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Thread: how to detect a faulty crank position sensor??

  1. #1
    Join Date
    Dec 2008
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    melbourne
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    416

    how to detect a faulty crank position sensor??

    As the heading asks, does anyone know how to detect a faulty crank position sensor?

    cheers
    bronson

  2. #2
    Join Date
    Aug 2006
    Location
    Perth Wa
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    24,463
    with a nanocom or similar it will come up with a one of a couple of fault codes.

    without.

    the engine wont start even though all other aspects prove ok.

    you can test them with a mulitmeter when you crank the engine over by disconnecting it, setting the meter to freq count and then hooking up over the sensor while you crank the engine.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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    Fozzy, 2.25D SIII Ex DCA Ute
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  3. #3
    Join Date
    Dec 2008
    Location
    melbourne
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    416
    Quote Originally Posted by Blknight.aus View Post
    with a nanocom or similar it will come up with a one of a couple of fault codes.

    without.

    the engine wont start even though all other aspects prove ok.

    you can test them with a mulitmeter when you crank the engine over by disconnecting it, setting the meter to freq count and then hooking up over the sensor while you crank the engine.
    What does the Nanocom come up with?

    cheers bronson

  4. #4
    Join Date
    Feb 2004
    Location
    Williams West Aust
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    20,661
    Mine constatly comes up with "noisy crank signal"
    Replacing the sensor did nothing to fix it,at least there is a spare sensor in the console if it does fail.
    I think my wiring is damaged as the oil pressure sensor that is on the same lead to the loom doesnt work.
    Andrew
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  5. #5
    Join Date
    Aug 2006
    Location
    Perth Wa
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    24,463
    noisey crank sensor has a few causes

    1. arcing from the stater motor contacts on startup
    2. earth fault (like you couldnt guess that on a landy)
    3. damaged loom
    4. dirty sensor/flywheel
    5. sensor not installed correctly.


    if you clear the codes on the fly with the engine running and it doesnt come back till you shutdown and restart then your dealing with the first 2. if it comes back at random or as soon as you've cleared it any of the last 4.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    TDI D1(its responded well to its lecture about poor performance)

    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  6. #6
    Hi there was a tech bulliton from l/r on noisey crank signal on td5 it was to fit a spacer plate on the sensor

  7. #7
    Join Date
    Aug 2013
    Location
    Lake Macquarie
    Posts
    47
    Bringing up an old post but having issues...

    Vehicle is showing all the signs of crank ankle sensor fault however when I plug in the nanocom and also another diagnostic tool in no faults appear... Any ideas?

  8. #8
    Join Date
    Feb 2009
    Location
    Moe
    Posts
    938
    I haven't had a problem personally, but I recall posts where problem starts off intermittent. Bad when hot, good when cold. Pouring cold water on a hot sensor can make it come good for a while. As such it's not surprising thati the Nanocom isn't registering a fault.
    2002 D2 V8 Auto SLS+2" ACE CDL Truetrac(F) Detroit(R) Nanocom

  9. #9
    Join Date
    Aug 2013
    Location
    Lake Macquarie
    Posts
    47
    Thanks that sounds about right! I think I will chuck a new sensor in and have a good look over the wiring while I'm at it

    Bryco

  10. #10
    Join Date
    Aug 2013
    Location
    Lake Macquarie
    Posts
    47
    Yep new sensor sorted the problem! Nearly fell over when I had to pay for the part though! Genuine at retail was over $400!

    Bryco

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