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Thread: 03 TJ. Error code P1494

  1. #1
    millertime threejeeps's Avatar
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    Default 03 TJ. Error code P1494

    Just got this error code with the check engine light:

    P1494 (M), Leak Detection Pump Sw or Mechanical Fault, Incorrect input state detected for the Leak Detection Pump (LDP) pressure switch.

    Just want some input on what could be causing this. Thanks!!

  2. #2
    I am a chapter of one sincitycj's Avatar
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    Default

    From what I can find in the FSM, the LDP is part of the evap system. It is connected to your canister and does have a remote filter. You may want to remove and clean that filter, also check your gas cap. If the gasket is cracked or worn, or if the cap was just left loose, it will cause a leak in your evap system causing the check engine light to come on. Check those and clear the code and see what happens. There is a testing procedure in the fsm but I haven't found it yet.
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  3. #3
    millertime threejeeps's Avatar
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    Default

    Thanks for the help!

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