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Antiknock CPU

Discussion in 'Technical Chat' started by 876653289, Dec 1, 2009.

  1. Dec 1, 2009 at 7:52 AM
    #1
    876653289

    876653289 [OP] New Member

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    K&N intake, airaid throttle spacer
    I keep getting an engine light and when checked it comes up as code P1605Knock Control CPU Malfunction
    Can anybody tell me more about this. Most tell me its a knock sensor but it looks like that should be a seperate code for each knock sensor since this engine has 2 of them.
     
  2. Dec 1, 2009 at 8:11 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
    Tenoe, AZ
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    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    I dont have any experiance with that, but bump for someone else who may know....
     
  3. Dec 1, 2009 at 8:35 PM
    #3
    kevhogaz

    kevhogaz Low Speed, High Drag

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    Queen Creek, Arizona
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    Oh boy, that's a bad one. The flow chart goes like this:

    DTC P1605; Engine Control Computer Malfunction (for knock control)
    Trouble Area - ECM

    Are there any other codes present?

    NO? Replace ECM
    YES? Go to relevant DTC chart

    So, if there are no other codes along with the P1605, you need a new ECM (computer)
     
  4. Dec 1, 2009 at 8:50 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    :eek: Good to know! Thanks Kev!
     
  5. Dec 2, 2009 at 5:30 AM
    #5
    kevhogaz

    kevhogaz Low Speed, High Drag

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    Queen Creek, Arizona
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    SR5 PreRunner
    3" lift front & rear, Air Raid Intake System
    I hated to even post the answer to his problem, because it was an expensive one to fix.

    I'd look for a used one first, then go to the dealer second.
     
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