Cam and crank sensor issue on cat motor

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cam Roberts, Jan 13, 2019.

  1. Pinkybuster

    Pinkybuster Bobtail Member

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    Feb 19, 2020
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    He put oil on it ...
     
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  3. Gd5661

    Gd5661 Bobtail Member

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    Aug 12, 2020
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    Last edited: Aug 12, 2020
  4. Gd5661

    Gd5661 Bobtail Member

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    Aug 12, 2020
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    Is this Pico screen shot an actual C12 crank sensor waveform? Do you recall if this screen shot was taken at idle, or cranking? I may have a similar problem with my C10 3CS002.
     
  5. spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    No it is not actual waveform from C12. The crank sensor uses the crank gear teeth as the pulse wheel. One tooth is partially missing so ECM can pickup TDC on #1. This allows engine to run with only one sensor unlike the older single sensor design. Most issues I have had on the C12 has been rubbing wires close to the oil pan standoff bracket.
     
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  6. Gd5661

    Gd5661 Bobtail Member

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    Aug 12, 2020
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    Thanks for the reply. This truck is on a job-site. Im going to connect a 4 channel digital scope and record cam, crank, injector 1 & 2 to try and get a base line recording for future reference. The best way I found to check for intermittent open/shorted circuits, is to disconnect both ends of the cable (computer and sensor) and Megger test the cable. Yes, the issue is usually near the cable clamp.
     
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  7. spsauerland

    spsauerland Road Train Member

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    Cool,just remember injectors are 90 volt. Post your results.
     
  8. Gd5661

    Gd5661 Bobtail Member

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    Aug 12, 2020
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    Will do!
     
    spsauerland Thanks this.
  9. blacklabel

    blacklabel Heavy Load Member

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    Nov 6, 2011
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    Serious question...

    What different crank speed sensors fit a C12/10? apparently the front inner timing covers are basically the same but mine are the crank sensor because it was to long. Cover is stamped 1382008 B 4. I'm waiting for a picture of the one that came off it probably be tomorrow.
     

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  10. Tama Mai Hawaii Nei

    Tama Mai Hawaii Nei Light Load Member

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    Sep 6, 2013
    Las Vegas, NV
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    Did you figure out what was going on? My c13 is doing this for a split second sound like its gonna stall gets to 300 rpms then runs fine
     
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