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Yes another p0325 post

Discussion in '1st Gen. Tacomas (1995-2004)' started by M90polk, Oct 15, 2022.

  1. Oct 15, 2022 at 10:57 AM
    #1
    M90polk

    M90polk [OP] New Member

    Joined:
    Oct 15, 2022
    Member:
    #408077
    Messages:
    2
    Would like to say hello to everyone on this forum this is my first post here.
    I have searched through the forum for my issue an no luck. I have a 95 tacoma 2.4l 5 speed.
    Truck had a code come up which is p0325, Knock sensor circuit fault. First thing I did was check resistance of original sensor and it was bad so I replaced it with a new aftermarket one. Drove a mile and code came right back, checked the wiring and there is no continuity to ground. Wiring seemed good but just to check I ran a new wire from ecu to sensor but code came right back. At this point I swapped in a known good ecu and code again came right back.
    I have changed the distributor rotor, new plug wires and cleaned the maf sensor all of which were bad. Truck runs fine parked but under slight load when driving light will come right back on. Live data at idle is also attached. Some insight would be appreciated!

    IMG_20221015_125011.jpg
     
  2. Oct 17, 2022 at 4:44 PM
    #2
    M90polk

    M90polk [OP] New Member

    Joined:
    Oct 15, 2022
    Member:
    #408077
    Messages:
    2
    Great news, the replacement sensor was bad. Even though the resistance check was good per Toyota test procedure and it had a proper signal with oscilloscope. The internal piezoelectric sensing must have been the incorrect range making it overly sensitive. This was causing ignition advance for cylinder 1 to go to 34° btdc under any load (pictured). So just to let everyone know in case this randomly happens to someone else.

    IMG_20221015_124750.jpg
     

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