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P0171 code

Discussion in '1st Gen. Tacomas (1995-2004)' started by TacomaEli, Jan 12, 2020.

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  1. Jan 14, 2020 at 7:16 PM
    #21
    IFGD

    #21
    IFGD Well-Known Member

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    You test it while it's disconnected, so it wouldn't make a difference either way.
     
    IFGD, Jan 14, 2020
    #21
  2. Jan 14, 2020 at 8:20 PM
    #22
    cruiserguy

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    cruiserguy Well-Known Member

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    Hell yeah hermano this is some good diagnostic work! Explained in a way that it clicked in my head! I appreciate you taking the time to post this up homie :D:cool:
     
    cruiserguy, Jan 14, 2020
    #22
  3. Jan 14, 2020 at 9:23 PM
    #23
    Timmah!

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    Timmah! Well-Known Member

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    A few hours would be sufficient.
     
    Timmah!, Jan 14, 2020
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  4. Jan 15, 2020 at 1:27 PM
    #24
    TacomaEli

    #24
    TacomaEli [OP] Well-Known Member

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    So today I tested the af sensor again. Here’s some pictures. Looks like it’s orignal. It read at 2 ohms this time @Timmah!
    11B4A35A-0450-40F5-8070-7C9C6F1B8B4F.jpg 55BF09DD-FE24-415D-B90D-CE73CB205D28.jpg 66D99A1F-8D41-4853-ACB1-8A55D5752F33.jpg
     
    Last edited: Jan 15, 2020
    TacomaEli, Jan 15, 2020
    #24
  5. Jan 15, 2020 at 1:49 PM
    #25
    TacomaEli

    #25
    TacomaEli [OP] Well-Known Member

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    My maf had a resistance of 1.35k ohms today. I let it cool off for about 2 hours.
     
    TacomaEli, Jan 15, 2020
    #25
  6. Jan 15, 2020 at 6:51 PM
    #26
    Timmah!

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    Timmah! Well-Known Member

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    From the ohms resistance you got on the A/F sensor and the MAF sensor, they are both outside the spec. For the A/F sensor, you should have seen a value between .8 to 1.4 ohms and you got a value of 2 which is outside the spec. For the MAF sensor, the range is 2.2k to 2.7k and you got a value of 1.35k which is also outside the spec. You probably should replace both of them.
     
    Timmah!, Jan 15, 2020
    #26
  7. Jan 15, 2020 at 7:16 PM
    #27
    TacomaEli

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    TacomaEli [OP] Well-Known Member

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    Should I try and get ahold of an obd2 scanner that reads live data and see what that tells me.
     
    TacomaEli, Jan 15, 2020
    #27
  8. Jan 15, 2020 at 9:38 PM
    #28
    Timmah!

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    Timmah! Well-Known Member

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    That wouldn't hurt. If you have an Android phone, you could use the phone app Torque Pro and get a bluetooth OBD II reader.
     
    Timmah!, Jan 15, 2020
    #28
  9. Jan 16, 2020 at 4:01 AM
    #29
    TacomaEli

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    TacomaEli [OP] Well-Known Member

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    Unfortunately I have an IPhone. I was thinking about just ordering one on Amazon or seeing what harbor freight has.
     
    TacomaEli, Jan 16, 2020
    #29
  10. Jan 16, 2020 at 6:06 AM
    #30
    Timmah!

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    Timmah! Well-Known Member

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    They have OBD II reader that work with iPhones. Do a search on Amazon. There's one called BlueDriver. It's a little pricey but the reviews are pretty positive. https://amzn.to/30o87eG
     
    Timmah!, Jan 16, 2020
    #30
  11. Jan 20, 2020 at 4:22 PM
    #31
    Dakota21601

    #31
    Dakota21601 Well-Known Member

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    I am curious as to how u know which prongs to contact when checking sensor resistance. I checked my MAF sensor and through trial and error I found a reading of 1.33 and I know its bad as it has a code as well but trying to learn what I am looking for. Most combinations got no reading and I got one w a reading in the 20s. Thanks!
     
    Dakota21601, Jan 20, 2020
    #31
  12. Jan 20, 2020 at 4:31 PM
    #32
    TacomaEli

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    TacomaEli [OP] Well-Known Member

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    @Timmah! sent the fsm pages if you scroll up
     
    TacomaEli, Jan 20, 2020
    #32
  13. Jan 20, 2020 at 5:02 PM
    #33
    Dakota21601

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    Dakota21601 Well-Known Member

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    Oh ya. I see that now. Skimmed over that before thinkin of trying. Thanks!!
     
    Dakota21601, Jan 20, 2020
    #33
  14. Jan 31, 2020 at 7:15 PM
    #34
    TacomaEli

    #34
    TacomaEli [OP] Well-Known Member

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    Ordered a MAF and it comes in tomorrow. I’ll let you know if the next few days if it fixes it.
     
    TacomaEli, Jan 31, 2020
    #34
    QMEDJoe and cruiserguy like this.
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