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Thread: P0546 EGT fault

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    NitroFish300's Avatar
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    P0546 EGT fault

    ok so im going crazy trying to figure this PITA out, swapped sensors, checked for shorts from harness to to sensor going as far as removing the connector and wiring to the sensor, checked all grounds still no luck! hits 117F and defaults to -240F and throws the code.
    Any other ideas

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    DR2006RXP's Avatar
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    P0546 EGT fault

    Maybe bad ecu out , is this a factory 300 or tuned ?

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    NitroFish300's Avatar
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    Reflashed but didn't start till July of last year

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    DR2006RXP's Avatar
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    Quote Originally Posted by NitroFish300 View Post
    Reflashed but didn't start till July of last year
    Is it a maptunner reflash or you sent out the ecu ?

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    NitroFish300's Avatar
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    MapTunerX sir


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    DR2006RXP's Avatar
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    Quote Originally Posted by NitroFish300 View Post
    MapTunerX sir
    You got spare ecu you can test ??? You did the basic , replaced sensor and check both lines from egt connector to ecu terminal , only one last item on the list , test ecu.

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    NitroFish300's Avatar
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    Unfortunately I don't have a spare ECU I did try reflahing back to stock still no luck. Yeap checked wiring looks good, even hard wires the EGT sensor

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    DR2006RXP's Avatar
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    Sounds like ecu

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    DR2006RXP's Avatar
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    Ohm the 2 pins on the ecu related to the egt see what you get .

  10. #10
    NitroFish300's Avatar
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    Shouldn't checking the ohams at the wires at the EGT give the same results as testing the pins on the ECU? Sorry I'm no electrion by any means if I'm way off

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