PCM.
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