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2001 throwing p0325 code

Discussion in '1st Gen. Tacomas (1995-2004)' started by Oxnfox, Apr 21, 2022.

  1. Apr 21, 2022 at 11:41 AM
    #1
    Oxnfox

    Oxnfox [OP] Member

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    My Tacoma is throwing the p0325 code.

    I do not notice any difference in performance tho. I have read that this code can throw the truck into limp mode but I haven’t experienced anything of the sort yet. I have read how much of a hassle this is to replace harness and sensors but wanted to get some more feedback from you guys before I jump the gun on this


    Also if anyone can list all the parts I’ll need to do this job right that would be helpful
     
    Last edited: Apr 21, 2022
  2. Apr 21, 2022 at 1:19 PM
    #2
    JudoJohn

    JudoJohn Well-Known Member

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    Check your knock sensor.
     
  3. Apr 21, 2022 at 1:36 PM
    #3
    Oxnfox

    Oxnfox [OP] Member

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    Yes I’m aware the code is for the knock sensor
     
  4. Apr 21, 2022 at 1:47 PM
    #4
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    ... Yes, but what he is saying is: Get an FSM (you can easily find a link to a pdf digital copy on here or elsewhere) and follow the steps within that to inspect the knock sensor.

    Yes- it's work. If you don't like it, I'm sure you can find a mechanic to take your money.
     
  5. Apr 21, 2022 at 1:50 PM
    #5
    Oxnfox

    Oxnfox [OP] Member

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    Wouldn’t the engine be running quite poorly if it was indeed a faulty knock sensor? Because the engine seems to be running fine
     
  6. Apr 21, 2022 at 1:54 PM
    #6
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    The knock sensor is detecting if something is going wrong in the process. A faulty sensor is not going to cause a knock - a faulty sensor would just report bad data to the ecu.
     
  7. Apr 21, 2022 at 2:35 PM
    #7
    Oxnfox

    Oxnfox [OP] Member

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    Ok. Could you help to list all the parts other than sensor/harness I would need to replace sensors and wiring harness
    Like what gaskets or sealer or any thing else I need for this job?

    Can you confirm these are correct parts needed

    82219-0C010 - wire sensor
    17176-0P010 - Air Surge Gasket
    17177-AD010 - Intake Manifold Gasket
    17178-AD010 - Intake Manifold Gasket
    16341-AD010 - Water out Gasket (two ofthese)
    96761-35031 - O-ring (two of these)
    00272-SLLC2 - Super Long Life Coolant
     
    Last edited: Apr 21, 2022
  8. Apr 21, 2022 at 2:49 PM
    #8
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    I think most folks here are willing to help guide you, but I'm certainly not going to do your homework for you.

    Did you find a copy of the FSM? It details exactly what you need to remove (and replace) to inspect the knock sensor. Although it does mention that you need to drain the coolant, I think you can get away without that.

    At a minimum, you'll need to remove the throttle body and upper and lower intake manifolds (if you have a v6- you never mentioned what engine you have). So throttle body, and two intake gaskets.

    You really should take your time and use the part diagrams and FSM to understand this job before hoping that someone will just spoon-feed you.

    You can check out some of the Timmy The Toolman videos- specifically, either the valve gasket replacement or fuel injector replacement, do see detailed teardowns on the throttle body and intake.
     
  9. Apr 21, 2022 at 3:01 PM
    #9
    CodeSeven

    CodeSeven LOC: 33.781461, -115.867251

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    is there coolant running through the intake manifold?
     
  10. Apr 21, 2022 at 3:02 PM
    #10
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    Through the IAC (when you remove the TB).
     
  11. Apr 21, 2022 at 3:08 PM
    #11
    CodeSeven

    CodeSeven LOC: 33.781461, -115.867251

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    You sure? Many intake manifolds will pass coolant from one head to the other. I don't want the OP to take off his manifold and get coolant everywhere.
     
  12. Apr 21, 2022 at 3:15 PM
    #12
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    Very sure. Outside of my personal experience having removed the intake manifolds on a handful of Tacomas, here are the relevant FSM diagrams and call-outs.

    Edit - I'll add, that I don't think that removing them or draining fluid is necessary.

    upload_2022-4-21_15-11-33.jpg
    upload_2022-4-21_15-13-5.jpg
    upload_2022-4-21_15-15-8.jpg
     
    Last edited: Apr 21, 2022
    CodeSeven[QUOTED] likes this.
  13. Apr 21, 2022 at 3:15 PM
    #13
    CodeSeven

    CodeSeven LOC: 33.781461, -115.867251

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    What engine do you have? You'll want to think about the fuel rail while you're down there. You have to remove it before the intake. There are 6 12mm aluminum crush washers for the fuel rails. Also, the injector caps might stick to the intake ports and you'll have to break them to get 'em out. They easily slip out of the fuel rail. Might want to get orings for the injectors too
     
  14. Apr 21, 2022 at 3:29 PM
    #14
    Oxnfox

    Oxnfox [OP] Member

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    I have the v6
     
  15. Apr 21, 2022 at 5:09 PM
    #15
    Dirty Pool

    Dirty Pool FLIES ON THE FRIES, KETCHUPS WATERED DOWN

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    Knock sensors/harness exposed after all 3 sections of the intake are removed. Note the open coolant passages @CodeSeven mentioned (rectangles) .
    In most cases it's the harness/connectors that have deteriorated from heat. While in there it would be silly to not reseal the "water bypass tube", the two bolt connection to the block. It just uses coolant rated RTV sealant, no gasket or o-ring. Also the perfect time to check valve clearance.
    [​IMG]
     
    CodeSeven and Andy01DblCabTacoma like this.
  16. Apr 21, 2022 at 9:31 PM
    #16
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    @Dirty Pool Thanks for the additional info. I incorrectly assumed that the knock sensors were accessible without removing the 3rd portion of the intake manifold.
     
  17. May 2, 2022 at 7:01 PM
    #17
    1ChancetooLate

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    2003 3.4L obviously v6. Have had several issues with a P0420 and now a P0325. Had timing belt done not long ago due to sounds or bearing going out on pump or belt tensioner. Can the knock sensor loom get in the way and pinched during the timing belt job? Also, P0420 code. What's the proper running volts on both O2 sensor? Please dear God tell me someone can truly state the range or operative voltage... Bench tested the O2 sensors and have tried multiple methods of proving them bad. What's the deal with these things?
     
  18. May 2, 2022 at 8:58 PM
    #18
    Andy01DblCabTacoma

    Andy01DblCabTacoma Well-Known Member

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    I think you should open your own thread.

    You have a different issue than the OP on this thread.

    The proper specs for the O2 sensors are in the FSM. You can find a digital copy fairly easily. The "deal with these things" is- get Denso / OEM sensors- you're just throwing money way otherwise.
     
  19. May 2, 2022 at 9:57 PM
    #19
    Dm93

    Dm93 Test Don't Guess

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    Not sure about the knock sensor harness, I wouldn't think so as the intake doesn't have to come off to do the timing belt.

    AFR (upstream) sensor voltage is calculated within the PCM but in OE scan data it should fluctuate between 3.1 and 3.5V, lower voltage is rich, higher voltage is lean (in generic scan data it may display as a standard O2 sensor (0-1V)).
    The downstream sensor operating range is 0-1v (below 0.5v is lean, above 0.5v is rich) but if the catyletic converter is functioning properly and warmed up it should remain at a pretty stable voltage on the rich side >0.5v.
    If the downstream is switching (rich/lean) near the same rate as the upstream you either have an exhaust leak near or upstream of the sensor or the converter is no longer functioning properly and you will get a P0420.
    1st gen AFR Sensor Operation.jpg
     
    Last edited: May 2, 2022
  20. May 3, 2022 at 6:57 PM
    #20
    1ChancetooLate

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    Dm93, thanks a bunch. Been asking for that exact data.!.!
    Andy01DblCabTacoma, unsure what an "fsm" is. Would love better detail then simple a acronym for a term or object. Also unfamiliar with my own thread?.?. I don't really think I have ever joined an online group or forum so I am unaware of lingo and proper usages. Sorry if I have made an erroneous mistake.
     

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