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2nd Gen Tacoma P0171, P0174

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Mikechanic, Nov 22, 2023.

  1. Nov 22, 2023 at 1:08 PM
    #1
    Mikechanic

    #1
    Mikechanic [OP] New Member

    Joined:
    Nov 22, 2023
    Member:
    #438009
    Messages:
    1
    I’ve read a few posts online and video talking about this and wanted to share my info for anyone looking for it.
    I had P0171 and P0174. Bank 1 and 2 system lean. My fuel trims were around +30. No hesitation, drivability or starting problems.

    No obvious vacuum leaks (didnt smoke test)
    Cleaned MAF sensor and swapped the one from my Corolla (same part #) fuel trims stayed in the 30’s.

    Bypassed the low speed fuel pump resistor and fuel trims immediately dropped to 9% which isnt great but good.
    The resistor sends less power to the fuel pump at idle which causes the pump to run at a slower speed. Bypassing it gives full power at all times.

    Ordered a fuel pump and swapped it out today. The old one looked in great condition for a 200k mile truck but the strainer at the bottom of the pump was black and clogged which was causing the lean condition. After replacing the pump the fuel trims are now 0 - 1%.

    Tacoma Check Engine Light P0171 P0174 Lean
     
    Mikechanic, Nov 22, 2023
    #1
    CarrollTaco2010, jktx1, wi_taco and 1 other person like this.

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