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Troubleshooting ECU codes

Discussion in '2nd Gen. Tacomas (2005-2015)' started by lmvaughan, Apr 19, 2021.

  1. Apr 19, 2021 at 1:15 PM
    #1
    lmvaughan

    lmvaughan [OP] Well-Known Member

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    Hey Everyone,

    I recently installed a hewitt tech secondary air injector removal kit with the 2 pressure sensors that removed the air valves in my 2014 4.0L tacoma. I also have a URD supercharger kit installed. My truck is shifting extremely hard and it rocks back when it shifts gears, I'm trying to troubleshoot what the problem could be. I talked to URD and gadget said it was most likely the hewitt kit interfering with the UCON self tuning ECU they provided.

    I contacted Hewitt and they gave me a list of the codes that the kit changes, Gadget mentioned it was most likely caused by a MAF code change that the Hewitt cpu was changing.

    Here are all the pressure sensor codes the Hewitt kit changes
    P2431 - Air Flow / Pressure Sensor Circuit Range / Performance Bank1
    P2432 - Air Flow / Pressure Sensor Circuit Low Bank 1
    P2433 - Air Flow / Pressure Sensor Circuit High Bank 1
    P2436 - Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
    P2437 - Air Flow / Pressure Sensor Circuit Low Bank 2
    P2438 - Air Flow / Pressure Sensor Circuit High Bank 2
    P106B - Pressure Sensor Correlation / Evap. Pressure Sensor

    Would any of these cause the truck to jolt when shifting gears?
    Obviously this is for offroad use only
    Thanks!
     
  2. Apr 19, 2021 at 4:08 PM
    #2
    Torspd

    Torspd Tor-nication

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    Have you removed the Hewitt for testing, to see if the codes go away?
     
    BassAckwards likes this.
  3. Apr 19, 2021 at 4:26 PM
    #3
    lmvaughan

    lmvaughan [OP] Well-Known Member

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    These are the codes the Hewitt tech manipulates/disabled. I took the kit off and my car shifts fine. I have no codes thrown after checking my obd port with a scanner
     
  4. Apr 19, 2021 at 4:28 PM
    #4
    BassAckwards

    BassAckwards Well-Known Member

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    Full-time AWD & BorgWarner EFR 6258
    If you run HP tuners you can have your stock ECU flashed to remove the sai and then you can run that ECU with the UCon without any issues (Then just remove the hewitt stuff). I ran my UCon with an HP tuned ECU for a while just to get rid of the SAI
     
    Last edited: Apr 19, 2021
    TnShooter, Torspd and lmvaughan[OP] like this.
  5. Apr 19, 2021 at 4:58 PM
    #5
    lmvaughan

    lmvaughan [OP] Well-Known Member

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    yeah, that's my back up plan, it's just I already dropped $800 on this crap so kinda wanted to make it work lol
     
    BassAckwards[QUOTED] likes this.

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