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Thread: AT4 - Reduced power mode / MAF failed

  1. #1
    Potential Tuner
    Join Date
    Jun 2022
    Posts
    1

    AT4 - Reduced power mode / MAF failed

    Truck was previously tuned but wanted to perfect the tune more.

    Upon inspection of the truck it was discovered that MAF was partially separated from the air box. When it was properly installed the truck began to go into reduced power mode. When logging I noticed in the "Mass air flow state" it says "Map TPS failed" then when it goes into reduced power mode it says "MAF Failed". The axle torque portion also seems off to what it is commanding. I'm not sure if its commanding to much torque causing the reduced power mode and failed MAP/TPS/MAF or if there really is some type of mechanical problem with one of those. Was also thinking its something with seeing boost.

    Its a 6.2L with a whipple supercharger.

    If someone can review the logs and tune and point me in the right direction it be highly appreciated. One log is just idling and the other is driving and then goes into reduced power mode.

    Thank you!
    Attached Files Attached Files

  2. #2
    Tuner in Training
    Join Date
    May 2021
    Posts
    12
    Is the tune you attached the one you are running after it was first tuned? It is a stock AT4.