Cam and crank sensor issue on cat motor
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cam Roberts, Jan 13, 2019.
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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.
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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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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.spsauerland Thanks this.
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Cool,just remember injectors are 90 volt. Post your results.
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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.Attached Files:
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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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